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'smoke' coming from air filter on 77 Bay - Fresh Rebuilt engine
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Adski
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PostPosted: Tue Feb 13, 2018 6:43 pm    Post subject: 'smoke' coming from air filter on 77 Bay - Fresh Rebuilt engine Reply with quote

Hi guys,
Spent some time tuning my carbs last night on my newly rebuilt engine, where i noticed it was getting quite fumey in the engine bay. Then I noticed that there was quite a lot of smokey fumes coming out of the air cleaner setup.

Does anybody know why this would happen on a newly rebuilt engine that has only done about 1000km max since it was rebuilt with all new parts?

thanks!

*video link removed - not working*
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Last edited by Adski on Tue Feb 13, 2018 9:15 pm; edited 1 time in total
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TomWesty
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PostPosted: Tue Feb 13, 2018 7:07 pm    Post subject: Re: 'smoke' coming from air filter on 77 Bay - Fresh Rebuilt engine Reply with quote

Does the crankcase vent into the air cleaner? If so, it may be that the rings havenít fully seated and you are getting some blow by into the crankcase venting into the air cleaner. Donít know....
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aeromech
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PostPosted: Tue Feb 13, 2018 8:14 pm    Post subject: Re: 'smoke' coming from air filter on 77 Bay - Fresh Rebuilt engine Reply with quote

Sorry but I canít view your video
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tommu Premium Member
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PostPosted: Tue Feb 13, 2018 8:34 pm    Post subject: Re: 'smoke' coming from air filter on 77 Bay - Fresh Rebuilt engine Reply with quote

Need to be logged into google to see this. Try YouTube to reach a bigger audience.
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Adski
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PostPosted: Tue Feb 13, 2018 8:54 pm    Post subject: Re: 'smoke' coming from air filter on 77 Bay - Fresh Rebuilt engine Reply with quote

Ah bugger. Sorry.

Well maybe ignore the video and just imagine a small amount of smokiness coming out from where the air cleaner horns were attached. Would this be considered normal? 🤔
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honestcharlie56
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PostPosted: Tue Feb 13, 2018 11:55 pm    Post subject: Re: 'smoke' coming from air filter on 77 Bay - Fresh Rebuilt engine Reply with quote

TomWesty wrote:
Does the crankcase vent into the air cleaner? If so, it may be that the rings havenít fully seated and you are getting some blow by into the crankcase venting into the air cleaner. Donít know....


Answer this. Good luck!
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Spike0180
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PostPosted: Wed Feb 14, 2018 7:17 am    Post subject: Re: 'smoke' coming from air filter on 77 Bay - Fresh Rebuilt engine Reply with quote

I had similar issues with my new engine. It has reduced (1500ish miles now), though I still get a good amount of blow by out of my crank case breather. Keep an eye on it, it shouldn't get worse than it already is.
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Wildthings
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PostPosted: Wed Feb 14, 2018 12:00 pm    Post subject: Re: 'smoke' coming from air filter on 77 Bay - Fresh Rebuilt engine Reply with quote

You may be smoking your oil pretty good during the middle of summer on a rebuilt engine, this smoke will make its way out through the crankcase ventilation system. Make sure your engine is well tuned with the timing set to 28į BTDC at 2500+ rpms, hoses off and plugged. If you are seeing ambient temps in excess of 35įC then you could bump your timing back to only 27į or even 26į BTDC.

Running either a straight weight oil like 30wt or 40wt or a synthetic oil may cut down on smoke as well. YMMV
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