Wrong wrist pin and no engine numbers - some real fun stuff

[Abbring]

Hello,

Thanks for the read. This is not a fun problem to have and could really use some help.

I purchased a 160cc 59mm big bore kit for my "150cc" moped from scrappydogscooters and the tech sent me to this forum, I have an anomaly for a moped.

Here is the problem:

I tore the top end off to install my new big bore and found out that my engine has a 13mm wrist pin and not the common 15mm wrist pin. (did not measure just assumed from other forums I read) Picture here: http://img15.imageshack.us/img15/2510/connectingrod.jpg

The second problem is there are just engine numbers stamped on the case and not the engine model numbers above them. Picture of this is here: http://img40.imageshack.us/img40/4159/enginenumbers.jpg


Additionally, I have included a picture of the pistons side by side to show the huge difference in size: http://img685.imageshack.us/img685/2970/pistonse.jpg

It seems to me that the difference from a 150cc piston to 160cc is about 4mm...it looks much bigger than 4mm.

Anyone have any ideas of the following:

1) What is the Correct Big Bore Kit, and where to find it? (I have horrible compression from tearing it apart and reassembling without a honer/fresh rings)
2) If there is not a big bore kit available, where can I find wrist pin adapters to go from 13mm to 15mm? (Is this even a good idea??)
3) What is the actual size of my motor?

Additional information that might help:

Make: KAITON
Type: PSMC
CASE: LONG 18"
TIRE: 12"
Model on Bike: MC75-150
Year: 2010


Thank you for your response in advance. We just moved to Hawaii a few months ago and this is our only means of transportation to and from work.

Thanks!

Derek

[charlie55]

Since this forum is mostly dedicated to Genuine products, it might not be the best place to obtain answers for your scooter's problems.

Try http://scootdawg.proboards.com/index.cgi

There are tons of folks there who are very knowledgeable about Chinese-made scooters, and who could probably answer your question in no time.