new and have questions.

Ok so I got a motor kit given to me (used less than a month) and I don't know what size it is. I was told that the 48cc and 66cc have different head bolt spacing (1.75" in square and 2.5" X measured center to center of bolts) and should be able to identify it that way... Or do I need to pull the head and measure the piston diameter to find out?

So far I'm mostly happy with my bike. I pit the kit on a 2005 Schwinn Typhoon cruiser and total weight of bike/kit is about 60lbs... I'm 210lbs and with my gps showed a top speed of 27.2mph and accelerates quite well but when Im at wot and nearing top speed it starts 4 cycling which I beleave is caused by rich condition. I already cut about 1.5" off the stinger from the inside of the muffler cap (still just over 2" long) and drilled a 3/8" hole in the air box straight across from the carb. Which seemed to help a little. Oh my elevation is 1189.
Should I open the air box more to attempt to reduce the 4cycling more? And Or maybe miss with the muffler more (was thinking about cutting the stinger to just below the baffle and maybe drilling another hole or two in the baffle plate.)

I'm also wanting to try to hit the legal limit of 30mph (really would like to hit 35mph as most roads are 35) but I'm wondering if there's some simple/cheapish mods I can do to hit my goal. I was thinking about getting the head machined down a bit ( maybe .01-.02) to bump the compression and see if that gets me any closer to my goal. Is this a good idea?

A guy here in town suggested switching my 44t rear sprocket to 39 or 40t to get closer to 30mph bit said ill lose in the low end and to get a shop to extend the exhaust header a few inches to even it out. Would this work?

The fuel shutoff on the tank seems to leak at the lever even when the screws are tight. Think this is mainly in the off position. Do I need a new one? Or is there a way to fix this

As a final note I'm running slicks on my bike now as I had a top speed of 24.8mph on the old cruiser tires.

Thanks White Fire Tiger

And where do I get said exhaust?

wan37 said:

On the fuel valve put some white plumbers tape on the threads and then screw it in.The sprocket and sbp muffler would be the way to go.They also make a performance head for these things.Hope this answer some of your questions.

Click to expand...

It's not the threads of the fuel valve leaking; its the lever area. I have yellow fuel line thread tape on the threads.

I know where to find the sprocket but where do I get the sbp muffler?

Is like to get a performance head but Idk my motor size.

Thanks.

So how can I figure out what cc my motor is?

I know how to mill the head. But was wanting to wait till u have my car back.

There isn't any tags on the engine that id it.

wan37 said:

On most engines (not all) you can tell by the head bolt there either 6 or 8mm head bolts.

Click to expand...

Thanks ill try to figure out if they are 6 or 8mm

Is there a. Difference in the bolt spacing on 48 or 66cc?

Ok so today was good news followed by realy bad news.

Good :
Topped out at 29.3mph on flat ground.
This was after going ngk from champion plug.
Also figured out my motor is 66cc.

The BAD:
The seat tube motor mount bolt (left side) broke in half in heavy traffic at wot.

It's flush with the motor is there any way to fix this or is my baby done for?

Thanks.

I was just thinking I could drill and use an easy out.

Hope it works. But probably be a few days before I get it going.

I'll get to it in a few days when the rain goes away. I'm hoping for the best.

Just wish I knew why it happened so I could try to prevent it from happening again.

I had to do some work to get it mounted. If I can afford it ill get custom pieces made.