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Can also machine the 701 ada domes on the lathe to accept the 84mm or larger bore. Cost is $12 each. Much cheaper then buying new domes. Just FYI.

I've bored dozens of 61x cylinders to 84mm. So has @powerhouseperformance I know for a fact.

Evo is WAY shorter then sj. Weight is similar but ski is almost 10 inches shorter overall. Only a 1/2 inch longer then an xfr. I have pics to prove. ..... Front Back Sj is I believe 87 inches Evo is around 78

@speedysprocket gets all my flywheel lightening work these days. My customers and I have never been happier. Chuck Palmucci CPT Enterprise LLC 609 510 3062

My comment wasn't meant to insult you in any way. It was to clarify further from your post. So people who browse this now and later through the search function have an understanding of why they would need to run different domes on same brand cylinder with different displacements. Again I don't...

Displacement effects compression ratio Static compression ratio: 850cc with 44cc domes= 9.5:1 1000cc with 46cc domes= 10.5:1 Dynamic (trapped compression ratio (with PV open/approx exhaust port opening @ 84ish deg atdc) 850cc with 44cc domes= 5.9:1 (perfect world compression test about...

That close up of the bore shows it is in need of some attention. It appears to be out of round. I'd suggest checking with a bore guage if you have access to one. There are areas the cross hatch is still mint from the last hone and areas that is totally gone. A ball hone will make it all look...

well crap how much for either or both of those systems? Mechanical injections is something i have a lot of experience with just not in this application

Few things to consider. Older xscream pistons use the larger seadoo 951 wrist pin diameter and should use oem seadoo cage less wrist pin bearings. Newer xscream 865-900 SS pistons use the smaller wrist pin and should use OEM honda CR500 wrist pin bearings. If you bought an after market crank and...

BUMP come follow us

Yamaha calls it driveshaft collar for some stupid reason. Many call it a seal collar or repair sleeve. Yamaha part number 62T-45526-00-00 $20 bucks online or $25 retail I wouldn't bother with a used one. Heat it up for install and use some green 620 locktite so it doesn't come off again...

Why are 1400 rpm missing from 5500 - 6900?

Alex has done me right each time!

So cool! I've seen those systems around from time to time and always wanted to set one up. Just un practical for what most people on this site do with there skis.

I have a bare drive shaft with me if you need it. Also have new Pump rebuild kits. Call or text would be best Chuck Palmucci CPT Enterprise LLC 609 510 3062

Used air tools for years. Even had old dentist type angle tools. Worked well but got tired of listening to it and my hands getting cold. Switched to cc specialties about 4 years ago. Took a little getting used to. The electric doesn't spin fast but it has tons of torque. Other then a slight...

Lean lean mean. The aluminum went molten on both exhaust sides. Marks in top of piston are from btoken ring pieces after the top edge of the piston melted and the ring broke. Too much egt from a way lean a/f mixture. 31cc domes are way tight for 91 pump fuel so you'll wanna Def revaluate that...

Be there both days!

You guys doing the 10 day a fair as well huh?

If it's set up right it will kick a$$. Flat tops direct the force of combustion directly down into the crank shaft (the whole object of internal combustion engines). Dome tops tend to direct some of the energy from combustion out towards the cylinder walls. I say if it's set up right because...