classic motorcycle forum

Motorcycle Discussions => British Bikes => Topic started by: charlotte4 on May 09, 2007, 02:12:06 AM

Title: problem with sunbeam s8
Post by: charlotte4 on May 09, 2007, 02:12:06 AM

recently pulled my sunbeam s8 1954 from the back off the garage. drained the fuel and put fresh in. took a bit off time to get going running but got there. when you try to rev it, its a bit rough and black sutty smoke. checked a few things but no luck. anyone got any help and pointers how to solve.

Title: Re: problem with sunbeam s8
Post by: L.A.B. on May 09, 2007, 04:25:59 AM

Black smoke from the exhaust would suggest the mixture is far too rich. Possibly the carb float has stuck, or the float needle isn't seating properly?

Title: Re: problem with sunbeam s8
Post by: Blue on May 23, 2007, 02:18:53 PM

did you drain the oil and replace with fresh stuff? the cylinder bores might be getting lubricated from - and therefore burning - ratty old oil. if this is the case, the black smoke might disperse once the oil is refreshed

out of interest, are those S7-8s an integral oil sump?