The RD400 drag bike

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AMCQ46
Posts: 16687
Joined: Mon May 11, 2009 4:54 pm
Location: Worcestershire / Warwickshire border

Re: The RD400 drag bike

Post by AMCQ46 »

MK_WF wrote: Mon Jun 10, 2024 7:22 pm I hope you were kidding on the 0.3 g difference.

I even ran 0.5 mm different size and brand pistons like Prox & Wiseco as a quick and dirty weekend repair on my YPVS. That makes up for maybe something like 10 g.
Guess what: it didn't vibrate more, just in slightly other rpm ranges. That was all.

Compensating deck height with different base gaskets is possible, but not smart for long term use. Imagine next rebuild in 5 years - will you remember which thickness goes where?
Better put on the list to machine both cylinders to the same height in order to have everything symmetrical.
Well spotted, 0.3g was a typo, should have read 3grams, but I also think that Harry is very exacting when he builds an engine, he had also weighed and matched the conrods before he assembled the crank.

He also etched the bottom of the barrels so I will always know which side needs the thicker base gasket.
AMcQ
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freeridenick
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Joined: Fri May 23, 2014 1:30 pm
Location: Derbyshire

Re: The RD400 drag bike

Post by freeridenick »

Great read Al. I can't wait to hear how it goes at a meeting.

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