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Great info, Thanks! We did a complete belt alignment and adjustment on the sled and it definatly helped. It appears the belt was a bit to tight and would get hot sitting and idling and drag the motor down. Last time out she ran like a top. But I will get a set of the brass needle / seats and...

Yeah, ours is a 1996 and the vacuum pod had simply lost its air behind the diaphram. We had a spare pod and it needed calibrated too. Suprisingly, they both have held calibration now and it has bee a month or longer. I tried this because it was easy and I didnt have to gather up parts to do...

This is what we did and it is still running great. https://www.snowandmud.com/forum/f463/670-summit-high-altitude-compensator-hac-41125.html Hope it helps. Jeff

I would toss a set of new plugs in. I am betting one is laying down. Jeff

Well she survived a mountain run over the weekend. We were as high as 7500 feet and the HAC did fine. It was still pulling good rpm and no fouled plugs. Sled runs really strong. We are still fighting an irratic idle issue with it. Some times it wants to pull down and idles really slow (under...

We have a 96 Summit 670 and we have gutted the air box ( removed the shelf) We do not have a problem with water. Our carbs fit into the air box very tightly with rubber gromets. In fact we lightly grease the rubber to aid in them sliding over the carbs easier. Is your air box missing the...

This Sled has the HAC.. High Altitude Compensation and I just calibrated the pod. As I shared in this thread. This was before milling the head to up the squeeze. https://www.snowandmud.com/forum/f463/670-summit-high-altitude-compensator-hac-41125.html Jeff

Thanks Drewski, The plug chop test worked well. It is nice to be able to see and read the results of a test. So many methods of plug reading leave you wondering and not positively sure. It is hard to tell from your photo of your plugs, but they looked almost identical to mine as fa as color...

Update! We pulled the cabs off of the 96 Summit 670 and found that the float level was a bit low. So we raised it to specs. .772". Then we installed the larger mains of PTO 390 Mag. 380 It was colder today so we felt we were going to get a better test as far as normal conditions and temp...

Then I am with "Forever RMK" ice or something holding a slide open at least part way. If it is water (ice) I would be for pulling the carbs and drying or blowing them completely out too in a warm envirement. If that water gets to the bottom of the bowl and freezes it could restrict a jet...

I took a look and need a smaller diameter flex light. I will pick one up. But I want to do the chop too. Seems to me the wash would be a slower reacting observation where the plug chop is a direct indication of what was just going on a WFO... oops I mean WOT. Thanks to all. :beer: Jeff

How high is it reving? If for some reason it has gone lean it will rev up. Or are you sure the throttle is indeed open? Jeff

I have thought of pulling the head too. I just milled .020" of it and was right at .050" on the clearences. Might be nice to make sure all is clearing ok. I dont think I could see enough of the piston domes any othe way. Jeff

Thanks Guys, I will do the test and chop a set of plugs then post a pic and results. Thanks to all. Jeff

Thanks Drewski, got it. That sounds good to me. We use to put new ones in every pass on the race car to read abd ballance each cylinder. I had not seen the info you posted before. Looking forward to seeing how new plugs look after a blast. I will use the existing plugs to warm up and change...

We just went through this with a 1996 670 Summit. Start cold shut it off and would not start. Sometimes just died like hitting the kill. We had bought this sled recently and I power washed the entire sled on the way home (engine too) After 2 weeks what we found was if we moved the wires...

Thanks! I am learning. I have a ton of experience reading plugs from Blow Alcohol and Blown Nitro in Drag racing. But my experience on two strokes in limited. I am learning.. I wiped the oil off the rim of the barrel with a towel to look at the burn there. I wanted to see if the cadium...

I would like to have some opinions from the experts on plug reading here. These are out of our 1996 670 Summit with Jaws pipes. The plugs were almost new and I cleaned them with Carb cleaner and a wire brush before the test. This is what they looked like after 3 runs. Each run was longer...

Update!! I took a spare head we had and milled it down .020" this put me about .053" average piston to head when measured at both sides above the pin. Compression came up frm 105 to 125 when pulled till the gauge stopped moving with carbs open. We took the main jets up 10 on each side, this...

I will look for the photos of the 501 RV and get to cuttin. I had fears that the 44's may not be the best choice. They would probably give up some throttle responce and low end to get that 2 hp at the very top. Probably not the best when you get in the deep stuff either. So we will do the...