SOHC.co.uk Forums > CB350/400

Helicoil and crankcase thread repair... opinions..!!

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Bryanj:
You may have to order them but helicol lengths are measured in multiples of diameter so an 8mm2d is 16mm long. Most firms only keep 1d coils but the longer ones are definately available

Oz350Four:
Thanks folks... Will look at getting longer Helicoils...
Bryanj I'm not sure what you meant about the micrometer bit, happy to be informed...!!!??
Dont I need the two measurements (case ID and crankshaft journal OD)..??

Trevor

Bryanj:
People who have been using mics for years may not be accurate enough for Honda tolerances, they used way more accurate stuff to get down to 3 decimal places properly

Oz350Four:
Bryanj thanks for the info...  so I can get the crankshaft journals mic'd to the level required in the workshop manual.
Unfortunately I'm not in a position to spring for an uber accurate tool that I might only use once (maybe twice) short of taking the buttoned up cases to a machine shop I'm kinda stymied.
I have the letters on the end of the case (BBABB) and the numbers / letters from the crank along with the journal measurements that I have taken.
Is there any way of determining the shells required..???

Bryanj:
In the genuine Honda manual there is a table to cross refer crank codes to casing and rod codes giving you shell colours needed, its also in the parts book.
In the same table should be the pin sizes that Honda say fit the code given so you can check your measured size against that as well.
It takes a lot of practice to use a micrometer accurately, Honda used air gauges to get sizes.
Never seen casings wear or rods unless a siezure has caused a shell to spin and in that scenarion the case or rod is scrap

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