TRX250r.org

Author Topic: New piston or bore and piston?  (Read 4247 times)

Offline hickwheeler

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
88 hybrid 431 puma
88 (BOF Build) stock motor and oem 89 plastics
More in the works

Offline The norm

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.
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)

Offline Victork

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

Offline hickwheeler

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.
88 hybrid 431 puma
88 (BOF Build) stock motor and oem 89 plastics
More in the works

Offline F-Red

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.
Want To See My Wieners?

Offline fearlessfred

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

Offline hickwheeler

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.
88 hybrid 431 puma
88 (BOF Build) stock motor and oem 89 plastics
More in the works

 

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