Drag Porting On a Trail Bike ?! Will it work?

[Skeldaw]

Well it's not for me, I just want to know if he will be able to run this porting on a stock 350 for trail riding, If his banshee will still be reliable and run great

[Deadbeat]

its got boost ports, how much did your bro pay for those?

[Skeldaw]

70$ for those cylinders

[oldskool]

Your gonna have to determine what you guys have. Measure the bore. Its going to take a 68mm bore to get close to 400cc with stock crank. Then measure from top of cylinder to bottom of transfer. Should be 54mm for stock crank. I wouldn't put this together until you sort some things out

[Skeldaw]

Your gonna have to determine what you guys have. Measure the bore. Its going to take a 68mm bore to get close to 400cc with stock crank. Then measure from top of cylinder to bottom of transfer. Should be 54mm for stock crank. I wouldn't put this together until you sort some things out

Well he want to re-sleeve with stock sleeve to be 350 and run those porting

[oldskool]

the porting will be what ever the sleeve is, not what the cylinder has now. IDK   good luck with the build

[trickedcarbine]

Those are salvageable. Definitely. Don't worry about them going down to 350 CC. The more you feed any motor the better. I was picturing razor thin intake bridge and hogged out ports every where. Tell me.... Are there ports cut in to the liner adjacent to those boost ports?

 

Forgot to mention. Just make sure you port match smoothly

[camatv]

one guys "drag port" is another's trail port.

 

looks to me like the cylinders need checked out by some one who knows what they are looking at.

 

i "trail rode a 85hp motor and a 100 hp alky engine.  neither were very "fun"  they were more terrifying than anything.   i kinda liked it.