Dynamo_Delboy Posted July 22, 2014 Share Posted July 22, 2014 Looking for a wee bit of help here guys and girls.Got a 92 cbr600f and recently when i accelerate hard in 2nd gear, around 6-7k rpm its like the bike bogs down a wee bit then feels like back wheel is jerking or losing traction then has full power and goes fine through all the gears.It only happens in 2nd and only between 6-7k rpm. Quote Link to comment Share on other sites More sharing options...
eastanglianbiker Posted July 22, 2014 Share Posted July 22, 2014 have you checked the basics like chain tension and sprocket condition? Quote Link to comment Share on other sites More sharing options...
Dynamo_Delboy Posted July 22, 2014 Author Share Posted July 22, 2014 Sprocket looks ok mate.Might try giving the chain a wee tighten up. Quote Link to comment Share on other sites More sharing options...
eastanglianbiker Posted July 22, 2014 Share Posted July 22, 2014 check front and rear sprocket just in case and get hold of the chain in the 3oclock position on the rear sprocket and see if you can pull chain far enough away to see the tooth Quote Link to comment Share on other sites More sharing options...
Dynamo_Delboy Posted January 15, 2015 Author Share Posted January 15, 2015 Just remembered i had posted this threat.So chain and sprockets are fine.The problem is still there, If I accelerate hard through 1st, all is fine.2nd gear, accelerate hard slightly bogs just before 6k rpm and seems to cough/splutter between 6-7k rpm then smooth again 8k rpm upwards.3rd gear does same as 2nd.4th, 5th & 6th gear all smooth.Could this be a fuelling / carb issue?Its really annoying me especially if i go to make an overtake.Only happens in 2nd & 3rd gear.Pulling my hair out with it. Quote Link to comment Share on other sites More sharing options...
Mr Fro Posted January 15, 2015 Share Posted January 15, 2015 Could be the jets. Might also be the timing. Quote Link to comment Share on other sites More sharing options...
Dynamo_Delboy Posted January 15, 2015 Author Share Posted January 15, 2015 Jets needing cleaned?Is timing easy enough to check? Quote Link to comment Share on other sites More sharing options...
Stu Posted January 15, 2015 Share Posted January 15, 2015 sounds to me like the fueling needs setting up when you next go out stick a bit of choke on and see what happens when you accelerate Quote Link to comment Share on other sites More sharing options...
Dynamo_Delboy Posted January 15, 2015 Author Share Posted January 15, 2015 How much choke would you say stu?Quarter, half, less? Quote Link to comment Share on other sites More sharing options...
Stu Posted January 15, 2015 Share Posted January 15, 2015 try all and if anything does make a difference make a mental note then come back to us Quote Link to comment Share on other sites More sharing options...
Dynamo_Delboy Posted January 15, 2015 Author Share Posted January 15, 2015 Soon as the rain stops pissing down and wind lets up ill give it a try Quote Link to comment Share on other sites More sharing options...
Stu Posted January 15, 2015 Share Posted January 15, 2015 I best explain why I'm telling you to do it if the fueling needs sorting then sticking the choke on could help as if the fuel to air ratio is wrong by having the choke on you are altering it if the bike runs better with choke its running lean if it dies a death then its probably too rich Quote Link to comment Share on other sites More sharing options...
Dynamo_Delboy Posted January 24, 2015 Author Share Posted January 24, 2015 So today ive narrowed the problem down to the back wheel losing traction at said rpm. Came off the main road, turned left on motorway sliproad and accelerated in 2nd gear. Got up to 6k rpm then back wheel felt like it slipped to the side a bit. Noticed my chain has a small kink in 1 of the links. I must've misses it when i checked last time.Could this be problem Quote Link to comment Share on other sites More sharing options...
Stu Posted January 24, 2015 Share Posted January 24, 2015 I can't see your wheel losing traction all the time at that RPM it may have been a coincidence as for the link it shouldn't be causing the problem but you need to sort that out too did you try the choke trick? Quote Link to comment Share on other sites More sharing options...
Dynamo_Delboy Posted January 24, 2015 Author Share Posted January 24, 2015 I actually forgot all about it but ill do it tomorrow and post what difference it makes Quote Link to comment Share on other sites More sharing options...
rob m Posted January 24, 2015 Share Posted January 24, 2015 Has the jetting changed or K&N air filter been fitted? If it was me, I'd grab my haynes manual and strip & clean the carbs. Sounds like a blockage to me, possibly jet related. While I was at it I would balance them using a carbtune or similar. I had a GSXR750 in the mid 90's with a similar problem and stripping the carbs fully, cleaning them and balancing had them spot on afterwards. Quote Link to comment Share on other sites More sharing options...
Dynamo_Delboy Posted January 24, 2015 Author Share Posted January 24, 2015 Air filter is just a standard filter not K&N.As far as im aware the bike is totally standard.Jets have never been touched by me.Ive had the bike around 18-19 months and the problem started a few months ago. Quote Link to comment Share on other sites More sharing options...
Dynamo_Delboy Posted February 2, 2015 Author Share Posted February 2, 2015 Tried accelerating today with choke but made no difference.Tried it at quarter, and half.Still doing the same at the same revs Quote Link to comment Share on other sites More sharing options...
Fozzie Posted February 3, 2015 Share Posted February 3, 2015 Always in 2nd?Could it be hopping into another gear? A old aprilia of mine used to slip from 2nd to 3rd quickly due to nackered selectors. Could cause it to jump too and from!That will be shite if it is, big strip down for that... Quote Link to comment Share on other sites More sharing options...
Dynamo_Delboy Posted February 3, 2015 Author Share Posted February 3, 2015 2nd and 3rd mate aleays round about the same rev range.Only when hard accelerating.If running up the revs slowly it seems to be fine Quote Link to comment Share on other sites More sharing options...
Fozzie Posted February 3, 2015 Share Posted February 3, 2015 Ah 2nd and 3rd... I wonder if it's a dodgy shift drum... Bouncing the gear up a gear under strain. You could get 5-6th gear issues on an old bike that did that. Id need a video really to tell if it was fuelling or mechanical. Quote Link to comment Share on other sites More sharing options...
Dynamo_Delboy Posted February 3, 2015 Author Share Posted February 3, 2015 When i accelerated today in 2nd gear it definitely feels like the back wheel is slipping and losing traction. Could feel it slipping out slightly at the rear end when going in a straight line then after the 7k rpm it grips fine again Quote Link to comment Share on other sites More sharing options...
Stu Posted February 3, 2015 Share Posted February 3, 2015 I suggest going and getting the bike on a dyno this way they will check your fuelling through this rev range and you can also keep an eye on things as its been run up it will only cost about £30 tell the operator all your problems as they may refuse to do it but if they do then they know what they are looking out for too It sounds a bit strange to me I dont think its gearbox and I find it really hard to believe the rear wheel is actually slipping! although you could be suffering from a touch of clutch slip Quote Link to comment Share on other sites More sharing options...
skiffer Posted February 3, 2015 Share Posted February 3, 2015 I was going to say clutch slip.. it sounds exactly what I had until I changed the friction plates. Only when I opened up. Certain gears will put more exertion on them, right? Quote Link to comment Share on other sites More sharing options...
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