4 stroke Flywheel key mod

Quadmaster

Has anyone done this mod ?? Does it work ?? Is it worth the cost and time?? I've searched this forum and cannot locate an answer.. I would believe it advances the engine timing and thus would increase bottom end, however it would in turn hurt top end although I don't know its noticeable...wink:

BGW

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ruredy

It is done on the vtwin engines but is fairly pointless to do on the Robins engine cause of the rev limiter

pizzamaker

the reason the key mod won't work on the ez go 4 cycle is that the key is only 0.120 thick leaving no room to mill!

pizzamaker

the only way i found to change the timing [with out spending 500.00] is to mill the mounting boss back were the pulser coil mounts and making a plate with slotted holes and moving the pulser to get your timing ajustments,

todwil

I did this by filing the the brotched hole in the fly wheel you dont have to do much just a couple of thousands of an inch only know this because I went
to far the first time!!!

Quadmaster

Tod how much do you think it helped??? Is it one of those things that by itself is not a big deal but with other mods help in the total outcome ???

todwil

I found the ignition box from a '91 that didnt have the rev limiter
plus it was a 350 with a 295 head with aperformance cam and a
bigger carb so it help a little!!! I dont know the gains if any on a
stocky!!

Quadmaster

Tod Thanks, Mine is a 92 350 with no rev limiter and I'm planing on a 295 head as soon as I get the money.... ( u know time & money = u never have both ) .....
You talking about a torque cam ??? How much bigger a carb ??
Did you have a stock exhaust ??

Goat53

In the lawnmower engines we used to run advancing the briggs help top end but hurts torque ,, and retarding the flywheel helps torque and hurts rpm ,,, the engines use the same key as the 5 hp go cart engines , unless you are running hi performance parts all the way the difference isn't all that noticeable , because it usually shows up at the top and you usually have to let up on the throttle before you top out ,

todwil

Quadmaster heres a pic of the Onan carb I used I chose this
carb because of the needle jets=endless adjustment!!!! The carbs
dirty been sitting in box on the floor in dusty old Yuma



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