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01-18-2015, 10:47 AM
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#41 | |
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Gone Wild
Join Date: Apr 2014
Location: Flint, MI, USA
Posts: 656
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Re: 89 EC25 3pg rebuild questions
Quote:
  I get them lined up close by eye, then set it on the truing stand, brass-hammer it to dead-nuts. These singles are painless compared to the sled/PWC triples. I'm in the middle of taking a 650 twin Yam to 1010cc. Pin holes get welded up, redrilled farther out. Rod and piston height, cam chain, studs all have to be matched up. Re-sleeved for much bigger bore, cut, rotate & weld cam since the crank is being indexed to 90-degrees instead of 360 to smooth the vibes and power delivery. One we de-stroked to allow bigger bore and valves for a class-limit GNCC ATV racer.  Wanna change jugs, but the pattern is different?  |
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01-18-2015, 06:38 PM
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#42 |
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Gone Wild
Join Date: Apr 2014
Location: Flint, MI, USA
Posts: 656
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Re: 89 EC25 3pg rebuild questions
Scraped, scrubbed, baked, blasted, washed, and bearings installed.
(sounds like a better weekend than I've had in a long time) |
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01-19-2015, 02:56 PM
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#43 |
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Getting Wild
Join Date: Dec 2014
Location: Northern Indiana
Posts: 92
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Re: 89 EC25 3pg rebuild questions
Back in the day we used used to smack them on the floor then back on the truing stand, smack again and repeat. Harley's of course.
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01-25-2015, 12:53 AM
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#44 |
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Gone Wild
Join Date: Apr 2014
Location: Flint, MI, USA
Posts: 656
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Re: 89 EC25 3pg rebuild questions
Back to the front page, with a fresh bore job and crank rebuild :) No concrete was chipped in the creation of this pictorial.
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01-27-2015, 06:53 PM
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#45 |
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Getting Wild
Join Date: Dec 2014
Location: Northern Indiana
Posts: 92
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Re: 89 EC25 3pg rebuild questions
How much did it take on the bore?
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01-27-2015, 07:39 PM
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#46 |
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Gone Wild
Join Date: Apr 2014
Location: Flint, MI, USA
Posts: 656
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Re: 89 EC25 3pg rebuild questions
.020 cleaned it up.
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01-27-2015, 09:02 PM
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#47 |
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Getting Wild
Join Date: Dec 2014
Location: Northern Indiana
Posts: 92
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Re: 89 EC25 3pg rebuild questions
So what brand piston? I thought the re-pops were only .025 and .050.
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01-28-2015, 11:11 AM
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#48 |
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Gone Wild
Join Date: Apr 2014
Location: Flint, MI, USA
Posts: 656
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Re: 89 EC25 3pg rebuild questions
Attack of the Metric System. I'd substituted inch.
Oversizes are .25mm and .50mm, close to US .010 and .020 |
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01-30-2015, 04:34 PM
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#49 |
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Getting Wild
Join Date: Dec 2014
Location: Northern Indiana
Posts: 92
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Re: 89 EC25 3pg rebuild questions
My bad, the gears were not turning upstairs, that does happen sometimes.
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02-01-2015, 10:48 PM
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#50 |
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Gone Wild
Join Date: Apr 2014
Location: Flint, MI, USA
Posts: 656
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Re: 89 EC25 3pg rebuild questions
She's fresh!
Getting the port timing sorted. |
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