finn Posted January 7, 2008 Report Share Posted January 7, 2008 My 1998 315R seems to be knocking on top end revs, is this a common problem? Quote Link to comment Share on other sites More sharing options...
ham2 Posted January 7, 2008 Report Share Posted January 7, 2008 My 98 used to knock when I rolled off the throttle, until I started using super-unleaded fuel. Quote Link to comment Share on other sites More sharing options...
penno350 Posted January 7, 2008 Report Share Posted January 7, 2008 Make sure that you are using high octane petrol like Shell Advanced as a first step Quote Link to comment Share on other sites More sharing options...
finn Posted January 7, 2008 Author Report Share Posted January 7, 2008 I'm already using a hi octaine fuel, could it be it needs a top end rebuild? Quote Link to comment Share on other sites More sharing options...
popeye Posted January 7, 2008 Report Share Posted January 7, 2008 i am by no means an expert, so i can only comment on my own experiences, i also have a 98 315r, it does knock a bit and i run on the high octane fuel, i have taken my head off and found no play in the top end or bottom for that matter, spoke to a friend (who knows more than me about 2t) he just commented that its the high compression and nothing to worry about. has yours just started to make a noise? i am rather finicky over every litlle sound< if it doesnt sound right i tend to listen out for problems that aren't there!!!! obviously if ytours has started to knock and didn't before then it needs looking at. Quote Link to comment Share on other sites More sharing options...
ham2 Posted January 7, 2008 Report Share Posted January 7, 2008 (edited) A hard one to diagnose on the internet but from what I recall:- If it's a rattle-knock it's the top end. If it's a rumble-knock it's the bottom end. Tricky! I remember trying a carb' kit from Sandifords with a new slide ( with a different cut off angle) to try and cure the knock but it caused more problems than it cured. Edited January 7, 2008 by HAM2 Quote Link to comment Share on other sites More sharing options...
finn Posted January 7, 2008 Author Report Share Posted January 7, 2008 The problem is I've only just brought it and although it hasn't seen a hard life it hasn't been used much over the last couple of years. I took it out for it's first outing and noticed the knock at the end of the day, I don't think it was there at the begining. I've just changed the oil and now it won't run on tick-over it starts to rev up?????.......!!!!?? I think I'll give up for today. Quote Link to comment Share on other sites More sharing options...
hop blip and a jump Posted January 7, 2008 Report Share Posted January 7, 2008 (edited) That sounds like a hot knock!! Older gassers used to do it all the time, try cleaning the carb, check your coolant and if your fan is working first? Edited January 7, 2008 by hop blip and a jump Quote Link to comment Share on other sites More sharing options...
albert Posted January 7, 2008 Report Share Posted January 7, 2008 Try an inline temp stat ,might help it run cooler.My 04 315 used to nock when it got hot. Same stat as a gasser or sherco. Quote Link to comment Share on other sites More sharing options...
finn Posted January 7, 2008 Author Report Share Posted January 7, 2008 Thanks, i'll try all the above if I can get it to run..... Quote Link to comment Share on other sites More sharing options...
masso Posted January 7, 2008 Report Share Posted January 7, 2008 My 1998 315R seems to be knocking on top end revs, is this a common problem? yes, this is the one factor I hated about the 315! a few months after I sold it in favour of a fuel injected model...I met the guy, took the old girl for a spin, and she worked wonderfully!............he said he went to a one # cooler plug..a #6 ..............try that ..and always run race gas! if you still have problems, buy a 4rt.................a no problems-bike ....quite boring, wish something wood go wrong! Quote Link to comment Share on other sites More sharing options...
hop blip and a jump Posted January 7, 2008 Report Share Posted January 7, 2008 yes, this is the one factor I hated about the 315! a few months after I sold it in favour of a fuel injected model...I met the guy, took the old girl for a spin, and she worked wonderfully!............he said he went to a one # cooler plug..a #6 ..............try that ..and always run race gas! if you still have problems, buy a 4rt.................a no problems-bike ....quite boring, wish something wood go wrong! Try dropping a few small nuts down the oil filler hole!!! that'll give you something to fix!! Quote Link to comment Share on other sites More sharing options...
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