Once again why GG never dies

[brains]

The 05 250 had a strange fault (see - electrical - fix for no spark), so I thought it was about time to check on the rings......

Factory spec on MAX wear/ring gap = 0.7mm
Mine = 6mm

Just go's to show that a GG will run forever, it was still running fine with these pieces of wire (rings) around the piston.

[Kurdt]

How many hours on your bike?

[brains]

Difficult to say, approx 200 hours

[iajim]

just out of curiosity, what oil and ratio are you using?

[brains]

40:1 Motul or Bellray

I have only recently swapped over to Motul. With the Bellray I have had amazing results with bikes over the years.

[bchatt]

Sounds like one end of the ring has busted off. Any damage to the bore ? Scores or damage around the transfers or exhaust port?
You did say 6mm , wow, was that the bottom ring?

[brains]

Both rings had the same wear, no broken bits. The barrel is fine, not a scratch. The piston should have been replaced along with the rings as it is out of spec, but I just changed the rings and with the new compression, I would hurt myself if I tried to start it without a riding boot on.

[hannesd]

Originally Posted by brains

Both rings had the same wear, no broken bits. The barrel is fine, not a scratch. The piston should have been replaced along with the rings as it is out of spec, but I just changed the rings and with the new compression, I would hurt myself if I tried to start it without a riding boot on.

i still think it's best and safest that you replace the piston aswell.
because when the piston has too much play,it could hurt the nicasil layer.
and to replace that, it costs quite some... it's just a thought tough...

ciao, hannes.

[brains]

I agree, but my thinking is that I will get the piston and barrel done at the same time. Right now it is a quick fix

[darren]

Rebuilt my 250 Jan 09 (new main bearings and seals)

The ring gap was bang on 0.7mm so i left it

Still going strong now over a year later. i ride the bike every weekend.