My scooter has been having running problems just before it hits the power band...

[price.is.right]

I have a 2003 Vento triton 50cc two stroke scooter that I just upgraded to 70cc with the MHR kit and I upgraded the carb as well (21mm). Before I did the install is was having some running problems (the same it has now). Since then I installed a new 70cc kit and new carb and new variator. The problem is as follows:
When I start it, it idles fine. Then when I rev it a little it bogs down just before getting into high RPM's and hitting the power band. After this happens, it idles a little higher and the idle isnt as smooth.
I know this isn't a fuel mixuture problem or pipe or carb problem either. Would it be possible that there is a crankcase leak? My assumption/ hope is that it is the crank seal.
Any comments or suggestions would be appreciated.
Thanks,
Bill

[price.is.right]

http://www.provoscooter.com/vbull/showthread.php?t=2040&highlight=crankcase+leak

same issues that were stated in this post.

idle is ok, but it will bog like hell when given gas.

any ideas?

[mikal]

You could do a leakdown test to see if you have air coming in or out. Or you could
spray wd-40 around the area to see if the RPM's climb.

[price.is.right]

how would i go about doing a "leakdown test"?

[Lennox]

how would i go about doing a "leakdown test"?
http://provoscooter.com/vbull/showpost.php?p=106085&postcount=31

[price.is.right]

thanks... any input on how long it would take to disassemble/ reassemble crankcase?

[price.is.right]

http://provoscooter.com/vbull/showpost.php?p=106085&postcount=31

ok, so I am confident now that i will be able to do a leakdown test. the last thing i'd like to know before i start is do i need to plug the intake and exhaust?