It is currently Sun Oct 22, 2017 2:53 am

All times are UTC





Post new topic Reply to topic  [ 8 posts ] 
Author Message
 Post subject: Smoking problem
PostPosted: Fri Jun 23, 2017 8:53 am 
Offline

Joined: Fri May 06, 2016 2:28 am
Posts: 4
Location: New Zealand
model: 907 I.E.
year: 1991
Hi everyone, just a question re my 907, it has suddenly started intermittently blowing smoke on start up, sometimes it seemed to choke on oil, other times it starts cleans as a whistle, found a split oil seal and replaced it but no real change, I'm guessing it's seals and guides, perhaps rings as well, just wondered if anyone has had a similar experience, it's done just on 80,000 kms.

Cheers


Top
 Profile  
Reply with quote  
 Post subject: Re: Smoking problem
PostPosted: Fri Jun 23, 2017 1:59 pm 
Offline
User avatar

Joined: Wed Oct 06, 2004 12:00 am
Posts: 317
Location: Nottingham, UK
model: 906 Paso
year: 1989
I think the likely problem is the exhaust valve guide showing wear. When the motor is stopped and cooled down this allows oil to seep past the seal and coat the valve. Hence, smoke on start-up.


Top
 Profile  
Reply with quote  
 Post subject: Re: Smoking problem
PostPosted: Sat Jun 24, 2017 12:43 am 
Offline
paso grand pooh-bah
User avatar

Joined: Wed Dec 05, 2007 12:35 am
Posts: 1570
Location: Newzealand
model: 906 Paso
year: 1990
Where you hiding ? :) . How long has your oil been in there for and what sort are you using . And what Km's does your bike have . My 906 has done nearly 80,000km's and doesn't smoke at all but I did note that there was a bit of wear in the valve stems / guides. If you really want to put rings in it there are 2 types ( one is almost a dykes type ) AND there is a after market Subaru ring set that ( last I looked ) is only about 80 bucks and has the same dimensions as stock ( which are closer to 400 bucks ) :)
Hamish

_________________
I wish I was young again............Id be heaps smarter than last time


Top
 Profile  
Reply with quote  
 Post subject: Re: Smoking problem
PostPosted: Sat Jun 24, 2017 1:11 am 
Offline

Joined: Fri May 06, 2016 2:28 am
Posts: 4
Location: New Zealand
model: 907 I.E.
year: 1991
Hi Hamish, I'm in Morrinsville, use Motul semi syn 10w40, bike done 80,000km, where are you.


Top
 Profile  
Reply with quote  
 Post subject: Re: Smoking problem
PostPosted: Sat Jun 24, 2017 1:25 am 
Offline
paso grand pooh-bah
User avatar

Joined: Wed Dec 05, 2007 12:35 am
Posts: 1570
Location: Newzealand
model: 906 Paso
year: 1990
Thornbury , which is about 30 km's west of Invercargill . Oil sounds ok , the reason I ask is that sometimes when the oil is getting a bit old it can smoke more , and I get the feeling ( no real proof ) that higher quality oils are likely to do this when left in a bit long . I have a friend ( sort of ...... he has a Harley :lol: ) who was about to change the motor in his Hi lux ( diesel ) due to excessive smoke and a death rattle upon cold starting but he changed from some flash Harry synth oil to some bulk buy fleet ( 20 litres ) oil and the bloody thing is like a new motor ..... #uck me it even has oil pressure now .............still leaks all over my driveway tho :)

_________________
I wish I was young again............Id be heaps smarter than last time


Top
 Profile  
Reply with quote  
 Post subject: Re: Smoking problem
PostPosted: Sat Jun 24, 2017 1:43 am 
Offline

Joined: Fri May 06, 2016 2:28 am
Posts: 4
Location: New Zealand
model: 907 I.E.
year: 1991
Hi Hamish, I keep the oil fresh, change it and filters every 5k. Funny thing is that smoking started overnight rather than a slow increase.
I also note that the seals rotate easily by hand, is that normal, I thought they would be tighter.

Cheers


Top
 Profile  
Reply with quote  
 Post subject: Re: Smoking problem
PostPosted: Sat Jun 24, 2017 10:13 am 
Offline
paso grand pooh-bah
User avatar

Joined: Thu Nov 03, 2011 10:13 am
Posts: 530
Location: Scotland
model: 907 I.E.
year: 1994
No they shouldn't rotate, they should grip the top of the guides quite tightly. It sounds like the seals have become hard and aren't doing their job.

_________________
1994 907ie
2017 Supersport 939
2015 Scrambler Classic
1982 Pantah 500SL


Scotland


Top
 Profile  
Reply with quote  
 Post subject: Re: Smoking problem
PostPosted: Sun Jun 25, 2017 1:27 am 
Offline
paso grand pooh-bah
User avatar

Joined: Wed Dec 05, 2007 12:35 am
Posts: 1570
Location: Newzealand
model: 906 Paso
year: 1990
sometimes they ( the seals ) can go up and down with the valve if they aint tight on the guide , and if you have an intake one doing that when cold ........ I once had a XR500re and when I took the baffle thing out ( to make it sound like a mans bike ) it smoked upon start up , took a while for that penny to drop and when I fitted the baffle thing back in ( girls bike again ) it stopped smoking on start .... go figure , coulda had a loose seal .... never looked :) If its only on start it might be livable with ..... just tell any ( derisive ) spectators that the cam has so much lift there aint no room for stem seals :D

_________________
I wish I was young again............Id be heaps smarter than last time


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to: