This is how I cut the circlip grooves into the pistons.
The groove tool is 0.42mm wide for 0.4mm wire circlips.
I groove 0.23mm deep or 0.46mm diameter from touch. I like to tape the outer edge of piston crown just to make sure
I do not damage the seal band or top edge.
When clipping finished pistons, I make a plastic piston clamp, and put a paper washer between the piston and the fixture.
Normally I would put the circlips in before finishing the pistons, but this time did them afterwards.
Neil
Thanks for the report Rob. Great to see some of the Welly/Palmy boys doing well. How did the GPR 2T go? Kel your bike is looking very nice. You going to race in the Sandbaggers race this year?
It's all good humour, as we all know, every racer does what suits their own style, and their bikes set up.
If life was all one notion, it would get boring very fast.
Lets all enjoy the sport with good humour, good comradeship, and let this moment give us all determination to keep up the spirit of buckets. Was thrilled to hear TZ's reaction to the day, the sport is a bit more then our occasional ribbing.
But it does give us the odd laugh or two.![]()
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Red line best power with the original main and 1.25 air correction jet. Blue line, 1.45 air correction plus bigger main jet.
Great to have such a clear result of what can be achieved by adjusting the air correction jet to bend the fueling curve.
The GPR 2T looks good and went very well but the ignition trigger rotor broke loose.
Apparently it came away after the bike had been started several times using a battery drill to spin it over by the crank nut.
Not a biggie, with any new build there are always little issues that need to be resolved.
The peak of bucket chassis development is certainly the GPR chassis at the moment. Very nice units.
That 2T motor looks very "competitive" with it's little built-in water pump housing.
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