Collins27

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About Collins27

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  1. I have a 2011 Crf250r and I had this problem last summer when the bike sat for 6 months it had a hard time starting , I would give it blips of throttle and it would back fire every once and a while but wouldn’t start. Then I eventually got it to start, then it would start up within first 5 Kicks every time. And I could not touch it for weeks or month and it would be fine. Now recently I just replaced piston and it ran fine before but after the new top end I tried to start for the first time and I wouldn’t go. The valve clearances are perfect and timing is perfect as was before the new piston. I’m thinking it’s lack of fuel or bad fuel sitting in the throttle body which isn’t letting it start. Just wondering if me taking the gas tank off and all the fuel lines that it could not have enough fuel to start. Only tried tonight so going to keep trying to start it but looking for any suggestions. Thanks
  2. Hi guys, I have a 2011 Crf250r that I’m going to pull the top end since I don’t believe the previous owner did any matinence on anything on the bike so I want to freshen up the Motor since I’ve replaced almost everything else on the bike. Now since I’m replacing piston I was wanting to try the JE 14:2:1 HC piston along with a cam , hot cam or anyone that suits it best. I’m aiming for low end to mid power increase. I figured if I add these mods to it I’ll be getting my ecu remapped and dialed into run vpU4.4. Just curious by adding these mods will I be adding a lot more stress on the engine? I understand by doing these mods I’ll have to be checking the piston and valve clearances more often which is no problem at all but just trying to figure out if it’s going to be adding more stress by doing this or just more matinence. thanks!
  3. Ya I saw that , they did the cam, piston and exhaust and dynoed them all separately and surprisingly the pipe made the most hp. I want lots of low end too and I know the cam I was looking at allows more throttle with low rpm and more low to mid hp gain with a bit in the top too. My bike runs great now so I don't think the valves or anything are in bad shape but I won't really no until I take a look. I just don't think the guy before me replaced anything so I have been worried about that. Even tho it runs great. Just want to figure out what I'm going to buy before I rip it apart and want to go high compression piston anyways so even if piston is good I want to get more out of it
  4. That is an option forsure, just trying to figure out my best option. I saw on tokyomods they sell a 3.2mm+ big bore cylinder kit with a 13:2:1 compression piston. Do you think that would make more power then just the 14:5:1 piston ? And same question if I went big bore piston and after market cam would my crank and valves be ok being stock?
  5. I have a 2011 Crf250r that I want to put a high compression piston , new cam, and vortex ecu. I was looking at the Carrillo 14:5:1 piston kit, and the hotcams cam shaft. I am going to get the vortex ecu and have the bike programmed and running on vp U4.4. If all my valves and crankshaft are in good shape is there any need to upgrade other parts to run the upgrades I'm wanting to install? They also had 14:0:1 and 13:5:1 pistons I was looking at but I am planning on running the U4 fuel anyways so would the 14:5:1 piston be ok? And do you know how much more power you would be achieving by going to a 14:5:1 piston compared to the 13:5:1? Or do you think it would be to high compression for not change stock crank etc. thanks!
  6. I have a 2011 Crf250r that I want to put a high compression piston , new cam, and vortex ecu. I was looking at the Carrillo 14:5:1 piston kit, and the hotcams cam shaft. I am going to get the vortex ecu and have the bike programmed and running on vp U4.4. If all my valves and crankshaft are in good shape is there any need to upgrade other parts to run the upgrades I'm wanting to install? They also had 14:0:1 and 13:5:1 pistons I was looking at but I am planning on running the U4 fuel anyways so would the 14:5:1 piston be ok? And do you know how much more power you would be achieving by going to a 14:5:1 piston compared to the 13:5:1? Or do you think it would be to high compression for not change stock crank etc. thanks!
  7. And also who would you recommend to remap the ecu?
  8. Wanting to get more out of my 250f. Does just remapping it and running u4.4 fuel or other race fuel make much difference? Or do you recommend doing that as well as a hot cam stage 1? Also if I did do both those mods would adding a new aftermarket exhaust be needed or would it just help to goal of adding power? thanks!
  9. I ride mx and the tracks are usually pretty hard pack, rutty, lots of braking bumps. And I am buying a 2016 CRF250R and only weigh 135lbs. I'm wanting to get my forks revalved. Do you think it's worth converting back to spring rather than air? I got a quote from FC for revalve and they quoted switching back to spring. Not sure if they only do spring or if that's just the best way to go? I ride intermediate and have a 2011crf250r right now and have never revalved before. But have heard it helps a lot, especially in the track conditions I ride in. Just trying to get a better idea if it's worth just switching them over to springs right away or other options? Thanks
  10. Ok I gotcha. I'll get those for you tomorrow
  11. But the distance will be larger on the 2014 due to the fact you need a sprocket spacer on the 02-13 wheels
  12. ill do that tomorrow for you fredgreen
  13. Would this sprocket work on a 2016 CRF250R to run 2011 CRF250R wheels? Or is the offset different from 2014 to 2016
  14. Thanks Demi I saw some on eBay for cheap, that's great. Glad I can keep the wheels for the new bike! Thanks for the help
  15. Ok didn't no that. Well that's good news, I'll look into that! Thanks for that , would I most likely need one for the front too ?