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+--- Thread: clunk (/showthread.php?tid=61546)
clunk - bludclot - 18-01-13
why do bikes clunk into first gear from neutral? cars don't....
Re: clunk - snapper - 18-01-13
slack in the chain mostly i think
Re: clunk - AyJay - 18-01-13
Cars have synchromesh . . it's like a cone shaped clutch between the dogs which get the two gears up to the same speed before engaging. Bikes don't have synchromesh largely because they don't need it. Not sure why, I'd hazard a guess at it being because they're sequential, the inertias are very low (except Harleys and old Guzzis) and the ratios are so close.
When going up the box, there's just enough of a slowdown of the input gear to allow time for the unloaded dog to slip into the window of the gear it's about to slide into, but when downshifting, we blip to unload the transmission and match the input and output gears to get that window. Which is why downshifting without a blip often gets a clonk too.
I think . .
Having Google it, I see there's not a lot of pages which explain this precisely, not that I'm 100% sure I've explained it correctly anyway!
Re: clunk - red98 - 19-01-13
ayjay...well explained
.....clutchles gear changes are all about matching engine speed to road speed,the more you ride your bike the smoother the changes will be,you will get to know when the bikes happy to change up or down,with practice you can get a smooth change without using the clutch
Re: clunk - Exupnut - 19-01-13
(19-01-13, 10:44 AM)red98 link Wrote: ayjay...well explained
just dont do clutchless comin down the gears. unless u want a fooked gearset. congrats on 1000 posts red. and may u today get unexpectedly snowballed by a wicked shot and all the snow goes down the back of ur neck !! :lmao2
Re: clunk - red98 - 19-01-13
thanks exupnut
......lots of snow here in south bucks,loads of kids round yesterday with a epic snowball fight......and yes they did pick on me .....fantastic fun though