Registered User
New to the board
Is it possible to shave the head for better compression and snappy-ness? If so how much can I shave off? I'm rebuilding the head anyway so I figure while I'm in there why not? It's got a new piston an rings and what not already but I still feel like more could be done. Comments, advice, and what have you done similar to this? Thanks and happy riding!
Sent from my Z963VL using Tapatalk
Power User
Roostin Away
I wouldn't. I would just put a higher compression piston in it. But if you were trying to be cheap you could put it together with out a base gasket. BUT you have to make sure you have enough valve to piston clearance and head to piston clearance and you have a good cam chain so the tensioner can make up the difference.
If its on the internet its got to be true they can't put any lie's on the internet
Just Too Addicted
Arm chair racerJust too addicted
Not trying to be a jerk but what are doing with this trike? Racing it in an NHRA event?
Wiseco 10.25:1 piston
Webcam or Megacycle or someone on these forums to do some cam work
Port & polish
And if you want to go extreme get a big bore
That will be more than enough and it's been done many of times.
Got The Holeshot
Arm chair racerJust too addicted
I'm gonna agree with the above posts. If your gonna pay some money for machine work pay for porting or even a valve grind. Then get a bigger carb. It'll rip.
Sent from my iPhone using Tapatalk
Got The Holeshot
Arm chair racerJust too addicted
Go with the piston option. 350X's like the 10.25:1 piston.
YAMAHA 450 HYBRID
85 350X- RED
85 350x -BLACK
86 350x-WHITE (with Goki)
85 250r
83 atc 70
84 atc 70
84 atc 110
09 yfz 450
2006 Arctic Cat Prowler
RZR XP 900
FACT ! I have no edit button
Arm chair racerThe day begins with 3WW
No, plus machining the head like that will retard the cam timing slightly.Originally Posted by 4wheeltrike
PREVIOUS KAWASAKI INTERNATIONAL R & D PROJECT ENGINEER AND ATV DEPARTMENT SUPERVISOR AND THE ONLY PERSON ON 3WW WITHOUT AN EDIT BUTTON OR A STAR
Registered User
New to the board
Good to know thanks!
Sent from my Z963VL using Tapatalk
Roostin' Away
Arm chair racerRoostin Away
Why are you jumping back into the head after it just had the rings done?
What piston does it have in it? Heck it could just need a bit of time playing with the carb. Jet's etc to get what you are looking for. Post up what was done and and what it has as far as as jet's, exhaust, intake...
-------------------------------------------------------------------------------------------------------------------------------------------------------------------
'83 200X
Chicks love guys that ride trikes
Registered User
New to the board
Bought a fourwheeler with a 350x motor in it an a aftermarket slipon. Doesn't idle for crap(needs a carb cleaning) then found the valves were bad. Took it apart and noticed the piston was still shiny(no carbon buildup after wiping it off) and there was still cross hatching in the cylinder wall. Looks to be a stock type piston. Intake is literally just an aftermarket filter on the carb.
Sent from my Z963VL using Tapatalk
FACT ! I have no edit button
Arm chair racerThe day begins with 3WW
Most oversized pistons will have a number on top indicating the oversize. If it is a stock size, the bore may be tapered and/or out of round not allowing the rings to seat properly even though you see "cross hatch" marks in it, however, unless it is leaking a lot of compression, it will not dramatically affect performance. It is always a good idea to take a compression test before and after removing a head or cylinder etc. If the compression on most any engine is less than around 140 psi, it would benefit from increasing it if you want more power. If it is around 130 or less, it is really too low.
PREVIOUS KAWASAKI INTERNATIONAL R & D PROJECT ENGINEER AND ATV DEPARTMENT SUPERVISOR AND THE ONLY PERSON ON 3WW WITHOUT AN EDIT BUTTON OR A STAR
Reply With Quote
