There's something wrong with your primary if you have the short spring in, tip weight removed, and still seeing 3500-4000 rpm egnagement. First thing is, it doesn't matter where the belt sits in the secondary, that's a useless way to judge belt tension. Adjust the belt tension until the car...
How tight is your belt? Belt deflection will affect how/when everything moves. It'll never be like a golf cart, a golf cart uses an electric motor to spin the engine and then a clutch with no spring when the engine starts moving, that won't work with this power plant, because as soon as you'd...
Removing the rivet closest to the heel will not bring engagement down, that will actually raise engagement. If you want to bring engagement down, remove the tip weight (furthest out from the pin). This will allow the weight to swing out sooner and engage at an earlier rpm.
If the engine has been overheated, you can have aluminum that no longer is strong enough to hold threads. I haven't had this happen on a Sidewinder, but have had it happen on a Polaris Ranger 900 before, I even had the standard helicoil pull out after installing them, the aluminum was that...
There's some good information in these MPI instructions (as well as pictures). It's talking about supercharger, but boost is boost. You need to boost reference the bowl vent tubes & the slide tubes as well so everything works properly...
Again, Yamaha 90501-550A2-00 start rate is going to be the lowest spring available from anywhere. DO NOT start changing weights & springs all at the same time, because then you don't know what did what. You may have to go to the Yamaha short cover springs, inside of the long cover primary...
Get a Walbro GSL392 pump, use a relay to power the pump from the battery and use the fuel pump wires to activate the relay. You'll also need an adjustable fuel pressure regulator as well.
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