Big Valve Heads worth the cost and trouble on 83cc scoots? By bigndum (Read 1,155 times)

[bigndum]

Just wondering if it's worth the $35.00 and time to install on my "100cc" (83cc) BBK scoot engine?

[jerryscript]

I used a stock head on my 83cc BBK for a year and a half, then one of the rocker arms pushed through the valve seat when I was going downhill over 45mph. Ended up dropping the intake valve into the cylinder, which left a nice hashmark pattern all over the top of my piston. Had to do a head replacement on the side of the road, and of course the new head had different rocker arms, so it took two trips to Scrappy's! The Vegas god's were on my side, since I was only 6 blocks away from Scrappy's when it happened.

I put Scrappy's performance head on, not the big valve head. I'm very happy with it. I cannot offer advice on the big valve head, but just wanted to share my experience with running a stock head on an 83cc BBK.

[bigndum]

Ok. Thanks Jerry. I've been considering buying one of those "Big Valve Heads" for my 83cc but I haven't found anything anywhere that confirms it actually does any good. I think because unless you buy one of the $129.00 big valve heads, there is no porting to back up the valves and so you really dont get any improvement just from the larger valves.

Would really like to hear from a few who installed them and positively DID get improved results before buying.

[Alleyoop]

Go read this thread it will hopefully answer your questions. Millsc has built MANY storming 50s and knows what works and what doesn't work.
Alleyoop

scooterdoc.proboards.com/thread/7383/mc-02-50b