I've got a 75 mercury , believe that's what it has in it , kinda thought about tinkering with it, but it's in loose hands

What are their prices on pistons ? I could be very competeive on price and bore size

I haven't but would do it without hesitation , the 295 has a 56 mm bore and the 340 is 60 that's 4mm difference I realize but should be a non issue. Wade

Never got around to trying it I have pistons and rings if you are interested , think I have a few sets of the correct bearings too

Matt can get you gaskets for a 340/5 like in a Jdxspec 4 special , they aren't exact and the head gasket bore diameter will be a little big on the gasket ,otherwise would be correct. Custom gaskets from cosmetic are terrific but costly

Actually your question is " the question". Everyone has a different thought on what temp is ideal or too hot. Years ago we ran chat gauges on 5 hp Briggs and much over 350 degrees I think and trouble was near you are getting along ok at 550? With egts I've paid more attention to them then ...

I have 2 sleds with Koso egt . It's not as easy to tune with them as it seems it should be , they are great for avoiding disasters

I have a jdx 4 similarly equipped , I've been messing with chain case gearing , for trail riding and bombing around, what do you recommend ? i started out with 16-35 in it and it seemed to be gear bound , I have 18-35 and awaiting snow and usps to arrive with a 19t top sprocket. Also been messing wi...

The timing ring holes aren't threaded, I think they are slotted which provides for adjustment of ignition timing I wouldn't use heat on aluminum I've never had good results with that , I'd bet you could find someone to trade you /22 blocks for /21 blocks as the 21s has fairly low production numbers ...

center ball bearings on the cyclone are smaller than the l/f wade

Very cool of Polaris to donate it to the hall of fame , no one can enjoy it stuck in a semi trailer. It is a piece of Jd snowmobile history .

Grumpy. I think I have some extras , I had some made up for fuel jugs a few years back and never got around to using them , I'll see what I have

pat is right , last time I bought from dk the pistons they shipped were nos in the original kioritz boxes. best option if available for sure wade

I like it !!

is that a short one with the tool box ? different that a 78 lf? I think I have one wade