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Old 10-06-2012, 12:34 AM   #1080
Box'a'bits OP
In need of repair
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Joined: Sep 2008
Location: Wellington, New Zealand
Oddometer: 2,390
Pulling down the top end

Started to pull down the top end on Gus.

This originally started because the RHS base has started to seep, then a compression test showed the RHS down a bit on the LHS. I decided to re-ring, & to use the higher compression pistons I had left from a prior rebuild for the RS (went to 1st oversize - iron bores).

First I soaked the RS piston in 100% concentrated ‘Simple Green’ overnight. I’d heard that this assisted with carbon removal. If it does, overnight is insufficient soaking. Very hot soapy water had a better impact. Supershaft also noted that chopsticks make a good carbon removal tool / scraper. He’s right. And an old penny worked for the more stubborn patches, but is more inclined to mark the piston if not used carefully.

Removed the exhaust, the carbs, & dropped off the RHS barrels & heads.

The Barrels are showing their 215k kms wear. There is a ridge near the head, at the bottom (pushrod side) front of the barrel, visible, & with the hone marks worn away. You can just feel it when you run a finger or thumb over it.

Pulled the valves. There is discernable slop between the valves & guides. Definitely need attention, but perhaps not this time. The seats look okay.

I'm trying to talk myself out of stealing the RS heads. They had new valves, guides & seats not long before it got parked. I would need to flare out the exhaust to do that (40mm spigots). But its twin plugged...

I’ve spent a reasonable amount of time de-carboning Gus's RHS head & the RS pistons this afternoon. I’ll put up photos in tomorrow’s installment
My '91 R100GS thread is here
My Ride photos are here

It's just better when there's twins involved....

Box'a'bits screwed with this post 10-13-2012 at 11:57 PM
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