RZ/RD 350 & Misc. 2-Stroke Tech BBS

I'd also look at your exhaust ports while the pipes are off, no doubt they will be thick with build up. If your plugs are black I'd clean your air filter, pull your carbs, check jets are correct, reset float levels consider lifting your clips one notch and rebalance your carbs. Not getting above 600...

Wank, the last 20 years, horse shit. Let him min another 6 word championships then put him up there with Rossi, Aggi, Dohan.

The bike looks good Graham and you have the basis for a solid bike with the crank work and pipes. Going back to OEM reeds that seal properly was a good step. On this subject RZ 350 OEM reeds are larger and can be made fit with a hand machining with a file if you ever have the top end off in the futu...

More referring to the outside casting Water pump outlet.

Nice job Jon. Pay attention to the cast floor on the right side case water pipe, I just finished an lc 250 engine to add to my lc collection. Yamaha have a casting join point line on the horizontal plane that is worth a round off with some emery.

Reading your blurb I would have came to the same conclusions. Double, triple check your pilot jets. Blow them out with air or aerosol CRC lube or something like that. You need to see that they are not blocked. It does not take much to block them. Are you running an inline fuel filter, if not I would...

What flat slides are they? The original 26mm round slides are crap. Good bottom end is useless. You are setting up a race bike. You want good top end to be at the pointy end of the field. DG pipes don't have a good reputation as race pipes. You have probably never experienced tuning a 421 engine, i...

I recently converted my 421 lc aprilia from the standard lc bar set up to Standard zrx1100 bars, right master and mirrors. Ist perfect. Slightly wider than lc so but not as wide as motorcross bars, very similar pull back so no undue discomfort on the wrists and the height is spot on. Slightly higher...

Agree whole heartedly with Trex
The VM26ss carbs properly jetted on the mains and needle will suit bikes up to 421 with the added bonus of retaining good bottom end.
If your in the US get a set of TRUSA pipes, if in the UK buy nothing but the best Kenny Gibbons TSA pipes.

Check your squish if your not below .9 mm then Set your firing point with a dial guage at 1.8 before TDC. Period. Check with a timing light when your done.

Variables in timing position. Carb balancing. Float level heights. Main jet sizes. Oil pump setting. Air settings. Slide wear in the carbs. Their are quite a few variables as to why one bike could be tuned slightly different to the other. Besides porting reeds and squish volume. PS if the piston cro...

It gets more difficult the larger you go on the Cs or the more performance mods you do. For example my 421 has to run a larger than expected pilot just to feed it when off throttle at higher revs, otherwise you have a rodeo on your hands. As a result the static idle is pretty wet. Hence tuning has t...

The needles for a vacuum system are different than a non vacuum petcock system. Anybody that has their stock RZ carbs that uses a vacuum petcock out of the bike, clamp them in a vise and hook up a test bottle to them and hang the bottle above the carbs. Report back to us what happens after about 3 ...

I just re read your post, you have new needles and seats already I see.
Go direct to step 2, clear line check on the bench and adjust the tabs accordingly.

What the other guys say It's your needles and seats, I'd get two new sets. before refitting the carbs make sure your float levels are exactly the same, do this on the bench using the clear line method from the carb drains run vertical up the side of the carb, then adjusting the float tabs stopping t...