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  1. #1
    Junior Member 250rJokerz's Avatar
    Join Date
    Jul 2012

    1987 Honda TRX 250r Jetting?

    So i recently went out and got a 1987 Honda 250r Four-wheeler with a 310 kit ESR and i ride on the coast. The guy i bought the bike from just had the whole engine rebuilt with the 310 kit added along with the rebuilding. So i took it out on the first ride in the dunes of Oregon where i ride, I noticed when we were riding the Bike was running a bit weird it was not putting out as much power as it should with the new engine and 310 on it. after a while of taking it slow and easy on the new engine i decided to try and take it up a tall hill in a small pace while in the power band and about half way up it just cut the engine completely and shut off we rolled it back down the hill and it would not start after about 40 minutes of waiting and trying to start it, it still didn't start. We had a friend of ours who was out with us run back and get a strap after he got it we pull started it. Once it was running it wouldn't hit the power band and if it did there was not very much power at all, after thinking and talking about it we came to figure it was the Jetting being to fat so we got it back to the shop and the next day we stripped it and checked what the jetting was at. We came to find out it was running a TMX Mikuni bore Carb while running 420 on the main jetting. we took it and replaced the jet with a 400 and now it has a little more power and we think it either is running leen or is running to fat.For anyone who is wondering i am asking what size jet i should be running on the bike it has ESR pipes on it along with a k&n air filter. So what size jet would you recommend for my to run at the coast on it? Thank you in Advance.

    P.S. Here are some pictures of the bike

  2. #2
    Senior Member Bowtie316's Avatar
    Join Date
    May 2012
    South of KC
    There's really no way to tell by what you posted what is going on. You will need to do a search for plug chops, to find out how to do that, then post some pictures of your chopped plug. This is really going to be the quickest way to get your jetting close.

  3. #3
    Supporting Vendor acecarlos's Avatar
    Join Date
    May 2010
    Alta Loma, California
    As a starting point only, for 310CC try 360-400 Main, 25 to 32.5 Pilot, Needle on 3rd Clip down, AS at 2 turns out. As suggested, Plug Chops and listening to your engine are the proper way to jet.

    BDT MOTORSPORTS 909-466-9152 M-F 9:00 AM to 6 PM, Saturday 10 AM to 4:30 PM. Visit our Web Site at WWW.BDTMOTORSPORTS.COM or email: BDTMOTORSPORTS@YAHOO.COM 'SIMPLY THE BEST' BDT MOTORSPORTS'


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