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RWDboy
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July 2002

Re: Yamaha 11111-88360 vs. no # ??? (ST162s)

Tue, 28 September 2004 02:31

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Yes - the standard pistons have a wedge shaped type of crown. Afaik - 3S-FE engines have 'dish' type piston crowns, as do 5S-FE and 2S engines....the 3S-GE and 3S-GTEs are the ones with the high top piston.

As for what # the 3S-GTE head has from an ST165 - it has 11111-88381, or 11111-88380 not sure what the difference is between the two, but stumpy's 1989 ST165 has the 88380, my 1988 ST165 has the 88381.

The difference as far as I can tell between jap spec and aus-delivered heads is nil...the compression difference is more than likely piston related - seeing as reshaping the heads is BLOODY hard to do - the multi-valve design just makes it impractical to have different combustion chamber shapes.

I'll post a picture of the two heads exhaust sides to show you what I mean when I say they are *definitely* physically different.

Quote:

This head seems to have more pollution gear on it as well.

The head doesn't usually have any pollution gear on it, usually that stuff is just on the intake and exhaust manifolds. Do either of your heads have yamaha numbers on them?

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Subject Poster Date

Read Message Yamaha 11111-88360 vs. no # ??? (ST162s) RWDboy Mon, 27 September 2004 03:30
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) bergerac Mon, 27 September 2004 04:52
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) bergerac Mon, 27 September 2004 05:53
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) smashed_wombat Mon, 27 September 2004 09:50
Read Message Re: Yamaha 11111-88360 vs. no # ??? (ST162s) bergerac Mon, 27 September 2004 10:37
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) bergerac Mon, 27 September 2004 12:05
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) RWDboy Mon, 27 September 2004 13:13
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) bergerac Mon, 27 September 2004 16:12
Read Message Re: Yamaha 11111-88360 vs. no # ??? (ST162s) bergerac Mon, 27 September 2004 16:26
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) Steve_Reynolds Tue, 28 September 2004 01:37
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) RWDboy Mon, 27 September 2004 13:19
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) RWDboy Tue, 28 September 2004 02:31
Read Message Re: Yamaha 11111-88360 vs. no # ??? (ST162s) RWDboy Tue, 28 September 2004 02:35
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) RobST162 Tue, 28 September 2004 04:02
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) RWDboy Tue, 28 September 2004 04:18
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) smashed_wombat Tue, 28 September 2004 05:35
Read Message Re: Yamaha 11111-88360 vs. no # ??? (ST162s) RWDboy Tue, 28 September 2004 14:06
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) RobST162 Wed, 29 September 2004 02:06
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) Steve_Reynolds Wed, 29 September 2004 05:13
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) Farmsci ST162 Wed, 29 September 2004 06:28
Read Message Re: Yamaha 11111-88360 vs. no # ??? (ST162s) Steve_Reynolds Wed, 29 September 2004 10:16
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) Farmsci ST162 Wed, 29 September 2004 11:58
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) RWDboy Wed, 29 September 2004 13:55
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) RWDboy Wed, 29 September 2004 14:16
Read Message Re: Yamaha 11111-88360 vs. no # ??? (ST162s) Steve_Reynolds Wed, 29 September 2004 23:07
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) RWDboy Thu, 30 September 2004 01:06
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) Farmsci ST162 Thu, 30 September 2004 05:22
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) Steve_Reynolds Thu, 30 September 2004 05:42
Read Message Re: Yamaha 11111-88360 vs. no # ??? (ST162s) stumpy Thu, 30 September 2004 05:34
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) RWDboy Thu, 30 September 2004 06:00
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) stumpy Thu, 30 September 2004 06:17
Re: Yamaha 11111-88360 vs. no # ??? (ST162s) RWDboy Fri, 01 October 2004 03:02

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