SOHC.co.uk Forums > CB750
TAPPET ADJUSTMENT - HOW THE HECK DO YOU GET A FEELER GUAGE IN???
Rob62:
--- Quote from: oapcb400 on May 25, 2018, 03:33:20 PM ---on a 400/4, Rick Parkington's rebuild in classic Bike, he states the thread pitch of the adjuster is 0.05mm, so a single full turn of the adjuster moves it by half a millimetre or 20 thou. with the crank set to the tappet setting position,wind the adjuster down until it touches the valve and then reverse by one full turn. two full turns equate to 1mm or 40 thou. not sure of other bikes thread pitch. I' m new to honda's, i'm just posting what i read, ready to be corrected!
--- End quote ---
Assuming that the pitch is indeed 0.5mm, it probably is. Then you need to wind it in and then back out by one tenth of a turn to achieve 0.002†(0.05mm).... thats not going to be easy to judge. I would prefer to use feeler gauges i think although its useful to know.
oapcb400:
Hi Rob. i'm still locked into £sd and Feet and inches, but i read the article to mean backing off the adjuster one full turn gives you exactly the 0.05mm gap, as i said i'm of a certain age and easily confused!!!
ka-ja:
Solely using the thread pitch as a measure is dodgy, the clearance needs to be checked when the lock nut is tight, the tappet always moves slightly when the lock nut is tightened
Bryanj:
Giving away a 40 year old trade secret, if you move the rocker end up and down and can feel movement but not hear a "click" that is damn near 2 thou--if you undo a fraction more till you hear a very slight "click" that is 4 thou-----WARNING----- THIS METHOD TOOK YEARS TO PERFECT SERVICING HONDA'S DAILY
sprinta:
You could get one of these:
https://www.ebay.co.uk/itm/Motion-Pro-Valve-Clearance-Feeler-Gauge-002-003-Inches-05-08-mm-Motorcycle/401487923010?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
Yes a bit pricey, around £10 inc p & p from the US, but if it does the job and makes it easier it's worth the money?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version