BannedCR500Riders.com

Ok so its been a little over three years on this one.
16 races, that many, and more mx practice rides, three trips to Jawbone (50 miles+), four or five dune rides and I don't know how many others.

Washed the bike, rode around the block a bit to get her warm for a compression test.
Only blew 100 psi.  :(  shortly after I got her back with fresh rings from T2 it was at 140 psi. cold.

Later on I'll match the before and now pics as I get them done.

Ring end gaps measure .023, was .018 at T2 time.

I'd say I gotten a fair amount of seat time from this top end. I'll try and find out what the cylinder to wall clearance is before its bored.

Pics so far;








Ams Dominator @ 50:1.   He asked,  :bonk:

You can really see where the bridge and the decompression grooves are.
                                     Now.
Then
                                     Now
Then

Q500 asked about running 80:1 cause he knows that I have ran 100:1 in the 250's
Hadn't really thought of that, now you mention it. 50:1 for the first gallon or two.


The marks left by the rings is not oil left behind, there actually one to two thou deep.  :bash: Why is that?


Quite a bit of wear on the bridge, Yeah just cut it out, it'll be ok.






Quote from Iggy F451 on Jun 1st, 2007, 5:27pm:
The marks left by the rings is not oil left behind, there actually one to two thou deep. Why is that?

Too lean with the oil/fuel ratio? -Ellet


89.75mm bore.

Igg-ro... I need to split right now... but I have opinions ( ) on whats going on...

Check back here later tonight...

Bob

Igg... not ever going to touch the whole bean oil / Amsoil issue...

BUT...

I have read alot of articles.... every one of the states the same thing...

"NEVER has an oil been created, that is so good in lubrication qualities, that is quality and replace the quanitity needed for proper engine operation."

Oil does more than lube.....

1. It conducts heat.

2. It asssits the rings in sealing

3. It cleans

4. It carries away debris.


At 80:1.... your stuff dosent look to good...... It would probably look prettty good at 40:1....

.....and amazing at 32:1

Why dont you try and run more oil next time... and see how it looks at overhaul time?

"whole bean oil / Amsoil issue... "

I'm not worried about that either.

It was Qauntam/Q500 who asked about 80:1

I've been running 50:1 the whole time, which makes it look worse to you.

Personally I don't think Brian did a very good job of reassembling it for the AF. I never mentioned it before but it just didn't feel right trying to get her started after getting it back from Brian. Seemed like there was no oil on the piston/rings or cylinder when he put the top end back together. After the first ride she seemed normal again. I'm not blaming him, there's just that question that will never get answered.

Still doesn't really explain why ring groves form at the bottom of the stroke. The top I can understand.

iggys-amsoil wrote: Still doesn't really explain why ring groves form at the bottom of the stroke. .

Can you post better photo's?

I'm surprised it looks the way it does @ 50:1 too.

AlisoBob wrote:

iggys-amsoil wrote: Still doesn't really explain why ring groves form at the bottom of the stroke. .

Can you post better photo's?

Nope, already have new piston and cylinder installed.

Been messin with the kicker gear trying to align it so it doesn't touch the frame or pipe. Figured nows the time since its apart. Just gota do a fit check to make sure it doesn't hit the pipe.