Valve noise?

[CPC]

I just got a gasbike.net 66cc kit last week, and I have recently noticed what I believe to be the valves making some noise. I am wondering if this is normal. I was running a gas/oil mix @ 32:1 for 1 gal, but last night I upped it to 20:1 for a "just in case" safety net. Has any one else had this problem, and if so how do I go about fixing it if its something bad?

 

[MotorBicycleRacing]

I just got a gasbike.net 66cc kit last week, and I have recently noticed what I believe to be the valves making some noise.

Your 2 strokes doesn't have valves.....
It's a piston port engine

What does the noise sound like?
When does the noise happen?
Do you hear the noise when it is idling?
or under load?

Most of the noise on your motor comes from the clutch (right side) cover

Did you grease the gears in there?

I just got a gasbike.net 66cc kit last week,
I was running a gas/oil mix @ 32:1 for 1 gal, but last night I upped it to 20:1 for a "just in case" safety net.

How many miles or tanks of gas have you used?

32:1 for 1 gal is too lean for breaking the motor in

Did you use a richer oil mix to start?

 

[CPC]

ive listend and it sounds like its coming from the engine head....happens at high mid and high rpms.
I have never greased the plastic gears on the right side, I have been wondering it I should or not. the sound I think, sounds like valves pinging but if no valves cant be that. gasbike.net has been NO help at all.

 

[Mountainman]

those HT engines are known to be just a little noisy anyway

not to sure that I would even worry about it -- if it's running alright

and as our vendor mentioned -- grease that thing

ride the motor bike THING

 

[arceeguy]

At idle with the clutch disengaged, there is a certain amount of metallic noise coming from the gear cover area that is considered normal. Does the noise change under load? If you are hearing a "pinging" at mid-high RPM when the throttle is open, you could be hearing detonation (pre-ignition) from a lean mixture. Does the engine run/smell hot after you drive at moderate speeds for a while? Does the engine run better at 3/4 throttle than at full throttle? If so, you need to drill the main jet out to enrich the mixture at high RPM.

Also make sure that the noise isn't something on the bike rattling at a certain RPM.

Good Luck!

 

[CPC]

At idle with the clutch disengaged, there is a certain amount of metallic noise coming from the gear cover area that is considered normal. Does the noise change under load? If you are hearing a "pinging" at mid-high RPM when the throttle is open, you could be hearing detonation (pre-ignition) from a lean mixture. Does the engine run/smell hot after you drive at moderate speeds for a while? Does the engine run better at 3/4 throttle than at full throttle? If so, you need to drill the main jet out to enrich the mixture at high RPM.

Also make sure that the noise isn't something on the bike rattling at a certain RPM.

Good Luck!

I believe all of what you are saying is my problems. I tried bputting some cardboard on the clutch colver, but I did not notice a difference. Going to try some car stero dynamat and greasing the clutch gears today....least the grease. As to drilling the main jet, how do I go about doing that? My spark plugs are dry, but somewhat carbonated they dont look bad thoug Im getting new one today, hopefully! However my engine does not get hot....can usually touch it, its the exhust that gets HOT burns every pair of pants I own so far

 

[fetor56]

Try tightening the head,but NOT overtight or you'll strip the threads.HT heads have a BAD habit of loosening-off quickly.
If that's not the problem check to see if the exhaust gasket isn't leaking.
Grease the gears occasonally.

 

[CPC]

just got a brand new exhust gasket yesterday that is fine, also just had the head bolts checked @ the local motorcycle shop, there @ 12.5 lbs each. I did notice the chain tensioner is getting VERY noisy, but I can seem to get the chain tight enough to get rid of it completly cant get a 1/2 link anywhere here for my chain....

 

[fetor56]

just got a brand new exhust gasket yesterday that is fine, also just had the head bolts checked @ the local motorcycle shop, there @ 12.5 lbs each. I did notice the chain tensioner is getting VERY noisy, but I can seem to get the chain tight enough to get rid of it completly cant get a 1/2 link anywhere here for my chain....

Get a spring-loaded chain tensioner....Dirt Bike shops should sell them.

 

[CPC]

was just there DOH! did get some fiberglass muffler packing and good 2-cycle oil...oing back saturday and will try then thanks