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how much HP?
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Posted by: 87250rxrider

how much HP do you think i'm getting out of my 250r engine? it has these mods:

-290cc bore
-4mm stroker crank
-'86 long rod
-MX porting by NPRD
-21cc dome
-38mm mikuni TMX slide carb
-K&N filter
-Bills midrange pipe

thanks,
-Ryan

Posted by: baker250r

39.1580127419251094573 1/2 is my estimate

Posted by: 87250rxrider

i'm looking for serious estimates only. a stock 250r has about that much, so i'd say that your wayyyy off!!!! please don't waste my post with non serious answers! SERIOUS ESTIMATES ONLY!!!!

Posted by: DierWolf

Thats what i said as well stock has more hp than the 450R but they maintain it only has 29hp LOL.

Posted by: DierWolf

86 with stock carb, air cleaner, 67.5mm piston and a DG pipe made 32 hp on Dynojet Dynamometer.

Read somewhere cant remember, might be McDizzy he dyno'd his 270 modified 86 trx250 engine with fmf pipe at 49.7hp.

So i would say your around 50-55hp.

Dont know how well Bills pipes works so its just an estimate.

Posted by: 87250rxrider

thats what i was figuring it would be around. i'm getting an LRD adj pipe soon, so that should add a few more horse compared to the bills.