SOHC.co.uk Forums > CB750

Crunching gears

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kaceyk2:
one thing that tends to exagerate the crunch is a too loose chain, but I bet yours is fine....
Florence, you reminded me of when I was coming home from town in the seventies in a mini...the clutch slave burst..I had a mate with me...we crunched through the gears no probs..untill..the traffic lights were on red.. oh no oh no.... we jumped out, pushed the car allong with the motor running in neutral with the idea of building up some speed to engage second gear... when we got some speeed up, i jumped in and shouted at him to do the same....I engaged second, and tried to go as slow as possible without stalling , lurch, creep, lurch creep, he nearly got in about eight times before he actually did and thought I was doing it on purpose... we got home without any more red lights, he said he couldnt have done it again....red faced and out of breath...funny... it is easier on a bike!!!

K2-K6:
Bikes are always dog engagement (almost without exception) and would rely on the clutch totally releasing to stop any rotation from the motor when stationary, which is hard to do with an oil bath clutch that normally drags a bit with the oil between the plates.

If they didn't drag at all you'd have have more difficulty getting into gear as occasionally you get them dog to dog and have to roll it along or let the clutch out a bit to rotate the gear shafts (like when you try to change gear without the motor running).

The car one (broken clutch) you solve by starting the motor with it in first gear, bit of throttle and away you go!! done it many times in mainly minis. (no not wearing a skirt before you ask).

kaceyk2:
You got me there..why would I ask if you was weraing a skirt? I forgot to mention, my mini had er two or three teeth missing off the ring gear on the flywheel...and for some (probably explainable scientific reason that passed me by) reason it used to stop in the "no teeth-to connect to starter motor position" about 50/50 chance when it stalled or was switched off, used to have to open door, put it into second , rock it,to where the teeth were at and try again..... at traffic lights this usually meant the person behind me had lost patience and was trying to pull out to overtake and miss me door/leg... It allways puzzled me how often it stopped in this position, I mean there was loads of teeth where it could have stopped?

Bryanj:
A 4 pot will always stop when 1 of the pistons is on compression so in 1 of 4 places

p@ul:
Good luck with the MOT Pete.........

Just a quick note on the f2 gearbox, when i test rode the bike i bought last week i was surprised how slick the gearbox was even into 1st gear there was no sign of crunching at all. I just assumed this was mormal as i've heard nothing different about these bikes..... Gues i've just dropped lucky !!

The R1 however is very different story, a shocking gearbox  :o

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