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Thread: 85 Honda ATC 250r Jetting Help!!!

  1. #1
    Join Date
    Feb 2018
    Location
    California
    --
    10

    Exclamation 85 Honda ATC 250r Jetting Help!!!

    Hey guys, so recently had my cylinder bored to 66mm, I just got a PJ 38mm carb, threw everything together the jets are a 162main and 52slow needle is 2nd clip, it idles fine right now but loaded up when giving gas to the point it fouls the plug, I have Boysen power reads right now that are going bad, I have a rad valve on the way, just looking for pointers on jetting as I fought this problem with my 34mm stock carb as well. Pipe is fmf fatty, silencer is a fmf power core 2, direct air because of new carb, took spark plug out and it is black so assuming running to rich. I live in California weather is about 80-99 degrees, any advice is good advice thanks for looking!
    Last edited by Eraginal; 11-04-2018 at 12:27 AM. Reason: More details

  2. #2
    Join Date
    Mar 2010
    Location
    Slidell, LA
    --
    4,356
    Quote Originally Posted by Eraginal View Post
    Hey guys, so recently had my cylinder bored to 66mm, I just got a PJ 38mm carb, threw everything together the jets are a 162main and 52slow needle is 2nd clip, it idles fine right now but loaded up when giving gas to the point it fouls the plug, I have Boysen power reads right now that are going bad, I have a rad valve on the way, just looking for pointers on jetting as I fought this problem with my 34mm stock carb as well. Pipe is fmf fatty, silencer is a fmf power core 2, direct air because of new carb, took spark plug out and it is black so assuming running to rich. I live in California weather is about 80-99 degrees, any advice is good advice thanks for looking!
    Move pilot to 48 and clip 3rd from top. Leave main the same and run your air box with an oiled uni filter.
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  3. #3
    Join Date
    Feb 2018
    Location
    California
    --
    10
    Thanks will give that a try I can’t use the stock air box or boot right now because of the bigger carb so I was thinking about getting a filter I can connect straight to the carburetor. Also know of a good place to get jets eBay jets come from China and I don’t want to wait a couple months to get them? Thanks

  4. #4
    Join Date
    Oct 2003
    Location
    Las Vegas, NV.
    --
    2,042
    Quote Originally Posted by Eraginal View Post
    ...I can’t use the stock air box or boot right now because of the bigger carb...
    Sure you can. You just have to stretch out the stock boot to accept the bigger carburetor. Try soaking the boot in hot (practically boiling) water, or setting it out in the sun on a hot day to make it pliable, then lube up, and slip in a beer bottle to stretch out the boot. Let it cool down, with the beer bottle in place, and then remove the bottle, and massage it over the new carburetor. Not all beer bottles are the same size, so find the right size (hopefully your favorite brand works), and go to town.
    Red Rider's Sand Machine Updated 07/23/14

  5. #5
    Join Date
    Feb 2018
    Location
    California
    --
    10

    Talking

    Quote Originally Posted by Red Rider View Post
    Sure you can. You just have to stretch out the stock boot to accept the bigger carburetor. Try soaking the boot in hot (practically boiling) water, or setting it out in the sun on a hot day to make it pliable, then lube up, and slip in a beer bottle to stretch out the boot. Let it cool down, with the beer bottle in place, and then remove the bottle, and massage it over the new carburetor. Not all beer bottles are the same size, so find the right size (hopefully your favorite brand works), and go to town.
    Lol I like this I better use an 805 rather then the usual corona hahah

  6. #6
    Join Date
    Aug 2015
    Location
    H B
    --
    104
    Your current elevation matters ALOT


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