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Air leak?

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Air leak?

Postby jonno » Sat Jun 22, 2019 2:54 pm

When I start up my TS1it ticks over nicely,1200 rpm approx, but when I return from a ride where it wont rev out above 4500rpm, the tickover is higher 2200rpm and wont settle down.Does this dound like an air leak/timing/reeds? It revs ok 8000rpm when on the stand.
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Re: Air leak?

Postby Fast n Furious » Sun Jun 23, 2019 1:31 am

Check that the carburettor/manfold rubber coupling hasn't split.
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Re: Air leak?

Postby MickYork » Sun Jun 23, 2019 7:15 am

The "not revving out over 4500" sounds more like electrical......i'd check/change the stator.
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Re: Air leak?

Postby col68 » Mon Jun 24, 2019 6:47 pm

Have look at inlet manifold front screw that comes up from bottom buggers for leaking there .
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Re: Air leak?

Postby Fast n Furious » Wed Jun 26, 2019 2:05 am

jonno wrote:When I start up my TS1it ticks over nicely,1200 rpm approx, but when I return from a ride where it wont rev out above 4500rpm, the tickover is higher 2200rpm and wont settle down.Does this dound like an air leak/timing/reeds? It revs ok 8000rpm when on the stand.

When you say it revs out 8K on the stand....is this when its a cold engine and does the rev limiter scenario only seem to come in when under load?
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Re: Air leak?

Postby jonno » Wed Jun 26, 2019 5:04 pm

Yes fast,think ive sorted it. One of the exhaust nuts wasnt tight as it should there was a lot of black gunge sprayed about. Seems it was a carb issue dropped the needle down and its a lot better,tho surely this would have meant it would bog down when I revved it on the stand?
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Re: Air leak?

Postby Fast n Furious » Wed Jun 26, 2019 10:44 pm

No not really.
Even badly setup carbs will rev out ok in neutral most of the time.
Sometimes fuel frothing in the float bowl can give this problem. Hard to diagnose though.
How old is the carb? They do wear out eventually.
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Re: Air leak?

Postby jonno » Thu Jun 27, 2019 8:43 am

Its a fairly new carb.Had it setgor a jl3 but have fitted an mb clubman.Didnt think there would be much difference but there obviously is.
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Re: Air leak?

Postby ULC Soulagent » Thu Jun 27, 2019 11:20 am

Had a friend who changed from a mb clubman as it wouldn’t rev out although I’ve never had any issues with my Bgm clubby on the rev front ;)
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