what piston is this??? 200X

**OldSchoolin86** · 03-04-2008, 10:12 PM

Originally Posted by The Goat

93 should be fine...if you want you could add a little octane boost for peace of mind.

Should is the key word. 11:1 is right on the edge for an air cooled engine. It wouldn't be too hard to make it ping on 93 and you can toss that additive crap out the door too. Far better off mixing then wasting money on that junk.

**Dirtcrasher** · 03-04-2008, 11:03 PM

I'd go as close to 50/50 as I could myself.

I can read a plug, but I can't hear pinging on an small motor to save my life.

It's easy to hear an enclosed automobile engine when you lug it up a hill, but not so easy with these small single cylinder engines....

**NINJA** · 03-05-2008, 03:03 AM

If you are running a stock cam or a well designed mod cam, you're motor will do just fine on 93 with 11:1. I've had a few heavily modded 200X. Don't use additives.

**greenhuman** · 03-05-2008, 03:54 AM

That piston is a an old Helm and Son cast piston. They were 10.5 to 1 compression.

**3Wheelers4Life** · 03-05-2008, 09:01 PM

so now its a helm and son?
or is it an aries? thanks.

**greenhuman** · 03-05-2008, 09:38 PM

Arias pistons are forged and you will generally see some machining around the gudgeon pin area. Can you see machining because I can't. Its not now a Helm and Son. It always has been.

**3Wheelers4Life** · 03-05-2008, 09:56 PM

took a quick look, and cant see any machining that i can pick out.
Were there any specific marks that helm and son put on their pistons?
Where would I look, because I looked all over and the only mark I saw was “0.25” on the top of the piston?
by any chance do they still make them for the 1st gen 200X? thanks guys.

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