TBolt USA is open and filling orders quicker than ever!
Email: contact@tboltusa.comText 704-826-5887Request a Callback

Welcome to the TBoltUSA Tech Database! To visit our store, click here, or use the menus at the top of the page.

Low compression and Smoking
TBolt USA Tech Database!


Pit bikes engines and most motorcycle engine will smoke a little at times
But when a constant and large amount of smoke is present the issue needs to be addressed

1) New Pit Bikes and Engines MUST be broken in with Petroleum base oil (non synthetic)

2) Used or Worn engines that smoke may be suffering from:
a) worn piston rings or broken piston rings
b)worn out Piston (yes a piston is a wear item and needs replaced every other ring change)
c)worn valve seals

3)Valve sealing surface
a)The valves may have excessive carbon build up allowing a leak
this can fixes by removing the carbon
b)The valves can be slightly bent , Replacing bent valves may cure the issue , But if the valve sealing surface on the head is damaged a valve job will be required and that is a shop job
c)A simple leak test can be performed by filling the intake or exhaust port with light oil or kerosene and observing if the liquid can leak past the valve seal

4)Make sure you have 110 in lbs torque on CRF50 Type engines Min on the Top head nuts


Pit bike Buying and Ownership info

Pit Bike Wiring Info

General Motorcycle Maintenance

Identifying Parts, Bikes, and Engines

General Motorcycle Troubleshooting

Pit Bike Installation Info

How Things Work

Parts Diagrams and Breakdowns

97 9