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Old 08-05-2010 | 05:01 PM
  #11341  
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Originally Posted by deadmancourt
thank you!....i put it all back together and sat it out in the sun for 30mins cause i dont own a heat gun and it runs great!....i didnt really even drive it but just fired it made sure it idles and blipped it acouple times and all is good....sounds great!....about the shims,right before i put it back together i tried what you said and found 1 thick shim,the same color as the button head,but no other shims!...should there be any more shims! i only run 20%...i have a few old shims some thin,some thick,but none as thick as the 1 thats on this motor!
put 1 thick & 1 thin copper shime on to re-leave the preasure on your rod !
this should help :
http://www.massivemods.com.au/produc...roducts_id=192
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Old 08-05-2010 | 05:08 PM
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so both 1thick and 1thin copper?...so there will be a total of 3 shims including the real thick aluminum colored 1?....how thick are each of these shims?...would i be going to .7mm or .4?
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Old 08-05-2010 | 05:22 PM
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.7 as .3 is built into the head button, when it's run in remove the .2 shime & u should be in the ballpark depending on the quality of the fuel u use. JMO others might differ but read the text on shiming from the link & keep an eye on your pipe temps
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Old 08-05-2010 | 05:25 PM
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runs great!

Last edited by deadmancourt; 08-23-2010 at 10:09 PM.
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Old 08-05-2010 | 05:31 PM
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yep, don't matter what order
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Old 08-05-2010 | 05:51 PM
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Originally Posted by MAGPIE-121
.7 as .3 is built into the head button, when it's run in remove the .2 shime & u should be in the ballpark depending on the quality of the fuel u use. JMO others might differ but read the text on shiming from the link & keep an eye on your pipe temps
hi, i saw you said keep a eye on pipe temps??? what should pipe temp be? what causes pipe to get hot or derasticly change temp?
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Old 08-05-2010 | 05:53 PM
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thanks for your help! everything is gravy!
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Old 08-05-2010 | 05:55 PM
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Now i got another problem. The screw that tightens the carb neck broke inside the carb neck :/ This engine is just a hassle, maybe i'll just chuck it and keep it for parts.
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Old 08-05-2010 | 06:02 PM
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Originally Posted by jwm2
Now i got another problem. The screw that tightens the carb neck broke inside the carb neck :/ This engine is just a hassle, maybe i'll just chuck it and keep it for parts.
lol, i know its not funny, but you have luck like i do, you will probly need to drill a small hole and use easy out
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Old 08-05-2010 | 06:07 PM
  #11350  
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Originally Posted by inferno13
hi, i saw you said keep a eye on pipe temps??? what should pipe temp be? what causes pipe to get hot or derasticly change temp?
the pipe should be cooler than the head !

quote from MM
" The more shims you run the lower the comp ratio, less tank time, and the cooler your head will run but this will give you hotter exhaust temps so if you are melting bodies thats why !"

IMO the fuel is being burnt outside the exhaust port i think because of the lack of compression !
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Old 08-05-2010 | 06:09 PM
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what size carb venturi do you guys run in truggy?...
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Old 08-05-2010 | 06:15 PM
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Originally Posted by deadmancourt
what size carb venturi do you guys run in truggy?...
i use a 7mm or 7.5mm, depending on track size and lenth of main, i have also used a 6.5
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Old 08-05-2010 | 06:21 PM
  #11353  
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Originally Posted by jwm2
Now i got another problem. The screw that tightens the carb neck broke inside the carb neck :/ This engine is just a hassle, maybe i'll just chuck it and keep it for parts.
try this : heat up the carby neck around the bolt head & u should be able to pull the bolt head out.
then with a very small screwdriver put it through the hole & tap out the other side of the pinch bolt & repeat for the other side
the pinch bolt is cheap so don't give up just yet !
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Old 08-05-2010 | 06:57 PM
  #11354  
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Originally Posted by MAGPIE-121
try this : heat up the carby neck around the bolt head & u should be able to pull the bolt head out.
then with a very small screwdriver put it through the hole & tap out the other side of the pinch bolt & repeat for the other side
the pinch bolt is cheap so don't give up just yet !
Well half of the screw came out when it broke, which is the part with the head. I'll try heating it up and see what happens. It'll give me something to work on this evening
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Old 08-05-2010 | 07:49 PM
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what pipe do you guys recomend for the gx-5r?....i have a jp-4,is this a good pipe for these motors?
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