500 Two-Stroke Tech

Turns out that figure includes exhaust and carb weight (silly Japanese, go figure).
Motors difference is closer to 20 pounds. Measured it recently.

If the motor is factory stock 47X (Canada) or 51X (RZV) using all factory RZ500 parts (in particular pistons), the crank timing has been measured in my shop and found to be spot on. If a non stock piston with different pin offset is used, you can induce a change in TDC arrival relative to crank posi...

I would like to contact your seat repair guy. That's the best recover I've seen in a while.

If you would like to purchase an original, email me at rick@lancegamma.com and we'll work something out.

Pilot jet and air jet are two different things. You are looking for air jets that are m4 x .7 pitch thread and are commonly available in a range of .5 to 2.0. They are not pilot jets. The pilot jet range starts at 15, not 1.5 and go up to 40 in 2.5 increments. Pilot jets flow fuel. Air jets meter air.

She's a runner, too. I hope you enjoy it, buddy.

https://www.youtube.com/watch?v=hyDVwoAPlTU

That was when you were still running the modified stock air box. My carb mods with the TriPods are on it now. I assume it revs better (same as the street bike)? Thanks for noticing. I am a squid. Seriously I went over to the toll road and it was 100 outside. Was doing a carb comparison test on Ricks...

The fellow inherited the bike so had nothing to lose with selling it cheap. I suspect that he got tired of looking at a bike he had no interest in or connection with and took the money.

The pilot air jet (located offset from center at 4 o'clock) bleeds air to the pilot jet (no surprise there). It doesn't connect to the emulsion tube or main air jet. The main air jet resides behind the pressed in BB at the center of the bore at 6 o'clock. This circuit is cross drilled to connect to ...

If you need a fan in excellent condition, I have several. Contact at <rick@lancegamma.com>

Try repeating your tests with the fuel cap removed. You could be dealing with a bad vent in the cap. Depending on how much fuel is in the tank and the degree of restriction in the venting, the bike could behave just as you describe. The spark on the RZ is notoriously hard to observe on a good day. T...

Back on the floor would be as good a place as any. They aren't part of a 500 Yamaha (unless they are a crude aftermarket attempt at imitating an exhaust gasket). My apologies. I misread the scale. Glad to see you figured it out. BTW, please make sure that your chain blocks inside the swingarm are a ...

Gus, you may want to review what differences there are with the stock head gasket (front vs rear) with regards to regulating water flow. Not negating any improvement with your design but Yamaha made an attempt to address this issue with the gasket portals.

Stan doesn't do ANYTHING like this without getting paid. A fool and his money.... Vibration would be atrocious, even crippling. The ignition system would require Dr. Frankenstein's grasp of electrical nightmares. Do you think the clutch might slip a little? Carbs in the Vee as shown would have serio...

Having had cranksets from Gus in my shop, I can attest to the quality. They are first rate and every bit as good as brand new stock. Same with the seal kits. Great stuff. I would highly recommend their use.