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So, one of the rd400 engines that I have came all apart when I purchased a complete rd400 barn find with that extra engine. The parts are all there, but the crank has a bad rod bearing. Assuming that the crank needs rebuilt,
If 110mm rods are used instead of 115mm rods, could we then use the OW31 top end without a spacer?

The 400 crank still has a different stroke regardless of rod length. Why not use the R5 bottom end? I'm sure the 400 bottom end could be made to work with the correct spacer plate, porting changes, etc, but why? It works perfectly on an air cooled 350 bottom end. It works even better on an LC bottom end because then you have the built in water pump you don't have to think about.

I'd go water cooled. I'd take your R5 cases and put one of your RD400 transmissions in it and then I'd port the shit out of that OW31 cylinder you mentioned, get some giant carbs like I mentioned before and have some pipes built that give you the power delivery you need for drag racing. The reason I'd use the R5 cases is because that TZ cylinder will bolt right on and no rod or stroke change is needed and no spacer plate needed. Blaster reed cages fit the TZ cylinders perfectly.

I'd use the motor I have but only more heavily ported with 40 or 42 lectrons or a heavily built banshee motor at the max bore size and still be under the class limit, also with giant carbs.

I have a TZ/RDLC motor in one of my street bikes and I love it. Runs awesome and makes really good power. If you are looking for power though I'd bet Teazer is right about using an RZ or Banshee motor, but in my mind there's just something about the "TZ" part of it that's just really cool.

Sorry I saw posts saying Gary was making pipes. I didn't see any contact info. Anyone have a number etc.. Thanks

Pretty sure this is still his number 747-257-5129

I think the top one is Cal-Fab.

do you have 190s? try those 1st. 

^^^^^^this^^^^^^

That has to be a joke

I also just run straight pump gas in my TZ. I just buy the highest octane that is available wherever I happen to be. FWIW, with new rings my motor has 160 psi readings and the head still has the original design combustion chambers. I would not use octane booster either.

You have to cut the stuffers off to use V-Force reeds.

That seems like a fair price too.

What 2 Smoker said "it makes me smile just looking at". That is a beautiful machine. With lots of awesome bits and bobs.

It looks like a custom air box under the tank, or is it an oil tank?

It's an oil tank.

I love that bike.

Thanks

Makes me smile just looking at it, are those custom made chambers.

They are Swarbrick chambers. They are built for that engine and frame combo (sort of) but I changed them a bit by cutting and rotating the rear convergent cone to give them a more up swept look. They come mostly welded together but the brackets are left off and the stingers need to be cut to length and welded in place. I went with the stinger mostly internal. According to Swarbrick the stinger length and internal VS external mostly affects top end and the noise level. I did it purely for the looks.

This thing makes me smile every time I ride it, especially after not riding it for almost 6 months.