Question about the Head gasket

J

jyomaa

New Member
Just to give a little backstory, I had two previous kits (49 and a 66cc) and this was my first time mounting a kit to a suspension bike. I had purchased an 80cc /100cc engine with a high compression head. After mounting the engine and setting up the whole bike, I was relieved to see that my creation is done and all I had to do was crank it. When I pedaled the bike and let go of the clutch, my rear wheel starting skidding. After previous tries and tinkering with the CDI and clutch, I finally opened up the engine to see what was wrong, the cylinder head was too low for the piston to move up and down. I took some Velumoid (gasket material) to add two more gaskets to the head.

My question is after breaking in the engine, can I remove those two gaskets I had added to increase the compression over a period of time? or do I stick with three gaskets on the head for the whole lifetime?
 
If the piston is hitting the head that won't change after break in, the problem will be blowing head gaskets. Regular gasket material will fail fairly quickly I'm afraid.
 
jyomaa said:
Just to give a little backstory, I had two previous kits (49 and a 66cc) and this was my first time mounting a kit to a suspension bike. I had purchased an 80cc /100cc engine with a high compression head. After mounting the engine and setting up the whole bike, I was relieved to see that my creation is done and all I had to do was crank it. When I pedaled the bike and let go of the clutch, my rear wheel starting skidding. After previous tries and tinkering with the CDI and clutch, I finally opened up the engine to see what was wrong, the cylinder head was too low for the piston to move up and down. I took some Velumoid (gasket material) to add two more gaskets to the head.

My question is after breaking in the engine, can I remove those two gaskets I had added to increase the compression over a period of time? or do I stick with three gaskets on the head for the whole lifetime?
Click to expand...

I looked up Velumold gasket material at their factory and I didn't see any that were for making head gaskets.
A 3 pc head gasket isn't a good idea anyways

Instead of making the head gasket thicker Just use 2 cyl base gaskets.
And use one normal copper head gasket
 
Wrench I thought about that but wondered how much it would affect port timing, it may not make any difference. Hopefully someone that has done it will give us their advice.
 
wrench said:
I looked up Velumold gasket material at their factory and I didn't see any that were for making head gaskets.
A 3 pc head gasket isn't a good idea anyways

Instead of making the head gasket thicker Just use 2 cyl base gaskets.
And use one normal copper head gasket
Click to expand...

I stenciled out the outline of the gaskets and made my own gasket with the velumoid. I put 3 (including the original copper gasket) just in case if it was gonna start while banging on the cylinder head, my kit did not come with another base gasket
 
Greg58 said:
Wrench I thought about that but wondered how much it would affect port timing, it may not make any difference. Hopefully someone that has done it will give us their advice.
Click to expand...

For now, I'll just focus on the engine breaking in and see if the torque and max speed are gonna substantially improve after. it's running at about 45 currently but I have yet to push it to its very limit.

I'll see if I can remove one of those velumoid gaskets after it breaks in.
 
Greg58 said:
Wrench I thought about that but wondered how much it would affect port timing, it may not make any difference. Hopefully someone that has done it will give us their advice.
Click to expand...

Hi, just took my bike out for a ride today and it seems like it is banging on the head when it gets too hot, I could get it machined to have the clearance it needs with one gasket but I'm debating if I should do it or just buy a new head altogether.
 
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