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Makotosun

305 piston to cylinder clearance

  • twomanyhobbies
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305 piston to cylinder clearance was created by twomanyhobbies

I picked up a couple NOS oversize pistons for my 1967 YM2C, and am ready to drop the cylinders and pistons off at the machine shop. Problem is, I'm having a hard time finding piston to cylinder clearance specs. Not mentioned in my factory shop manual. Haven't managed to find the information by searching this forum - though I'm sure it's here someplace...
Can someone help me out?
03 Jul 2020 07:07 #1

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Replied by mdscott on topic 305 piston to cylinder clearance

I couldn’t tell you exactly but, each piston is about 150cc, the spec for AT, CT1, are .0016”, but twins produce more heat so maybe larger. Maybe the same clearance as a RD350?
Thanks Mark
Roseville, Ca.

'03 ST1300
'75 Norton
'73 CB500K
'81 Honda CT110
'87 PW50
'64 McClane Edger
'02 Honda XR70R
Last edit: 03 Jul 2020 08:01 by mdscott.
03 Jul 2020 07:53 #2

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Replied by MarkT on topic 305 piston to cylinder clearance

YM2 is a little early for this forum... but still very welcome here! Info you need might not have been posted before because while many members would love to have your model, few are lucky enough!

Here's what I have:

YM2:




For reference, YM1:




Both came from an old Intertec manual I've had since I was a kid.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
The following user(s) Liked this Post: 2fishkev, swm, RT325, mdscott, nhsteve
03 Jul 2020 08:19 #3

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Replied by twomanyhobbies on topic 305 piston to cylinder clearance

Thank you for the replies! Just what I needed.
03 Jul 2020 08:32 #4

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Replied by nhsteve on topic 305 piston to cylinder clearance

Thanks Mark- going to save this as I may need the info myself at some point!
10 Jul 2020 06:41 #5

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