Re-build

[houseape1000]

Hi, how hard is it to split the casings on my scorpa ?

There's a little noise thats really annoying me, I think it's possibly the little/big ends, but not really sure. Just a bit of a rattle/knock.

A friend told me to try a different 2stroke oil, and higher octane fuel ( I use normal unleaded ), as some bikes just don't like certain oils ???

I use silkolene comp II, which is about as good as it gets I believe.......I may be wrong though !

Any thoughts ?

Do scorpas always sound like this ? I may be worried about nothing.

[lee harris]

You can check big and little end without splitting the cases.

Little end is easy, just replace it for a 10er if worried. Big end is more difficilt.

Take the barrel and piston off. Hold the steel flwheel on the crankshaft and lay the rod on the cases to the front with one hand on the flywheel and the other holding the rod. If you can feel ANY vertical movement, then it will knock. A person can actually feel 0,005mm. It may not yet justify replacing though...

Edited April 20, 2010 by Lee Harris

[stork955]

Gday, you should also check rod side clearance by measuring with feeler gauges at the big end). This is usually more informative. Rule of thumb is that getting towards 20 thou is too much - check the specs though to be sure. Before any of that it might be worth while decoking the bike first - remove carbon from the head and piston crown, clean the barrell and the exhaust pipe. You could check your rod stuff at the same time. That may be all you need to do.

Cheers,

Stork