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

Happy New year all! Smoke em' if you got em'! I still have an N.O.S. still in original plastic RZ350 injector pump waiting ....man. Wonder how many of those are left? G.F. still has an N.O.S. 75 RD350 tank in original yamaha box never used. The 350 is gone. Time will tell when she'll sell it! I'm no...

You might also want to check ALL the screws that hold the throttle cable (brass holder area) on the left side carb. Missing / loose screws can cause a weird feel like this. I used Loctite blue when I found that that area had loose screws. Also the brace that holds the (stock) carbs. Take a good look...

Here's some links that should help:

http://www.rzrd500.com/phpBB3/viewtopic ... +c3#p87967

http://www.rzrd500.com/phpBB3/viewtopic ... c3#p103094

The upward bend at the back makes me think j&r also. We have a 2 part set (uses stock head pipe) on the 350B A/C w/ the upward bend. Got a picture of the back and the perforated core? When I pulled the core out of the old J&R's it had very small perforated holes, if i remember correctly. I m...

I've done it a few times by taking a variable speed drill (makita battery powered) and a small drill bit to drill a hole (@ slow speed) in the old seal being very careful and not pressing too hard, so when the drill bit goes through you don't drill into the metal bearing on the other side. I drill 2...

I remember people jumping around from JJJ and JJH needles and maybe? trying to make a stock KX80? carb internals work. Been awhile. This scooter chart should help explain the needle profile and general jetting. If you can't find a needle to work (28's have a limited selection of needles compared to ...

Miss the EARLY springs in Cali. Seems spring in the PNW is 3 to 4 months behind by comparison. Use to ride the San Jose side of Mt. Hammy all the time, until moving in 2004. You do any recent runs to Skyline/ 9 / Alice's? Had a video done on 9 years ago. https://www.youtube.com/watch?v=w6THorwntcY i...

Premixing @ 24:1 has always been a safe ratio (good for high speed freeway cruising) for when I premix...you may have to rejet as necessary! I also like the smell of Redline Race Synthetic (very partial to this oil, when i could afford to run 24:1 in the AC 400F, it was definitely liking the high rp...

if the needle jet is clogged, all the fuel won't make it's way that blockage will keep the fuel from flowing....on the flipside, if the main is too rich, then it will misfire / four stroke and you won't have a chance to make top end, possibly only when it is cold for a short time, but then it will s...

I've always thought the DGs ran leaner on the mains than the toomey pipes. Never really found any solid jetting advice for DGs. I suspect and highly recommend changing to old school or new toomeys. I wasn't satisfied w/ Spec II pipes on the RZ either. I did find one post on a banshee forum where a g...

loud knocking noise at idle. <--our crank is wasted. I've heard from all on this board that a NEW crank is the way to go. Will go that route. Probablem is the pin is not replaceable like a 400 / 350 crank, could be a loose fit after awhile. Fresh crank, tight fit, all new parts...sounds good to me. ...

Not at the flange where it (header) mounts to the cylinder or (pictured) where it mounts to the end of the expansion chamber @ exhaust end (that's a banshee T5 can i think).... see image (below). http://i160.photobucket.com/albums/t163/holypiston/2017%20photos/2toomey_cans_zps9hchet8n.jpg CORRECTION...

The o-ring I measured is the stinger tip (end cap) o-ring at the very end (snap ring holds the aluminum tip in place @ exhaust exit. My measurements: 1.958" ID X 2.280" OD X 0.135" Width. The closest I could find was #226 Silicone O-ring @ McMaster-Carr for $9.64 (10 pack). Might be w...

I would take your next bore job seriously and find another verified 2 stroke cylinder bore guy (ask the forum...take this seriously!). Find a reputable 2 stroke bore specialist. Sounds like the mechanic's friend might be an automotive type bore guy and things can catch if they don't chamfer the port...

I agree with Evan, poor starting is usually a clue to low compression on an older motor. 3rd. Both our RZs have close to 30k miles. One would take about 50 kicks to start. The other about 15. Cold starting. When warm about 3 kicks. Very tired motors that need complete rebuilds. What is the mileage?...