Case porting?

[ShreddinSD]

Exactly. Kawasakis have a small deep dome. It would take a piece of ring or something like that hitting it in order to close that gap. I had no loss in performance after that would happen. That’s why I was thinking possibly extreme heat and vibration, but I’m not doing anything that thousands of people haven’t done before right? I put a head gasket in and that problem ceased if I remember correctly. It’s dawning on me now how much effect that base gasket would have on calculated compression. The difference between an .050 and .020 base gasket would be close to 1.5cc

So I suppose the OE CDI could only be using say, 9V to charge the coil whereas the Zeel uses 12 or something along those lines? There must be a lot of potting in the oe CDI or not much in the Zeel, or both. I guess components could all be close to the same size if only voltage was increased. Now then, if there is more voltage or more current arcing, how does it not change the heat of the spark? I am stoked on the Zeel and can’t wait to get it on the water. I was weary about MSD or total loss, would love a light flywheel but think I will be happy with the Zeel and Lightened stock wheel.

It is a total drag dealing with the quality of fuel nowadays, especially in California. I would assume that we are more heavily regulated and cutting our petrol with fermented corn or some other rubber rotting, moisture absorbing mierda.

 

[ShreddinSD]

I found a thread on my SP issue:

Being that it’s on an X2 and has been the rear plug perhaps I was partially cracking them when installing- or a possible flaw that NGK quickly fixed

 

[JC-SuperJet]

A Friend's 750 X2 had the Rear Spark Plug Porcelain cracking every time he rode. Never the Front one. Both Cylinders even Compression. No Air Leaks.

Until he noticed that a stream of Water from one of the Top Deck openings was splashing on it. He sealed the opening, problem solved.

May have been the Hole/Grommet where the Wires and Cables from the Handlebar go thru the Top Deck.

 

[Baja 252]

Our 1100 SXR has a ported cylinder and runs great. I'm curious how much additional power I might get if I had the case ported also?

 

[Storbeck]

I think the whole thing about tight squish causing detonation is from two things. One, people do it by cutting the head so they are both tightening squish and increasing compression ratio. Two, tightening squish increases squish velocity, which speeds up the burn rate, which then needs less ignition advance. Tighten squish and an ignition curve that was fine before might have too much. It's not because the squish is causing any issues, it's helping you because you can run less advance.

 

[waxhead]

I think the whole thing about tight squish causing detonation is from two things. One, people do it by cutting the head so they are both tightening squish and increasing compression ratio. Two, tightening squish increases squish velocity, which speeds up the burn rate, which then needs less ignition advance. Tighten squish and an ignition curve that was fine before might have too much. It's not because the squish is causing any issues, it's helping you because you can run less advance.

Spot on, tightening the sqush stops over rev. why because it acts like advanced timing. If you have a zeel and tighten the squish the stars aline

 

[ShreddinSD]

Thanks JC! that’s exactly what’s happening. It’s either coming through where the boot is or dripping off the steering shaft! It hasn’t been happening recently but now I know what’s causing the broken plugs…

Trying to wrap my head around the dynamic squish concept…I get that too tight of squish could cause deto due to heat and compression right at the pinch point at the edge of the cylinder. Wouldn’t it be hard for me to get too little squish since the slugs in Kawi s are 1.4mm below deck height? Is squish velocity how much clearance decreases as revs increase? I gather that people on here would recommend using a computer rather than the Zeel handheld programmer? What would ideal squish be on this engine with 26cc domes? (22 casting)

Wax, it sounds like you would recommend raising exhaust ports on my next build (BP, 30 casting, 82.5 bore, 26cc domes) and running exhaust hot for high mid to high power? I do some flat water but would rather have it hit when I send it off a wake at the moment. Not too much desire for top end since I’m kind of over biffing it at 50 On my x2. I’m running a hooker 9/15 now and also have a 12/18

 

[waxhead]

To tight a squish will not cause deto. You cant detonate what's not there, however because of the turbulence it creates in the combustion chamber it makes for a faster burning mixture which acts like advanced timing. turbulence is a great thing by the way