Vibration..much ado about..Balancing
Anyone build a CFI 800 with the new IQR crank?
- Thread starter IQRIDR
- Start date
dynamic balancing is a tricky thing....
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Get your GOLDEN TICKET.....
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So going back to the threads meaning, how do you put a 600 crank in an 800 with a different stroke?
The IQR 600 since ('08) is a long stroke (70mm) crank. It Uses the same crank as the 800 CFI. Starting this year ('14) they lightened the race crank by 2.5#'s by switching to pork chop wheels as opposed to the traditional round wheels.
I thought the new Rush 800 uses the lighter crank this year from the IQR600.
The '15 does, but you can not get it until next winter. The race crank is available now.
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Anyone have any details on this new crank, where its made, durability, bearings used?
As for durability, one of the sno cross teams has used it exclusively for the last 3 seasons with zero issues. That is all I can speak to ATM.
600 race crank in an 800
I built this engine with lightweight crank at the end of last season (end of March 2014). My platform was a 2013 Pro RMK 155" with a 3" track. was running stock clutching the whole season till the build. I used a 13 case, lightweight crank, brand new 13 cylinder with a 'fixit' kit with new pistons. I did the break in rides and moved to a blue/pink and 66 gram weights because I was over reving. Still on the flats I have been consistently hitting 8550rpm rev limiter and climbing hitting 8200 consistently. I do have the 7 tooth avid drivers with the stock belt drive gearing, not sure how much that is affecting things. I have over 400 miles on it this year, for a total of about 550 miles on it and have had zero issues with the engine. I ride full throttle most of the time and put her away wet.
I built this engine with lightweight crank at the end of last season (end of March 2014). My platform was a 2013 Pro RMK 155" with a 3" track. was running stock clutching the whole season till the build. I used a 13 case, lightweight crank, brand new 13 cylinder with a 'fixit' kit with new pistons. I did the break in rides and moved to a blue/pink and 66 gram weights because I was over reving. Still on the flats I have been consistently hitting 8550rpm rev limiter and climbing hitting 8200 consistently. I do have the 7 tooth avid drivers with the stock belt drive gearing, not sure how much that is affecting things. I have over 400 miles on it this year, for a total of about 550 miles on it and have had zero issues with the engine. I ride full throttle most of the time and put her away wet.
You have to use a fuel controller on this mod? Or you running the stock mapping?
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