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  #21  
Old 02-09-2023, 01:49 PM
swazi_matt swazi_matt is offline
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There are a few posts on how to do a squish test. Maybe try that and report back on findings
As you are wanting to ride on the road it may be a good idea to do this anyway and possibly get the head shaped correctly for squish


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  #22  
Old 02-09-2023, 05:58 PM
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Std bikes (only measured my 200 and 300) are often about 2.5mm gap so don't be surprised if on the first try you need to double over solder..
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  #23  
Old 02-09-2023, 06:10 PM
Noobi06 Noobi06 is offline
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this shit looks complex asf. is there an easier way? I thoguht it would be ring end gap or too small of a piston

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  #24  
Old 02-09-2023, 06:28 PM
Noobi06 Noobi06 is offline
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I did actually notice the previous owner had 2 gaskets, while I only had 1. Maybe I add the other one back?
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  #25  
Old 02-10-2023, 03:17 AM
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What's complex about shoving some solder down the plug hole?
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  #26  
Old 02-10-2023, 04:25 AM
fred99999au fred99999au is offline
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Not experienced with the GG engines, but I find that odd. Most of my other 2 bangers have the piston reach very close to the top of the cylinder and the compression space is in the cylinder head.

Hence the difference in head shape and CR etc.

What has changed in the bottom end? It is either going to be cylinder height or crank throw that makes a difference.

What base gaskets have you used?
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  #27  
Old 02-10-2023, 06:03 AM
Noobi06 Noobi06 is offline
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The previous owned had 2 base gaskets. I only use one now.
Before that I had another cylinder that had really high compression. I guess I will just do the solder thing
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  #28  
Old 02-10-2023, 06:12 AM
Noobi06 Noobi06 is offline
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if the squish is too bad, do i need to cut the bottom of the cylinder? Thats not something I can do myself either way
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  #29  
Old 02-10-2023, 01:28 PM
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Just make sure it is as good as stock and nothing is wrong or mismatched.

Yes, ideally on a 125 0.8mm would be a better number. 1mm on a bigger engine. You'd skim the head to reduce the gap. But most often closing the gap up will make the compression ratio too high and detonation will occur. Unless you make the chamber of the head bigger.

Let's not get into that, our lad here is trying to get the bike running best it should for an affordable price.

Btw both my 200 and 300 had two base gaskets std. I took one out on the 200. Lower barrel will typically give a little more low end. That is broadly speaking, very generalized.
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  #30  
Old 02-10-2023, 01:37 PM
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If the squish is too large, you can either reduce the base gasket thickness, cut the cylinder base so the overall height is shorter or cut the head mating surface in a lathe so the head protrusion goes deeper into the cylinder.
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