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 Post subject: Smoking on start up
PostPosted: Thu Jul 21, 2016 10:45 am 
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Location: Falkland Islands
Hmm The latest rebuild is finally finished BUT she smokes like crazy on start up ! It's OK if you wish to advance on the enemy without them seeing you, but whilst it goes away after a minute or five, it is a bit embarrasing. Strange thing is that this engine came off another bike frame where it had probably done around 100 miles or so after a complete rebuild - every seal, bearing, worn out bit replaced. Barrel was honed but didn't need a rebore. New rings put in (correctly I am sure). Valves lapped etc. I just took her out for a quick 10 mile spin - goes well, compression all good and no oil leaks. Oil level may have dropped a bit - I need to check it out more carefully so hard but hard to tell so far. Took spark plug out and it looks reasonable - not jet black with soot. I had a new exhaust - a Musket from NZ, and the first time this happened I thought maybe the new exhaust was just buring off some inner paint or whatever. The second time I decided to cheer up and think the same thing, but the third time is more than a coincidence - isn't it ?

All ideas more than welcome - :bg:


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 Post subject: Re: Smoking on start up
PostPosted: Thu Jul 21, 2016 10:50 am 
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got that mesage again that board quota has been reached - shame as the pic of her smoking is quite impressive


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 Post subject: Re: Smoking on start up
PostPosted: Thu Jul 21, 2016 10:54 am 
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http://s1268.photobucket.com/user/falki ... ml?filters[user]=145341569&filters[recent]=1&sort=1&o=0


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 Post subject: Re: Smoking on start up
PostPosted: Thu Jul 21, 2016 11:59 am 
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Faulky did you use genuine valve stem seals or after market ones, i have only ever used genuine seals except once
when i used an after market stem seal that came with the kit which failed.
Now i dont even contemplate using after market seals and only use genuine ones.

:D

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 Post subject: Re: Smoking on start up
PostPosted: Thu Jul 21, 2016 12:43 pm 
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Octant remember ttb will have to check the invoices but that could be the reason although strange it didn't smoke when first rebuilt


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 Post subject: Re: Smoking on start up
PostPosted: Thu Jul 21, 2016 2:52 pm 
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Not the old oil siphoning into the cases routine after standing overnight, is it?


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 Post subject: Re: Smoking on start up
PostPosted: Thu Jul 21, 2016 4:09 pm 
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deeteefifty wrote:
Not the old oil siphoning into the cases routine after standing overnight, is it?

Hi DT - it shouldn't be as I changed the nn return valve for a new one. I think TTB may have ot the proverbial on the had with the valve seals. I changed them for the ones that came with the gasket set. They have always worked before OK, but it's worth swopping them to genuine ones I think. :bg:


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 Post subject: Re: Smoking on start up
PostPosted: Thu Jul 21, 2016 5:13 pm 
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Is it worth draining the cases after it has stood a while to see how much is in. I'm not sure how much sits there in a good engine. If no one on here knows I can drain mine for you as a guide. Thought this would be easier than taking the engine out to start with. Before my rebuild mine would smoke nearly as bad as yours, but would clear after a few minutes, but using 1L oil every 100 miles, the piston had picked up on the cylinder smudging the alloy onto the oil control rings.


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 Post subject: Re: Smoking on start up
PostPosted: Fri Jul 22, 2016 5:45 am 
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Hi DT - thanks for that suggestion. You mean drain from the sump plug only I guess and measure ?- i.e. if the check valve is working properly then it will simply measure the oil in the cases. Sounds like a good plan and will do it tomorrow. I was reading your previous post yesterday as the symptoms seemed to be the same. My dipstick this morning shows a loss of oil overnight, so the check valve could be the problem. However, I am also noticing small spatters of black oil on the rear fender after a run, so that would point to a valve seal as well perhaps when running. Mind you, even with a smaller rear number plate, it still obscures the exhaust a little bit. Slightly off topic, but nobody would make me a three line plate by the way - said it was not road legal despite the MOT website saying no problem.

I didn't quite understand your point about the piston had picked up on the cylinder smudging the alloy onto the oil ontrol rings though.

Many thanks :bg:


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 Post subject: Re: Smoking on start up
PostPosted: Fri Jul 22, 2016 6:54 am 
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Take the exhaust pipe off and see if there's oil residue in the exhaust port.

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