Really high idle fix

[Mike Cyanide]

Apologies for the late reply.

Unfortunately the Reed valve didn't have enough clearance to fit. Instead, I chopped off the intake as much as I could.

I put a short plug in from my chainsaw, I'm not sure if it's the same one you said, but it had a .7mm plug gap. About half throttle it would start to 4 stroke. Then I bought an NGK B7HS and it stopped hitting. Turns out the original spark plug was trash. Who knew.

Haven't started messing with the jets yet since all the big issues are delt with, but that will be next on my list!

No! Not the plug gap the SQUISH gap. How close the piston comes from the head! The plug gap is like. .28

 

[Mike Cyanide]

Apologies for the late reply.

Unfortunately the Reed valve didn't have enough clearance to fit. Instead, I chopped off the intake as much as I could.

I put a short plug in from my chainsaw, I'm not sure if it's the same one you said, but it had a .7mm plug gap. About half throttle it would start to 4 stroke. Then I bought an NGK B7HS and it stopped hitting. Turns out the original spark plug was trash. Who knew.

Haven't started messing with the jets yet since all the big issues are delt with, but that will be next on my list!

Sorry for that mix up. Lol it happen but I was saying you had to make sure the piston doesn't contact the head. If your safe there yes a saw plug will work.

 

[Yountz]

How do you measure the squish gap? Or is it a spec on the plugs? I did install another base gasket to be safe also, no effect on the compression though.

 

[Mike Cyanide]

How do you measure the squish gap? Or is it a spec on the plugs? I did install another base gasket to be safe also, no effect on the compression though.

No, super easy,get some super thick solder or take some reg solder and braid into a wire then remove spark plug and take an L shaped peice of solder and hold it to top of side wall in the cyl roughly where wrist pin is for accuracy. Then spin the motor by had til it pumps a few times crushing the solder. Take a dail caliper and measure the smallest point. Squish gap= how close piston comes from head. 75mm is optimal. However I only have a standard dial caliper so on that it should be no smaller than .025ins.

 

[Mike Cyanide]

How do you measure the squish gap? Or is it a spec on the plugs? I did install another base gasket to be safe also, no effect on the compression though.

And its impossible to install another base and not lose some compression. Your making a larger squish gap by doing that.