hi all, sad to say my first post as a member is to ask for ideas, took possession of my beautiful 1198 last week. The quickshift was seized so I worked my magic and repaired it. On my test ride, greasy roads and very cold so I wasn’t being any sort of nutter with my right hand, went from 1st to 2nd and got neutral. I skied the revs and after that it didn’t sound happy. Here’s what I’ve checked: Cylinder leakage: excellent, less than 5% leak. Belt timing: seems correct, although I need to accurately determine tdc because without the correct tools it’s vague. Riding the bike, it sounds as if a exhaust manifold is blowing/ massive induction noise that seems to come from the front, and a lack of power. Anybody have any ideas/ suggestions? I’m going to look inside the airbox next, but I’m a bit baffled to be honest. Cheers
no reason why gearbox should be ruined from a buzz after a missed gear? ^ Good news about the compression as has to rule bent valves out, I don't know this engine well enough but wonder if it's possible that one cam pulley has hopped a tooth and if this is even possible without piston/valve clash. Louder induction roar (and power loss of course) could fit in with this.
Maybe take a look around the airbox and intake manifold rubbers. I can't think why a spike in revs might cause this, the limiter should prevent any damage, but with you reporting increased intake noise, it's simple enough to take a look as you have the tank off.
no rev limiter is foolproof unfortunately, a wide open blip from tickover beats most of them unless limiter set for particularly low revs already.
Thanks for the advice all, Not checked belt tension with hz yet, however I did observe that the vertical cylinder seems to have a slightly slacker feel to the belt than the horizontal one. I wouldn’t usually expect an over rev to make belts jump teet, more a slack belt on cranking issue i thought. The canshafts are slotted and when timed correctly align with eachother. Will check all again and probably make a tool too. After the over rev, dipped clutch and selected 2nd I got a big pop back, in my head I thought that if it does that on every upshift, it will be cool. Then i realised that all was not good. I’m now wondering if it backfired into the induction and has caused an issue there somehow- will investigate. Thanks again all.
A certain unmanned member in here bought a 1098R in the spring/summer. Driving 1/2 length of country to fetch. First ride, got 1/2 a driveway before stalling and "awful noise". Stuffed it in a van and back to Winchester where it turned out absolutely nothing wrong with it. Oh how we laughed....... (Edit: we were all pleased that it was just paranoia, nobody would think a dead 1098r funny) (Edit Edit: and we love him really) (Edit Edit Edit: and I'm not just saying that as I need some new belts soon.......)
Easy enough to check belt timing and very unlikely but certainly not to be ruled out, often caused by over-rev, even chain driven in their day. A backfire could have damaged air filter but no experience on this engine.
How about posting pics of the belts at tdc, as well as video with sound of the blowing exhaust and massive induction noise?
Has anyone ever missed a gear and caused a problem like that which is suspected here? Most track or race bikes live at 3/4 or more revs their whole life without issues. Over revs might not be healthy but they don't generally cause engines to blow unless its been happening regularly for a long period of time.
New bike syndrome is more likely. Set the pegs right. Get used to it. They need a firm boot anyway. Good luck
Thanks again for the advice, I’ve rechecked the timing, and it’s correct. I’ll post pucture tomorrow with luck. Quite a bit of reassemby required to do a sound clip, so will see how I get on. Current thinking is something like a valve lifter issue. Would account for good cyl. Leakage results but lack of power. No tap tap tap and no weird nouse, aside from the noise already described. 90% sure its not nervous newbie syndrome. But would love that to be the case.
