LT80 upgrade

[smr]

My son has been racing in the stock class for a couple of years. He is really starting to dominate at our local mx track. I decided to move him up to the modified class. I bought a header but have not done anything else. I have the motor took apart and was gonna have it bored out. I have also heard you can do some clutch mods to help out. What about converting to premix? Will that help with performance? What do I need to do to remove the electric starter and git rid of the heavy battery? Any advice or suggestions would be appreciated.

[ss440ex]

These are questions you need to ask Jack..aka (lt80)
He`ll fix ya up!

[LT80]

Boring gives very little gains.
Porting is where rpm's/HP is made.
You need to stop and educate yourself on LT80's before you waste a vast amount of $$$.
Going to Pre-mix is a good thing for long term as the pump will quit someday and cause a failure. It's not a performance thing.
Clutch mods are not done till there is a motor to push them.
Whether me or someone else builds your motor, have one person do it so the motor and clutchs work together.
So what pipe did you get?

[smr]

DG pipe

I have replaced the clutch in the past but I put it back stock.

I currently have the motor apart as he has broken an engine case. (this is the third one....we are averaging about one a year)
This will be his 4th year of racing and we have always ran the stock class.


The motors are simple to work on but I have no idea of the proper way to up grade.