Is this an install and forget it modification or should you replace key every year? Hearing a lot of pros and cons (performance increases and key failures) on the forums. Has anybody did a DYNO test with the timing keys?[img]i/expressions/face-icon-small-confused.gif[/img]

 

I am considering this mod a plug & play
since there is really no pressure on the key itself....IMO.....the crank shaft and the flywheel are taperlocked
I am not in the least worried about key failure....if your retaining bolt comes loose you are going to have
key failure no matter what key you are running

 

the key is there only to positionate the magneto, it does not hole nothing on this engine.

 

If the key is made rigjt you will not have a problem the machined down part must be just below the taper so the flywheel does not get hung up on the key and will not seat on the taper and shear the key in a short time

 

This has to be a major help in power (if needed) I raced karts and this is what you do in the Briggs class.You would not believe what an offset key did to a briggs 5 hp engine LOL
02 650 camo

 

Thanks Kawi, 03 TwinBullet and Reds650. Ordering the key today. Where did you get your flywheel puller and how much did puller cost[img]i/expressions/face-icon-small-happy.gif[/img]

 

I believe someone found one on Dennis Kirk for around $65. They want over $100 at the local dealership.

 

Dennis Kirk has them for $51.99 with shipping
1 800 328 9280
part # 28-1963
its a 35mm x 1.5
also fits mojave [my sons ride]
rejet if you want......I"ve been catching alot of flak on this subject
but I went up one step with the mains and left the needles alone
Happy Trails

 

when you can ck. your jetting by going a couple hundred ft full throttle and killing the ign. by pulling kill switch or shutting off key and check both plugs for color. you don't want black on the end and you don't want light tan. you almost want a light brown. do not let off on the throttle when you do this, killing ign.

 

Thanks Kawi & Schl48

I'll get one on order and double check my jets after install.[img]i/expressions/face-icon-small-smile.gif[/img]