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I'm fine tuning the vm36's on my 650. It runs fine and starts good but is a little rich at idle. I have two sets of carbs from 650s to scavenge parts from plus my jet box. Anyhow. The needle jet in the bike is a 0-6 and the spare set has Q-5. Are the 5's leaner? The needle on the bike is 6h9 and...

While digging through some scrap engines. I found a 650 engine with s 650 in the serial number. The rocker cover for the decompressor is missing so that's out as a way to check. Is this a 256 type engine? Looked around online and it seems like it might be a early one. Thanks

Since l finally put my flattracker together it' kind of lit under a fire under my ass lol A Anyhow is there a general rule of thumb for type of exhaust system? We race in vintage 1/2 mile flattrack. At the last race we had 4 yamahas and 4 separate types of pipes lol

Hi l have a 73 650 engine in a flattrack frame. We're running a stock dual points ignition into a single 4.7 ohm harley style coil. The bike seems to work fine. We wired it with a condensor for each set of points using the factory wiring. All the diagrams l see on here just show one. Are we...

Just thought I'd give a quick heads up to anyone in Southern Ont that had trouble finding a 1 and 53/64 frost plug. After I searched high and low(napa,uap,apc,carquest, etc) for the proper plug using the dorman #555-083 my local APC dealer cross referenced it to another local Carquest under the...

We have a 73 650 with the twin throttle cables. We put on a set of carbs (twin cable type also) They have a round venturi as opposed to the original style that had a hump on the floor of the carb. We thought they came of of a tx750 but now I'm not sure. In any event they worked fine with a 2-1...

We took the 650 out for a little fun on Sunday. It worked o-k other than being too heavy and the bars being too low.