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I took a 65 mile ride yesterday for fun and to test out the mod I made to my clutch bell where I cut some slots into it.

The weather averaged 95 degrees and my scooter held up well without any problems.

In the description in the youtube vids towards the bottom is where I have all my listed mods I have on my scooter for this ride.

Here's another chart.

www.4secondsflat.com/plug_chart.html

I appreciate the kind words. Thank you very much!

I almost got the 18/36 gears but am happy that I chose the 17/37.

Beware though that the only place I found these high of a gear ratios were on ebay from someone named autotech335, or something like that.

The big gear I got from him wouldn't slide onto the shaft like the stock one does. I had to carefully grind inbetween the teeth a little to try to get them to fit. I managed to slide them on 3/4 of the way but I had to tap it in the rest of the way with a hammer and punch.

But upgearing is the way to go. All these scoots come with the same gear ratio regardless of tire size so there are some gains to be made.

Another thing you can try is pop the valve cover on and start it up the way you have it now. The engine should start even if the timing chain is off a tooth.

The first thing to look for at this point is to see if your engine starts up right away or not.

After start-up, get your engine hot while its on its center stand and after its hot, rev your engine high.

If there aren't any backfires or hesitation, then your timing is ok. If there is backfiring at full throttle or close to full throttle, turn the engine off and go have a beer at this point so you could let the engine cool down. Then pop off the valve cover, chain tensioner and camshaft holder and move the gear up or down.

Then do the above steps again.

This happened to me recently where I was off 1 tooth on the Cam and my engine would backfire at the intake during full throttle.

I had the same problem as you.

It would drive me nuts because no matter what I did, the oil leak would mysteriously reappear. It wasn't until I decided to rebuild my top end that I discovered the crack on the side of the cylinder head.

The worse part was that I didn't discover the problem until I had my engine all put back together because I only replaced the cylinder jug and piston at first. I tried to put some JB weld on the outside of the engine where the crack was because I didn't know the extent of the crack inside the cylinder head. I put the engine back on my scoot but the oil leak reappeared so I ripped my motor apart again and the crack that's in the pic is what I discovered. I had to order another cylinder head and install that.

I hope this isn't the case with your motor but I wouldn't rule a thing like this out since the symptoms that you described is the same condition I had before I discovered the crack.