I have an engine I got used, and the id sticker and metal plate with engine specs and clutch arm are gone. Is there any way I can identify it? Are there any external or internal marks distinguishing a GT5, GT5A, or GT2? The engine is not very old, but eventually I will want to replace piston and or rings modify the engine.
engine I.d.
- Thread starter hcrft
- Start date
MotorBicycleRacing
Well-Known Member
Post a pic.
There are only 2 kinds of 47 mm pistons but the rings are the same for both.
GT 2 is 48cc GT 5 are 66 cc
Awsome responce. Well now I know its a 66cc. Should I remove the piston and post a pic? I know that you can also measure the piston to find out specifically what piston you need. I just don't know where to measure. I know the pistons has different parts like escort and 4. But I don't know the anatomy of a piston where to measure. I'm glad you gave that advice because I also have a nother barb working little engine I picked up on a used bike that can probably use new rains. Kinda reminds me of a PK80 but I'm not sure. Being able to measure the piston would allow me to find a replacement also. Thanks again for your advice. I will wait for your reply before I the engine apart.
MotorBicycleRacing
Well-Known Member
No need to pull the motor apart.
Just make sure you get a GT 5 piston which has the high wrist pin location.
PK 80 style pistons have the lower wrist pin hole.
Just make sure you get a GT 5 piston which has the high wrist pin location.
PK 80 style pistons have the lower wrist pin hole.
MotorBicycleRacing
Well-Known Member
Just make sure you get a GT 5 piston which has the high wrist pin location.
PK 80 style pistons have the lower wrist pin hole.
MotorBicycleRacing
Well-Known Member
PK 80 on the left of the GT 5 piston.
copmagnet80cc
New Member
what are the specs for the PK 80 piston and GT 5 piston?