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Old 06-29-2008, 06:26 PM   #1
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Default jpx .21-.28

wat is yalls thoughts and experiences with these engines im looking at getting one of the two for my CRT
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Old 06-29-2008, 06:38 PM   #2
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im running the jpx 21 in my buggy and i absolutely love it ive been running a os p3 plug on it but im hoping to try the os p6 or a colder plug next weekend
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Old 06-29-2008, 10:24 PM   #3
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Love mine. I put an after market head on and it woke up the performance and MPG considerably. Has enough pinch to last 100 gallons
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Old 06-29-2008, 11:27 PM   #4
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I run both motors in my Hyper ST pro. Love them both. Great power band. Very strong on the bottom and awesome top end. Use it with the Ofna 053 pipe and it's ballistic.
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Old 06-30-2008, 08:45 AM   #5
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ive been reading different reviews for these two engines and some people are complaining that because it has so much pinch you either have to use a hair drier or heat gun just to turn the motor over.

If thats true how many gallons before u dant have to do that anymore
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Old 06-30-2008, 12:00 PM   #6
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i never used a heat gun just follow the directions and it will break in after a gallon.

and rally what head are you running on your i wish i could get a bit more runtime out of mine
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Old 06-30-2008, 02:59 PM   #7
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Just use the heat gun for the break in process. I'm running a Nova head I modified myself on my metal lathe because they are too heavy. I got mine to 84 grams(same as the stock Jammin) and 1-2mm lower in height. I had to lean it quite a bit to get it to run 205 degrees.
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Old 06-30-2008, 03:10 PM   #8
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Quote:
Originally Posted by rallyebmx View Post
Just use the heat gun for the break in process. I'm running a Nova head I modified myself on my metal lathe because they are too heavy. I got mine to 84 grams(same as the stock Jammin) and 1-2mm lower in height. I had to lean it quite a bit to get it to run 205 degrees.

WOW ! props man ... that is very cool what you did with that Nova head ..
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