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Been running my Kand B 7.5 rigger on 30%,15%castor,OS R6 cold plug,.010" squish ,runs well,,gets on pipe about 20 feet away,,So I tried some 60%,,12% castor fuel,same prop and engine dies after launching about 10-15 feet,,tried rich lean etc 3rd channel,,after 4 failed launches I managed to get...

I'm about to purchase a 4pm,that comes with 2 x R334SB and not a bad deal price wise here in Aus..although I probally would prefer the R304SB with single antenae and use a 400mm ext aerial,but the shop doesn't stock those,,but has the R314SB,which I think is similar to the 304,and I think...

Just trying to find out the best or recommended fin depth , from the waterline to bottom of curve as I'm making a staino fin from .050" plate,that attaches to a 1/8" alum plate, above the waterline,and bolted to the sponson for some reduced weight,added stiffness and more adjustability,,I...

Playing around with my .21,,Just wondering about the effects of SP induction,as I'm getting around a .005' gap under the skirt at TDC on my .21,,approx 180*/ 182* ex,124*/126* transfers ,pretty much where I want it,,a .005" shim puts the ex and transf up a bit too much for a cat,,I understand it...

Is it best to just backcut TE,,or blend it down along the TE cup face to reduce some cup on a 2217- 19deg-38 abc ?,,would it be better to reduce more closer to hub and leave more at the tips ?,,,cheers