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New piston or bore and piston?
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Topic: New piston or bore and piston? (Read 4247 times)
hickwheeler
Hero Member
Posts: 1328
Total likes: 160
New piston or bore and piston?
«
on:
January 04, 2016, 06:56:42 PM »
Just tore the top end a part. Looks like I should be able to just do a piston. But I thought I would see what you guys thought. Thanks
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88 hybrid 431 puma
88 (BOF Build) stock motor and oem 89 plastics
More in the works
The norm
Global Moderator
Hero Member
Posts: 1331
Total likes: 325
New piston or bore and piston?
«
Reply #1 on:
January 05, 2016, 12:00:43 AM »
Gene I would hone it and then measure the bore and check the ring end gap. That should tell you what you need to do.
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1986 Trx250r-- Hybrid Engineering 391(Good bye super 310)
1986 Trx250r-- Hybrid Engineering ported stock 86 cylinder
1986 Trx250r-- craigslist engine with unknown ported 89 cylinder.
1985 Atc250r-- Needs a lot of work (Super 310's new home)
Victork
Sr. Member
Posts: 422
Total likes: 0
New piston or bore and piston?
«
Reply #2 on:
January 05, 2016, 12:12:53 AM »
Going back to your other thread about the porting, is it ported? Looking from inside the cylinder it looks like some work was done
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hickwheeler
Hero Member
Posts: 1328
Total likes: 160
New piston or bore and piston?
«
Reply #3 on:
January 05, 2016, 12:33:23 AM »
Yes now looking at it off the bike it has had some port work done. I was wrong saying it was unported.
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88 hybrid 431 puma
88 (BOF Build) stock motor and oem 89 plastics
More in the works
F-Red
Hero Member
Posts: 737
Total likes: 58
New piston or bore and piston?
«
Reply #4 on:
January 05, 2016, 01:16:24 PM »
Definitely measure the bore after honing. You do not want excessive ring gap or piston clearance. I learned the hard way on that one.
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Want To See My Wieners?
fearlessfred
Sr. Member
Posts: 368
Total likes: 1
New piston or bore and piston?
«
Reply #5 on:
January 06, 2016, 12:35:07 AM »
The exhaust bridge looks like its been relieved to much and only the exhaust has been champhered
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hickwheeler
Hero Member
Posts: 1328
Total likes: 160
New piston or bore and piston?
«
Reply #6 on:
January 06, 2016, 12:56:24 AM »
Ya I noticed the lack of chamfering. I think I'm going to be taking it to Pete.
Logged
88 hybrid 431 puma
88 (BOF Build) stock motor and oem 89 plastics
More in the works
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New piston or bore and piston?
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