intro and first mods..will i need carb jetting?
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Joined: May 2016
Posts: 57
From: Philadelphia, PA
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intro and first mods..will i need carb jetting?
Greetings! Just purchased a '07 klx250s with 3550 miles in Pennsylvania. The only mods I can tell were done was a 13T CS and a skid plate.
As you all know, the bottom end is very anemic under 6K RPM. I've been reading pages of threads about mods. However, I don't have a proper moto education, thus am not fluent in a lot of the language and my head is spinning. So please don't be short with me for asking a question that may been answered in a bunch of other threads.
My question is if I change my snorkel, upgrade my airfilter to 2 part foam or K&N, and purchase an aftermarket slip-on exhaust (with the stock header) what should I expect in terms of performance changes and will I need to change the stock jetting?
Thank you.
The throttle response is also mush, so I guess a pumper carb (newly learned, thanks guys) is in my future. Anyone know the best place to purchase one that is as close to plug-n-play as you can get?
yours truly,
007
As you all know, the bottom end is very anemic under 6K RPM. I've been reading pages of threads about mods. However, I don't have a proper moto education, thus am not fluent in a lot of the language and my head is spinning. So please don't be short with me for asking a question that may been answered in a bunch of other threads.
My question is if I change my snorkel, upgrade my airfilter to 2 part foam or K&N, and purchase an aftermarket slip-on exhaust (with the stock header) what should I expect in terms of performance changes and will I need to change the stock jetting?
Thank you.
The throttle response is also mush, so I guess a pumper carb (newly learned, thanks guys) is in my future. Anyone know the best place to purchase one that is as close to plug-n-play as you can get?
yours truly,
007
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Joined: Jun 2013
Posts: 3,314
From: North Texas
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Welcome to the forum..
Yes, you have to change the carb setup when you mod the exhaust side and intake side..
Get the slip-on, DJ2152 or DJ2206 kit, call DJ and get a DJ140 main jet. Pull the airbox lid off and install that stuff and you'll have a whole new bike, from the 16 or so HP (at the rear wheel) you have now, to about 22.
"as close to plug and play as you can get" - that's call to Bill Blue at B&B Cycle Restorations for his TM34 modded for the KLX..
Yes, you have to change the carb setup when you mod the exhaust side and intake side..
Get the slip-on, DJ2152 or DJ2206 kit, call DJ and get a DJ140 main jet. Pull the airbox lid off and install that stuff and you'll have a whole new bike, from the 16 or so HP (at the rear wheel) you have now, to about 22.
"as close to plug and play as you can get" - that's call to Bill Blue at B&B Cycle Restorations for his TM34 modded for the KLX..
Last edited by Klxster; May 2, 2016 at 02:26 AM.
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Joined: May 2015
Posts: 329
From: Kenora, NWO, Canada
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From my reading of your post it sounds like you want do the mods slow at first. The first thing I would do is uncorked the exhaust. If a slip on muffler is not something you want to do right now you can modify you existing muffler and let the bike breath. Doing the intake side before the exhaust won't give you that much if a performance gain. The outlet on the OE exhaust is so small and opening it up will give good results. Then proceed to the jetting and intake mods. Do a search for the exhaust mod.
If you do plan on spending money straight off save some cash and jump right to a big bore kit with the TM36-68 carb. The bike becomes a completly different animal. I spent money doing all the mods and ended up with extra parts that are sitting in my shed after I went with the 351 BB kit.
If you do plan on spending money straight off save some cash and jump right to a big bore kit with the TM36-68 carb. The bike becomes a completly different animal. I spent money doing all the mods and ended up with extra parts that are sitting in my shed after I went with the 351 BB kit.
Last edited by Ruggybuggy; May 2, 2016 at 11:28 AM.
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Joined: Jun 2013
Posts: 3,314
From: North Texas
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Ooh-rah ! C'mon in, bring a cow bell, we need more cow bell.. We're having crayons for lunch..
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Member
Joined: May 2016
Posts: 57
From: Philadelphia, PA
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mmmm tasty crayons. pink is my favorite..
anyone know if the FMF Q4 fits the '07? FMF says it won't on their site, only '09 and up???
Am i on the right track for more low end torque, or should i be obsessing about other mods right now without going as far as BB or cam work?
anyone know if the FMF Q4 fits the '07? FMF says it won't on their site, only '09 and up???
Am i on the right track for more low end torque, or should i be obsessing about other mods right now without going as far as BB or cam work?
Senior Member
Joined: Oct 2010
Posts: 4,507
From: SW Idaho
1st Gear Member
mmmm tasty crayons. pink is my favorite..
anyone know if the FMF Q4 fits the '07? FMF says it won't on their site, only '09 and up???
Am i on the right track for more low end torque, or should i be obsessing about other mods right now without going as far as BB or cam work?
anyone know if the FMF Q4 fits the '07? FMF says it won't on their site, only '09 and up???
Am i on the right track for more low end torque, or should i be obsessing about other mods right now without going as far as BB or cam work?
I picked it up used from ebay. Seller said it was for '09+.
Senior Member
Joined: Aug 2009
Posts: 4,648
From: Delaware, Ohio
1st Gear Member
Greetings! Just purchased a '07 klx250s with 3550 miles in Pennsylvania. The only mods I can tell were done was a 13T CS and a skid plate.
As you all know, the bottom end is very anemic under 6K RPM. I've been reading pages of threads about mods. However, I don't have a proper moto education, thus am not fluent in a lot of the language and my head is spinning. So please don't be short with me for asking a question that may been answered in a bunch of other threads.
My question is if I change my snorkel, upgrade my airfilter to 2 part foam or K&N, and purchase an aftermarket slip-on exhaust (with the stock header) what should I expect in terms of performance changes and will I need to change the stock jetting?
Thank you.
The throttle response is also mush, so I guess a pumper carb (newly learned, thanks guys) is in my future. Anyone know the best place to purchase one that is as close to plug-n-play as you can get?
yours truly,
007
As you all know, the bottom end is very anemic under 6K RPM. I've been reading pages of threads about mods. However, I don't have a proper moto education, thus am not fluent in a lot of the language and my head is spinning. So please don't be short with me for asking a question that may been answered in a bunch of other threads.
My question is if I change my snorkel, upgrade my airfilter to 2 part foam or K&N, and purchase an aftermarket slip-on exhaust (with the stock header) what should I expect in terms of performance changes and will I need to change the stock jetting?
Thank you.
The throttle response is also mush, so I guess a pumper carb (newly learned, thanks guys) is in my future. Anyone know the best place to purchase one that is as close to plug-n-play as you can get?
yours truly,
007
My brother and I went with the KLX300 parts and added the Dial-A-Jet fuel adder, kind of like the Mikuni PowerJet, adding fuel mix when the engine is drawing lean. It compensates for lean fuel mix. I had used one on my KLX650 with excellent results. It didn't need any actual brass jet changes even after putting in a big bore piston and a full reverse cone megaphone exhaust. Not so lucky on the 250, but we've only had to do the jetting one time, no main changes.
Either way you will appreciate how the easy starting and quick warm up, because both worked well.
Thread Starter
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Member
Joined: May 2016
Posts: 57
From: Philadelphia, PA
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Can you speak to the reason behind using a DJ140 main jet vs a 128?
Found this on you tube and these guys use a 128 with good results:
https://www.youtube.com/watch?v=zFx1...hGGdCR#t=491.7
Sorry to be a pest today, but I'm at work all night in front of a computer
