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How to tell what to replace...


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das134
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Joined: 04 May 2011

Location: New Zealand
1991 Honda NSR250 MC21
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How to tell what to replace...

Mon Jul 23, 2012 12:22 am » Post: #1 » Download Post

Hi everyone. I'm just about to strip down my top end to remedy a leaking head gasket problem. Before I get stuck in I wanted to make sure I know what to do/look for.

1. The top end was done on this bike was 'refreshed' (no new pistons) only 15 hours ago. It is a track/race bike that gets a thrashing, but in the interest of time and money, is it necessary for me to strip down the whole top end? Or can I just replace the head gaskets and save the rebuild for next time?

2. If stripping the barrel off is the way to go, how should I approach the piston issue? Tyga don't stock the A cylinder pistons I need and they are very expensive from the UK with my NZ exchange rate. Can I resuse with new rings or old rings with acceptable tolerances? I don't know the general rule with this.

I don't want to skimp, but dont want to replace things if it is not necessary.
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Neal

 
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Location: Scarborough
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Mon Jul 23, 2012 2:36 pm » Post: #2 » Download Post

Hi , lift the barrels and measure the ring gap . It will give you an indication of how worn they are .
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