SOHC.co.uk Forums > CB750
750 f2 gearing
royhall:
Speeds in the gears are about the same as mine so would suggest the gearing is correct. Mine picks up very quickly but you need to drop gears and rev the thing. If you try to accelerate in 5th gear it is very sluggish. You didn't mention what gears and revs you were using.
On these old bikes it can often be too much mechanical sympathy causing the issue, give it some beans, the old girls love it.
On the carb issue, poor pick up could be a stuck accelerator pump or ruptured diaphragm.
Bryanj:
Back in the 70's took an 18 month old 28000 mile F2 to the IOM TT, wouldnt go over 95, smoked like a pig and dropped to 150 mpp of oil.
First one i came accross with the worn out exhaust valve guides.
The F2 cam was different and may have been changed in your bikes life and if its not had exhaust guides it will need them-----they ALL did and it was not done as a recall or under warantee unless the problem occured in the first 12 months
royhall:
There's a fix for the top end problems from CycleX in the States involving hardened guides, supposed to be a permanent fix. I hope it is as that's the fix I used on my F2. If anybody needs it this is the link http://www.cyclexchange.net/Honda%20cb750%20(%2077-78%20)%20%20F%202%20Section%20Page.htm
Bryanj:
The replacement parts from Honda were extremely hard
royhall:
The CycleX Kibblewhite parts are also longer to better support the valve and a more modern material. They reckon to have had an engine to 60k without any issues at all from the exhaust valves.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version