SOHC.co.uk Forums > CB750
First Gear Crunch
SumpMagnet:
To be honest...I have had many bikes that engage first with a bit of a clunk.
IF the gears shift smoothly on the road, and the only clunk is engaging forst from neutral...then it's probably normal.
If you get a crunch from second to first... then I would suspect an issue with the selectors. Had an issue with an old Kwak triple I overhauled. I had done a top end rebuild, but left the gearbox. First when in with a big clunk....and it was awkward going from second into first, and it needed firm pressure or the thing would fight back. Had to replace the gear clusters....but the reason was a bent selector. Had probably been like that for a while when I bought the thing as a cheap project..back when they WERE cheap projects. On the bench...it had seemed to change gear OK .... but with the engine running, Crunch...clunk....and we were away.
Woodside:
Honda must like that crunch...
I have a 1992 blade with only 13k on the clock it does it too
bucksfizz:
--- Quote from: Oddjob on September 15, 2019, 09:38:09 AM ---Wasn't there a clutch basket mod to get more oil to the plates in order to try and stop this?
--- End quote ---
I found this thread on the US site, and it makes for interesting reading.
This post reckons that the modification helps to reduce clutch drag, and clutch drag is what I feel when selecting first gear.
Methinks a clutch strip is in the offing.
BTW, I adjusted the clutch as per K2-K6's instructions, and it was a little better, but no cigar.
bucksfizz:
I finally got round to removing the clutch.
Talk about a pain trying to remove the castellated nut securing the clutch basket.
Even with the correct tool and locking the clutch with the bike in 1st gear and the rear brake on, the nut refused to budge.
The problem was that I couldn't get enough purchase on the nut and hold the rear brake pedal down at the same time.
In the end, I locked the clutch with Mole grips/channel lock pliers butting up against a length of wood:
[ Guests cannot view attachments ]
The clutch plates were reasonably clean, but I cleaned them with petrol nonetheless.
With fresh oil in the oil tank, I fired her up, and selected 1st gear...
Hurrah! A noiseless gear selection - as I thought, it was clutch drag.
I'm just hoping the noisy gear selection won't return.
If it does, I'll try the clutch basket modification.
Nurse Julie:
We'll done 👍👍👍
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version