Crankcase Cover Screws

Dogsbd · Post by **Dogsbd** » Tue May 22, 2007 10:29 pm

Are the 6mm 305 crankcase cover screws JIS or standard metric? I see stainless allen head sets on eBay that are supposedly for a 305 but they're listed as being standard metric, not JIS. So does that mean they are a direct replacement or would one have to re-tap the case to use standard metric?

Also see the lengths listed here:
http://cgi.ebay.com/ebaymotors/ws/eBayI ... 0124609452

They list lengths of 16, 25, 35, 45, 55, 70 and 80 mm.
My CA77 parts book lists lengths of 16, 20, 30, 35, 40, 45, 60, 75 mm.

Is this length difference critical, or can I use a 25mm where the book calls for a 30mm?

Dogsbd · Post by **Dogsbd** » Tue May 22, 2007 10:48 pm

I was searching crankcase screw part numbers on google just for the heck of it when I came across this:

http://www.speedsupplies.com/partslisti ... ategory=HN

I've ran all the crankcase screw part numbers in the "Enter Your Part Number:" box and it seems that they have them all in stock. But a bit pricey with the $14:00 S&H fee.

piecutter · Post by **piecutter** » Wed May 23, 2007 7:16 am

They are standard.

kustommusic · Post by **kustommusic** » Wed May 23, 2007 9:28 pm

They have worked for me. The JIS are only used on the points cover, ( I Think! ) Steve Greer

LOUD MOUSE · Post by **LOUD MOUSE** » Thu May 24, 2007 9:29 am

Points cover, points to plate, plate to head, rotor cover, both lever perches on bars, tank badges and I think the 2 on fuel valve and front lock cover. ..............lm

kustommusic wrote:They have worked for me. The JIS are only used on the points cover, ( I Think! ) Steve Greer

Dogsbd · Post by **Dogsbd** » Thu May 24, 2007 2:26 pm

Thanks for that list LM!

By "fuel valve' are you referring to the petcock? I ask because if I don't get my petcock screws broke loose I am going to need some!

Also it appears that the screws that attach the condenser to the head are also JIS as they share the same part number (93500-05012) with the screws that attach the points to the plate.

LOUD MOUSE · Post by **LOUD MOUSE** » Thu May 24, 2007 2:51 pm

The 2 SMALL ones which hold the On/Off lever.
Could be on the condenser. ..........lm

Dogsbd wrote:Thanks for that list LM!

By "fuel valve' are you referring to the petcock? I ask because if I don't get my petcock screws broke loose I am going to need some!

Also it appears that the screws that attach the condenser to the head are also JIS as they share the same part number (93500-05012) with the screws that attach the points to the plate.