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Post by nelson on Jun 2, 2014 8:47:32 GMT -5
What I did notice is it doesn't have a "power band" as it just pulls hard from the take off, i cant really tell if it is on the pipe or not. Could be due to jetting and cvt tuning
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Post by nelson on Jun 4, 2014 13:36:04 GMT -5
I had in the chance to run it again last night. I am still running 5 gram rollers and stock clutch springs. What I did notice is it is making good power. I gassed it up hill and hit 42mph quick then had to let off.it wants to pull the wheel up from the torque but I think it just isn't Getting in powerband quick enough during take off. At 42 mph it still felt like I had plenty of gear left to achieve a high top speed. Anyone want to trade a 2000 rpm contra for 2 clutch springs? What is the advantage of heavier rollers? So it wont switch to the front pulley so quickly during take off? It feels like it makes good power from take off all the way up. Just think there is something I am missing. Jetting I beleive is good with a 95 main
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Post by 90GTVert on Jun 4, 2014 16:33:28 GMT -5
Heavier rollers will make it shift even faster. As long as there is sufficient tension to keep the belt taut, I don't like going to stiff contra springs and heavy rollers. For me it seems like most of the time the stiffer contra with heavier rollers does the same thing as a softer contra with lighter rollers.
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Post by nelson on Jun 4, 2014 17:22:47 GMT -5
I am using a 1 K contra and stock clutch shoe springs at the moment I think I need to upgrade thosethe clutch shoe spring I am running now are the ones that came with the Polaris engine so I'm sure they are very worn out
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Post by nelson on Jun 7, 2014 15:31:06 GMT -5
Ok, I took some weight of the clutch shoes and it power Willy but just a bit on take off. Still waiting on some clutch springs instead of the stock. Let me tell u what I am running and get some opinions. 1k contra 6g rollers and my gear ratio is 8:1. I think that may be the may be the issue. I had a 95 main and hit 50mph went to a 100 main and went 52 mph. the engine seems to run a lot hotter than my 70bbk. I have the technigas pipe for 100cc and a 24mm carb. It just seems kind of flat like it isn't on the pipe ever. It just pulls the same at all rpm like. 4 stroke. It pulls decent but I think my 70 might be faster. I am using a stock polaris cylinder. I have a 50mm cylinder that I think I need to set up for my pipe. Any ideas?
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Post by nelson on Jun 7, 2014 16:47:38 GMT -5
Oh and a 43.5 24mm crank. Just seems as it should be way faster then a 70. Maybe its the cylinder or comp ratio. But it would seem the cr would be high using a crank with 1.5 more mm stroke and no head gasket. I need to stick in a compression tester, I think rings could be poop
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Post by 90GTVert on Jun 7, 2014 18:31:54 GMT -5
Wheelies with 8.8:1 gears and a stock cylinder sounds like it's doing pretty well to me. No experience with the TG pipe, but I know some of the milder tuned pipes like the ZX you don't necessarily feel a hit. I don't anyway. It has RPM where it's strong and where it's weak, but it's not like a switch where it's mild and then BANG!
It sped up with a 100, so did you try a 102-105 and see what happened?
Are you running the big fan on the 90? If not it'll run hotter than the 70 even in tune.
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Post by nelson on Jun 7, 2014 23:13:37 GMT -5
Yes, I bought a hoca turbo fan. It has large blades and looks like it will move more air than stock. Have you seen one? Hopefully it keeps up, I think its good. I dont have anything larger than a 100. I think I may need to come down actually. There was a lot of unused fuel on the plug dont get it? I did a kick over compression test and was at 100 psi. That could be an issue. I have a new piston and cylinder I am going to try.but its only a 50mm I might do a but of work to the cylinder before putting it on
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Post by 90GTVert on Jun 8, 2014 6:36:27 GMT -5
I haven't seen one in person. I think the actual 90cc fan would do more, but I may be wrong. Not sure what room the Jog has, but it doesn't fit under all shrouds because it's much taller. I dropped 60 degrees at 40MPH cruise when I switched from standard to the 90 fan on Project 90. Not sure how much it lost at WOT because the gauge was maxing out with the stock fan. 30 degrees cooler at idle. www.ebay.com/itm/2004-Polaris-Predator-90-Engine-Cooling-Fan-with-Bolts-/111295189774I wonder if the compression tester is correct. I would not expect that performance at 100psi with those gears. |
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Post by nelson on Jun 8, 2014 12:18:07 GMT -5
 It has less blades but the blades are pretty big. What do u think? It dwarfs the 50cc fan |
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Post by nelson on Jun 8, 2014 12:19:23 GMT -5
I think that stock 90 one is better imo. More blade surface area. I need one..thinking about it its hard to tell. I guess I would have to measure the surface area of each blade and multiply to be exact. I have a 90 cc Shroud so it fits under there.
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Post by 90GTVert on Jun 8, 2014 13:03:59 GMT -5
Ya, wasn't even thinking that it's a 90cc swap so you have the shrouds. I thought about trying one of those, but just based on looks I also figured the 90 is better. Lots of large blades.  |
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Post by nelson on Jun 8, 2014 14:12:24 GMT -5
Ok, put on the 50mm cylinder and it has 150psi. The cylinder is about 1mm shorter than the polaris stock cylinder. I ran it with a 100 main and it was bogging wouldn't rev. Dropped to a 90 ran better but would only rev to 7500 rpm. After a run around the neighborhood I think I soft seized it. Was like I just turned it off. Maybe a 95 main is the ticket..cant work on it anymore today.  I have the needle set at the leanest position. I think this cylinder is going to run good just needs tuned. The transfer ports look like shit, one of them isn't even the correct size, bad cast. $50 top end kit....I think my best bet would be to just buy a new 54mm kit with aux ports. I think I need the short cylinder vs the tall. |
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Post by nelson on Jun 8, 2014 14:13:50 GMT -5
Or go back with the 52mm and shave a mm off the head
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Post by nelson on Jun 8, 2014 14:37:25 GMT -5
What is the stroke of a stock polaris crank?
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I have the needle set at the leanest position. I think this cylinder is going to run good just needs tuned. The transfer ports look like shit, one of them isn't even the correct size, bad cast. $50 top end kit....I think my best bet would be to just buy a new 54mm kit with aux ports. I think I need the short cylinder vs the tall.