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 Post subject: Pester Power Works .... 750 on the way back
PostPosted: Sat Jul 11, 2015 12:54 pm 
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Joined: Thu Jul 09, 2015 8:23 am
Posts: 8
Location: UK
model: 750 Sport
year: 1989
I've had a 750 sport sat under wraps for what has to be 7 or 8 years . Sadly at one point (long story) a small amount of water got into the Weber carb or so it seems through it and sat in the front head ... (due to long story) I wasn't aware of this until my first born Jaz turned on the pester power and decided she liked the look,could fit on it ...well just and the dad can I have ? dad can I have ? routine started ... and that's why its now now hers .. so a few days ago it was dragged into the sunshine and work has began ....
I decided to take the carb off for a clean up and also as the throttle cable wouldn't pull .... Unfortunately this first problem was discovered followed quickly by the second .

The spindle which the butterfly (choke) flaps are on was very seized .... It took an overnight soak followed by about an hour of very gentle working before it started to move and I'm pleased to say is now 100% . Thankfully the rest of the carb is in very good order.

The more serious problem came to light with the carb removed and the head taken off .... I should add that the Barrel and Piston have escaped without any problems and are very clean and un-damaged.

Next task is to strip the head and commence sorting ... It seems more likely that only a small amount of water got in so at present I hope it just a case of a valve regrind and shim .

During all the excitement I remembered why the bike had been left so long in the first place ... The gear-change had got progressively worse and vague and at the time (when I had no time) the bike was just covered and forgot .

So as a precaution Jaz and I have already checked the clutch plates which seem fine and in spec .... The fault as I'm sure most of you will say was in the two swivels on the gear pedal rod ie both ends ... very very stiff .... so I guess the gear change couldn't return ...which is now sorted

I should add Jaz is my daughter who was born on the Isle of Man.... is as mad as a 'box of frogs' and studying for her 'Masters in Vehicle Engineering' very good with electronics and gear ratios .... Now learning the spanners !!
She refers to herself as my son ...probably true as my real son wears his hat the wrong way round , can only make grunting noises when questioned and thinks a noisy Nissan Micra is the height of cool !

Will sort the photo's out soon as I can and give an update ..... Looking for an airbox cover (don't ask) and tank fastenings ...

Parts need so far :

Base gaskets and oil seals
Airbox cover
Belts
Tank fastenings
Handlebar Grips
Tyres
Chain n Sprockets

All the Best

Dale/Jaz


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 Post subject: Re: Pester Power Works .... 750 on the way back
PostPosted: Sun Jul 12, 2015 12:40 am 
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paso grand pooh-bah
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Joined: Sat Sep 03, 2005 12:00 am
Posts: 1307
Location: SF Bay Area
model: 750 Sport
year: 1990
hawthornallen wrote:
Parts need so far :

Base gaskets and oil seals
Airbox cover
Belts
Tank fastenings
Handlebar Grips
Tyres
Chain n Sprockets

All the Best

Dale/Jaz


Dale/Jaz,
A great family endeavor to be sure.
Airbox cover - Same as Paso I believe.
Belts - buy new. Same as pantah and Paso - readily available.
Tank fastenings - The front and rear are odd bits, and involve odd shouldered bolts and rubber bits. Best off making something that fits from the hardware store and/or RTV silicone. The rubber bumpers on the sides are available from Bevel Heaven, and same as old bevel drive bikes. http://www.bevelheaven.com
Grips - same as any motorcycle - go to a local shop and buy what every you fancy.
Tires - The Golden Tire / Shinko tire is your only/best option. Search this forum for more info.
Chain and Sprockets - Chain is standard. Get a good o-ring chain. The rear sprocket is common with the Paso and some Pantah bikes. The front may be easy, or very difficult. Post a picture of what you have. There seems to be some different versions.

Cheers, Phil

_________________
Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.


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 Post subject: Re: Pester Power Works .... 750 on the way back
PostPosted: Sun Jul 12, 2015 8:34 am 
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Joined: Thu Jul 09, 2015 8:23 am
Posts: 8
Location: UK
model: 750 Sport
year: 1989
Hopefully have manged to add a few pics .... sorry for the non Duc pic . We built the Rvf from the frame up ... This bike now lives in Holland .
It would appear the collecting bug has been handed over ... however the buying in the first place hasnt.

Dale/Jaz


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 Post subject: Re: Pester Power Works .... 750 on the way back
PostPosted: Sun Jul 12, 2015 10:16 am 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5085
Location: southern Germany
model: 750 Paso
year: 1987
Hey you two,
Quote:
The spindle which the butterfly (choke) flaps are on was very seized

Hopefully these were just the areas where the spindle goes through the carb housing and not the bearings. In case you need to replace them use "607 RS". These are sealed bearings which will also reduce the risk of leak air issues.

About the shifting problem also check:
viewtopic.php?f=1&t=7176
As the clutch cover is off check if the bearing in the piston still runs smooth, then pop out the piston and clean it and the cylinder. It`ll probably need that after years of storage.

If Jaz is good with electrics she should go through the whole wiring and check/implement the wiring mod that you can find in the FAQs.

Quote:
Airbox cover - Same as Paso I believe.

it`s #24610011A same as 906, 907ie, 888. The one of the P750 is #037095640 and the shape is minimally different but I guess it would fit as well. If you can`t find one contact Rudy ducaparts@motofun.nl in the Netherlands. He deals with used Duc parts specially from the 80s models.

G.


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 Post subject: Re: Pester Power Works .... 750 on the way back
PostPosted: Sun Jul 12, 2015 10:46 am 
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Joined: Mon Dec 15, 2014 11:05 am
Posts: 92
Location: Sleepy leafy South Birmingham UK
model: 750 Paso
year: 1987
A great story and welcome to the forum Dale.

Keep us posted on progress :thumbup:

_________________
2004 ST4S
2001 ST4
1987 Paso 750


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 Post subject: Re: Pester Power Works .... 750 on the way back
PostPosted: Mon Jul 13, 2015 8:32 pm 
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Joined: Thu Jul 09, 2015 8:23 am
Posts: 8
Location: UK
model: 750 Sport
year: 1989
Thanks all for the advice .... Much searching has been done and thankfully the two fairing sides ...the seat base and seat have all been found ... parts which are still lost are the keys !!! which still should turn plus the fairing and seat bolts ,tho the bolts which fix the single seat cover are there.

Any advice or thoughts on the following welcomed :

I will strip n clean the clutch slave cylinder as advised but are there any known fixes for what seems a heavy clutch .... bearing in mind Jaz argues ferociously she is over 5' but really she's a bit tiddly .... so whilst dog leg levers will help the reach my only though is to up the master cylinder ?

The front sprocket has a single bolt fixing... I,m guessing tighten to FT and loctite this or lock-wire the bolt to the sprocket .

No joy with the air-box yet so looking at the K&N option

Anyone used Dzus fixings on the fairing and if so what length

Will post a few more pics tomorrow

All The Best

Dale/Jaz


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 Post subject: Re: Pester Power Works .... 750 on the way back
PostPosted: Tue Jul 14, 2015 4:54 am 
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paso grand pooh-bah
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Joined: Sat Sep 03, 2005 12:00 am
Posts: 1307
Location: SF Bay Area
model: 750 Sport
year: 1990
hawthornallen wrote:
Thanks all for the advice ....

The front sprocket has a single bolt fixing... I,m guessing tighten to FT and loctite this or lock-wire the bolt to the sprocket .

Anyone used Dzus fixings on the fairing and if so what length

Dale/Jaz


Front sprocket of that kind has a very special shoulder bolt and washer. Bolt should be tight to the output shaft, but not press hard on the sprocket. The sprocket should have just a little bit of free play when the bolt is tight. Otherwise, the motion of the sprocket will undo the bolt and it will all fall off. I made a custom bushing on the bolt, and used a wave washer under a thick washer. Definitely use Loctite. (I learned from experience on this one, but caught it before it all came apart)

I have tried to find a good way to use Dzus on the Sport but have not found a way. I have a small bin full of different types, and have done it to my ST2 and ST4s. There aren't too many bolts on the Sport, and it all comes off and on easy enough. Its a bunch of engineering work with little payback. but if Jaz is creative, maybe she can dream up something that I didn't see. Some of the best inventions are simply because someone didn't know that it was difficult, or "didn't know any better" .

Cheers, Phil

_________________
Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.


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 Post subject: Re: Pester Power Works .... 750 on the way back
PostPosted: Wed Jul 15, 2015 8:41 pm 
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Joined: Thu Jul 09, 2015 8:23 am
Posts: 8
Location: UK
model: 750 Sport
year: 1989
Just a bit of an update and another question ... when the front barrel was taken off the top of the piston all but wiped clean however if you look at the side shot on the indented part of the piston its black ? easily scratched ...can only think its over-spray from when perhaps the previous owner threw paint around ? ... the front and back of the piston are clean,the rings free and no obvious blow by exists in places I would think usual ....

The picture of the head shows how grim things are .... have now cleaned the valve up and the section where it was originally ground in has appeared through the crud .... the seat itself looks ok ... Wondering if valve wasn't closing properly or not being closed ... so a re-shim is in order .

Other than that had a good look round the brake hoses look to have been new just prior to me getting the bike ... no flex at all when the the lever is pulled but I will as a minimum change the fluid .

Should have the gaskets and belts arrive next day or so ...then the fun starts ! And the pestering will go up a gear or three !


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 Post subject: Re: Pester Power Works .... 750 on the way back
PostPosted: Wed Jul 15, 2015 11:08 pm 
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Joined: Mon Dec 15, 2014 11:05 am
Posts: 92
Location: Sleepy leafy South Birmingham UK
model: 750 Paso
year: 1987
hawthornallen wrote:
Any advice or thoughts on the following welcomed :

I will strip n clean the clutch slave cylinder as advised but are there any known fixes for what seems a heavy clutch .... bearing in mind Jaz argues ferociously she is over 5' but really she's a bit tiddly .... so whilst dog leg levers will help the reach my only though is to up the master cylinder ?
Try running the clutch with 4 springs in it instead of 6. It's so easy to try.
I went to France on my ST4s in May with 3 springs in it while I was bedding in a new clutch, and upped that to 4 springs around half way through the holiday.

_________________
2004 ST4S
2001 ST4
1987 Paso 750


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 Post subject: Re: Pester Power Works .... 750 on the way back
PostPosted: Thu Jul 16, 2015 3:45 pm 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5085
Location: southern Germany
model: 750 Paso
year: 1987
Quote:
however if you look at the side shot on the indented part of the piston its black ? easily scratched ...can only think its over-spray from when perhaps the previous owner threw paint around ?

that`s carbon build up/oil crud. Quite typical on engines that run rich or have ignition problems or are just run occassionally or ridden mostly short distances (w/o load)

Quote:
Other than that had a good look round the brake hoses look to have been new just prior to me getting the bike ...

You had the bike stored 7-8 years and I guess you`ve ridden it for a while before that so the brake lines probably are 10+ years old. Even if they look good and don`t need to be replaced now I`d get steel braided brake lines sometime in the future.

Do the clutch basket or core have chatter marks. That could make clutch operation hard. Also was the pressure plate removed and the pin on its backside checked? There was a topic a while ago where this pin was either broken or stuck. Can`t remember ...


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 Post subject: Re: Pester Power Works .... 750 on the way back
PostPosted: Sun Jul 19, 2015 11:17 am 
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Joined: Thu Jul 09, 2015 8:23 am
Posts: 8
Location: UK
model: 750 Sport
year: 1989
Thanks for the thoughts and the air box cover offer (will be in touch ) ... I will replace the brake lines ,the clutch plates looked ok ... tho on reflection will take them out again and give them a light sanding ... Jaz is just on full 'bother bother' mode and working back at Frankie n Bennies (restaurant) to earn money whilst back from Uni and I should add pay for the parts for the bike ... I sometimes think i'm being a bit mean tho suppose to give her this Duc on top of the RVF and little Sr125 she has gathered fro me so far is a whole lot more than I got from my Dad .... can't take it with you !

The update is that have re ground and cleaned the valves in the front head and now wait for the gaskets and valve stem oil seals to fit it back up .... I do have quite a few parts that were gathered up from a 600 Pantah motor .... (are they same as for the 750 /Paso lump) ... I've got rockers .. shims .. spindles ... etc etc ... haven't looked that close yet but guessing they will be ... so anybody short get in touch .Hopefully might have the shims if needed !

Have taken a few pics which I will post up later ..... Will be taking rear head off tomorrow ...judging by the state of the valves and head a de-coke will be over due anyway . So for now ...

All the Best Dale/Jaz ....


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 Post subject: Re: Pester Power Works .... 750 on the way back
PostPosted: Fri Jul 24, 2015 6:57 pm 
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Joined: Thu Jul 09, 2015 8:23 am
Posts: 8
Location: UK
model: 750 Sport
year: 1989
Well Just a bit of an update .

The valve seats are looking a bit happier ... really needs new tho I reckon but as it ran before it looks a lot better now and should get it through till the summers out the way .... Jaz is looking a bit happier now things are progressing .....

We bled the brakes through though will be replacing the lines ... There marked 02/88 but really are in seemingly 1st class condition ... The big problem still seems to be on how heavy the clutch is ... All is working well tho a huge amount of crap was dug out from the master cylinder ... will pop the slave cylinder out and see if that's full of crud .
I'm more inclined to think its just a heavy clutch ... haven't yet tried taking a couple of springs out as suggested but will ... If anyone out there has fitted a smaller master cylinder or different levers ...advice welcomed.

One bit of news I've found both the air box front and its very clean/new looking Genuine air filter ... It is missing 1 horn and the clips ...better than before !

Still not found the ignition keys .. Bugger !


All the Best

Dale/Jaz


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 Post subject: Re: Pester Power Works .... 750 on the way back
PostPosted: Mon Jul 27, 2015 5:29 am 
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paso grand pooh-bah
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Joined: Sat Sep 03, 2005 12:00 am
Posts: 1307
Location: SF Bay Area
model: 750 Sport
year: 1990
It is certainly grand to have a child who is mechanically inclined, and want to work on old bikes. Of course it helps that you have a bunch of cool old bikes to play with.

Ignition switch is similar to Paso, but the streering lock bolt is a bit short, and won't lock out the steering, if that matters. (It surely didn't to me)

While you are into it, fuel lines and vacuum lines are a cheap insurance. the stock routing is recommended with the return to the tank.

I dare say that the bike is a bit older than Jaz?

CHEERS, Phil

_________________
Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.


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 Post subject: Re: Pester Power Works .... 750 on the way back
PostPosted: Wed Jul 29, 2015 7:58 pm 
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Joined: Thu Jul 09, 2015 8:23 am
Posts: 8
Location: UK
model: 750 Sport
year: 1989
Still Bloody Waiting For Parts !

Engine wise things have ground to a halt .. I've had parts,mainly gaskets and seals, on order from a Ducati dealership for getting on for 10 days ... still waiting !
Also found out today just how many Torx bolts this seems to have ,most frustrating was that having packed up a tool box with what I thought would be okay ... I then realised I couldn't take either the top yoke off or worse still get the front wheel out ... should add bikes at a friends house ... So attention turned to the rear caliper ... Took the pads out which looked new and made sure both pistons were working .. what I did find tho that one pad slid easily in and out whilst the other was quite tight .... Had a bit more of a look and realised the disc itself was slightly offset to the center line of the calipers .... Looks tho thin spacers should sit between the caliper and the hanger ? Checked the parts book which doesn't seem to show any but have to say not that fond of the old Ducati parts books ... I worked in a previous life as a Parts Manger for VW/Audi so can nprmally find myself around that sort of thing .... this is much more fun .
Only other thing we found was one of the pad retaining pins had lost its wire collet ..which we've now sorted .
So tomorrow its front wheel out and calipers off ... give them a look over then back on with new lines ..

All and any thoughts welcomed ...pics to follow

Dale/Jaz


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 Post subject: Re: Pester Power Works .... 750 on the way back
PostPosted: Wed Jul 29, 2015 8:25 pm 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5085
Location: southern Germany
model: 750 Paso
year: 1987
torx bolts on a Sport?


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