my bike jumped forward ( missfire question)

[John 675]

Coming home last night with the mrs on the back and we merge on to the A52 (dual carrage way) i shift into 3rd and the bike hits 70, then it lurches forward twice??? now im hoping it was my rev limitor and i just didnt notice, but it was really quite violent, i thought id hit something could this have been a miss-fire?? it was very strange because the bike dipped forward as if i was breaking????

anyone?? :smt086

[petevtwin650]

Very worrying. Not least of all because you couldn't be sure it wasn't the rev limiter!

IMO, it has to be something at the front for the bike to dip. I'd check the brakes and make sure they're not binding.

[Tomcat]

probably not, but my first thought is did you let your clutch out correctly ? If you twitched on it ?

[John 675]

probably not, but my first thought is did you let your clutch out correctly ? If you twitched on it ?

i wasnt touching it before it happend but im going to go out on it soon and run it into the redline again and see when the limitor kicks in and if it feels the same.:(

[Tomcat]

i wasnt touching it before it happend but im going to go out on it soon and run it into the redline again and see when the limitor kicks in and if it feels the same.:(

I know my clutch biting point crept in all of a sudden, and it caught me out a time or two, before I adjusted it. To be honest your description sounds more severe then that anyway ... take care ;)

[John 675]

I know my clutch biting point crept in all of a sudden, and it caught me out a time or two, before I adjusted it. To be honest your description sounds more severe then that anyway ... take care ;)

it has only done it that once, but im starting to think it was rev limitor because @70 when that kicks in it does chuck you abit, ( im hoping anyway )

[Baph]

I'd argue that it wasn't the rev limiter by your description. 3rd gear 70mph you shouldn't be on the limit. Close to it, yes, but not on it. The limiter on mine would get me to around 80ish before it happened.

Also, not long ago I found the limiter (in 3rd funnily, just didn't see what speed I was doing) whilst overtaking a truck. All I really felt was a hesitation in the bike, no real dips that I noticed.

Could it of been a pot hole type jobby where you felt the front move & maybe clonked a bit?

If you were changing gear at the time it could of been a ham fisted clutch/throttle.

Without being there, it's difficult to say, but I reckon it's not the limiter.

Take it easy until you're sure it won't catch you out again.

[101bigshane101]

my dad had that on his old TLR
it turned out that the clutch springs had worn and it was slipping so would bob slightly

just a idea

[John 675]

Well today i had another run out and i have a full understanding of what the problem was... i missed the shift to third.... clutch in did the foot action and didnt even touch the gear peg. . . so bike hit the red line at 75Mph in second and jumped . . . i was pretty shocked when it happend the first time probably why i thought it was worse so nothing is wrong and i am an idiot :rolleyes:

[gettin2dizzy]

redlining with your gf on? hope she was wearing the right gear!

[John 675]

redlining with your gf on? hope she was wearing the right gear!

She is ALWAYS made to as much as she protests! but it red lined because i thought i shifted gear but i didnt. . . :-?

[phil24_7]

You wanna try shifting DOWN a gear when your approaching the limiter instead of up like I did this week. OMFG, scares the crap outta ya, nearly chucks you off the front AND nearly blows the engine up, but it does wake you up!!!!

Moral of the story is pay attention and stay awake when you decide to go from slow comfortable riding to hoonin it!