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 Post subject: Gone to the FCR Side
PostPosted: Mon Feb 25, 2019 12:55 pm 
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Joined: Sat Sep 28, 2013 6:41 pm
Posts: 8
Location: London or Ibiza
model: 750 Paso
year: 1987
I tried, I really did and in warm or even cold but dry weather my Weber was great thanks to all the advice given on here.
I didn't get to altering the pump cam as there was always a problem that would not go away in our UK climate - Freezing.

Motor starts stuttering and then you have to pull over and let the carb warm up :smoke:

I have just picked up a brace of FCR 39 for £339 :D
Super happy as was prepeared to go to £360 :cool:

They came off a 900 Monster and I am putting them on the 750 with Gio Ca Moto exhaust and very little on the front end filter front at the moment.
I already had 750SS headers and was going buy Mikuni carbs and sort the oil heating to work on the Paso but couldn't pass up FCR at the price.

Is there anything I might need to change jetting wise? From what I have read if they come stock they need jetting down anyway so hopefully I already have 155 / 200 / 60 (or this is what I have read :)
Also, what is a good filter for the front end?

Andy


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 Post subject: Re: Gone to the FCR Side
PostPosted: Mon Feb 25, 2019 4:43 pm 
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paso grand pooh-bah

Joined: Thu Jun 21, 2007 12:00 am
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Location: Gothenburg, SWEDEN
model: 907 I.E.
year: 1991
I`d contact Chris at. http://ca-cycleworks.com/contacts/ for jetting tips.
155 / 200 / 60 is for a 900.
Which manifolds?

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907 I.E. -91
M900 -97
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 Post subject: Re: Gone to the FCR Side
PostPosted: Tue Feb 26, 2019 1:40 am 
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Joined: Sat Sep 28, 2013 6:41 pm
Posts: 8
Location: London or Ibiza
model: 750 Paso
year: 1987
Hi Gert,

I had already bought a second hand pair of manifolds from a 750SS intending to fit a pair of Mikuni. They are stamped 7 on the flange so should be the correct ones :)

Will send Chris a message and see what he suggests.

Thanks, Andy


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 Post subject: Re: Gone to the FCR Side
PostPosted: Tue Feb 26, 2019 6:45 am 
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paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
Posts: 1647
Location: Newzealand
model: 906 Paso
year: 1990
Why , given that the fcr's have the same operating principle as the Weber ,and your belief (ain't saying your wrong ) that the climate is the cause of your icing issue, would you expect anything to change ? :D
My 906 has snorkles off the bottom of the air box that sorta point at the top/rear of the front cylinder, on a 750 can you not tuck the open end in by the cylinder or behind the oil coolers ?. (instead of the radiator) I only ever rode my Paso in icy conditions once ( frost was forming on my shoulders and gloves ) but I don't recall any icing of the carb

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 Post subject: Re: Gone to the FCR Side
PostPosted: Thu Mar 07, 2019 1:55 am 
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Joined: Sun Feb 24, 2013 11:14 pm
Posts: 76
Location: Melbourne Australia
model: other
year: 1995
Good score :thumbup: . They won't freeze.

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1999 M750 "Scrambler"
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 Post subject: Re: Gone to the FCR Side
PostPosted: Thu Mar 07, 2019 2:07 am 
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Joined: Sun Feb 24, 2013 11:14 pm
Posts: 76
Location: Melbourne Australia
model: other
year: 1995
If it's any help, a mate and I set up his M750 with open airbox with FCR39's. MJ 155, EMT needles #3, 60 pilot jets (you could try 55-58 sizes). Slow air screws were in the range of 1- 13/4 turns out from gently seated. Can't remember the idle mixture setting.
Good luck.

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 Post subject: Re: Gone to the FCR Side
PostPosted: Fri Mar 08, 2019 1:18 am 
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Joined: Sun Feb 24, 2013 11:14 pm
Posts: 76
Location: Melbourne Australia
model: other
year: 1995
Take into account we tuned for kangaroo fuel. Maybe it will help as a baseline. The pilot jets were a bit rich and we possibly could have used 55's or 58's, but a slightly rich pilot jet can be compensated for by opening the slow air jet screws a 1/4 to 1/2 turn (if the carbs came with them, they're excellent).

Looking foward to hearing how the FCR's run.

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 Post subject: Re: Gone to the FCR Side
PostPosted: Fri Mar 15, 2019 11:01 pm 
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Joined: Sat Sep 28, 2013 6:41 pm
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Location: London or Ibiza
model: 750 Paso
year: 1987
Big Thank You for the tip on the needles :)

Work and weather had stopped play for a bit but I got round to stripping the carbs for cleaning tonight and the needles they came with were OBFHM, quite a bit richer than EMT.

On the prefix bit of the needle code what I have found online seems to say the FCR39 is prefix OC (OCEMT) but then some mention OB but don't say what the difference is - Anyone know?


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 Post subject: Re: Gone to the FCR Side
PostPosted: Tue Mar 19, 2019 11:15 am 
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Joined: Sun Feb 24, 2013 11:14 pm
Posts: 76
Location: Melbourne Australia
model: other
year: 1995
Look up Patrick Burns FCR Tuning Guide. Should be a chart there on the needle codes.

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1999 M750 "Scrambler"
2004 GSXR750 Track


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 Post subject: Re: Gone to the FCR Side
PostPosted: Tue Mar 19, 2019 11:19 am 
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Joined: Sun Feb 24, 2013 11:14 pm
Posts: 76
Location: Melbourne Australia
model: other
year: 1995
http://www.factorypro.com/tech/tech_tun ... s,Pat.html

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