Jump to content
Sign in to follow this  

CRF230 Power-Up Jetting at 6000 ft?

Recommended Posts

Anyone have an idea what jet sizes I should use if I uncork my 230 and ride around 6000 ft above sea level?

Thanks in advance!

Share this post


Link to post
Share on other sites

I live at 4,000 ft and ride between 3,500 and 5,000. My 230 runs the 115 main jet, the stock needle with the clip in the middle position, the stock 42 pilot jet, and 2.0 turns out on the mixture screw. I just did it yesterday and it starts immediately and idles fine. I ran it up and down the street a few times and it felt good, but I haven't had it out on the trails yet. Before that I had the 120 main, the power-up needle with the clip in the 4th groove (from the top), the stock pilot, and 2.5 turns on the mixture. Both these set-ups were with the exhaust insert and snorkel removed.

With the 120 main and power-up needle it felt a lot better than stock, but didn't seem to pull as well as I thought it should....it just felt like it could be better. I'll let you know how it does in the "real world" after I get out to ride again next weekend, but feel that it will be an improvement.

Hopefully coeshow will jump in here with the good info.

Cheers,

Mac

Share this post


Link to post
Share on other sites

I have had my wifes 03 230 up to 7500ft with the stock jetting and it ran just fine. No mods to the pipe, air box opened up on top. I went one tooth less on the countershaft sprocket so the bike could go as slow as possible or walking speed. At 3200ft where I live it's still good down low but a little lean on top. My wife needs smooth power and a low speed chug factor and this setup works, even with me on it.

Share this post


Link to post
Share on other sites

That's what I was wondering, since the air up here is thinner, whether the stock jetting would work if I uncork the 230. Guess I could try it and "Re-cork" it if necessary. Has anyone successfully re-installed the airbox snorkel?

Share this post


Link to post
Share on other sites

The airbox "snorkel" will go right back into place. At 6000 ft I think you could easily get by with a 115 main jet if you have pulled the baffles. The stock pilot and needle should work fine as well. You would need to ride the bike and compare the performance after making incremental changes just like MotoMac has been doing for his area and conditions. Test, test, test.

Happy tuning !!

Share this post


Link to post
Share on other sites

I've run my '03 230 at 6-7000ft with an FMF pipe and stock jetting many times. I had to back out the mixture screw a half a turn after taking out the snorkel, but still haven't rejetted. Asked two dealers, they both said "If it runs fine, don't mess with it".

Share this post


Link to post
Share on other sites

Uncorked the 230 over the weekend. I think I gained more noise than anything else. Maybe a little midrange. Also, the bike smelled like it was hotter than normal. I'd bet that rejetting would help, perhaps add some power at higher revs.

Once it was warmed up, there was no popping, blubbering or other weirdness though, just the unusual hot smell. I'm sure that was due to the leaner mixture.

I put the snorkel and silencer back on, they reinstalled easily. I'll get a power-up kit sometime and try again...

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

  • Similar Content

    • By hondahondo
      A few picks of my winter project.













    • By Australian Psycho
      So I want to fit a Speedo to my stock Honda CRF230F, I know people have fitted the Trail Tech endurance to them but they are a bit pricey so my questions are is there another reliable Speedo or is my best choice to bite the bullet and get the Endurance? My other question is the stock stator for the CRF230F enough to power a Speedo or more specifically a trail tech endurance 2? I fully capable of installing it and splicing the wiring, my question is just can the stock bike support it? Also the Bike does not have a headlight.
    • By StreamZ
      I am in the process of slowly repairing everything on my 230 that had been bought from a farmer and obviously had no love ever in its life. Anyway, as I pull off one thing, fix it, reinstall it and then ride around again, I keep coming back to it not being the most aesthetically pleasing 230 on the planet. I was wondering if anyone has suggestions for sticker kits leave 'em below.
      FYI: I would like to keep it as stock looking as possible maybe even use the sticker kits from the last couple years of motorbike.
    • By Daniel627
      I hate finding awesome deals, but not able to make it happen! 
      I found a complete '05 crf150f that I would love to get for the gf and get running. He wants $400 obo. It's a 7 hour drive though. I would have no problem making the drive normally, but even if he'd take $300-350, it would still cost me about $150 in gas. I can't really justify spending the money at this point in time and that sucks balls! 
      I just had to rant for a moment
       
    • By Dumpdaveinfl
      Hey guys, 
      Just  finished my xr and wanted to share some pictures with what I done. I have read a lot of posts on suspension for the xr, so I’ll share my mods.I got a set of dnm hornet forks from my wife on my birthday. With a new front I had to do a conversion on the back-so I went with a Crf150f swing arm that got off eBay. After some machine work in a Bridgeport mill removing 5/8 off each side it fit. I removed extra 1/4 inch to allow for chain alignment so it could be shimmed. The  frame was over drilled to 14mm and had to shorten the bolt by removing the bolt head and re-weld a nut to the stud. The shock is temporary until I figure linkage or direct mount but for now it’s a 11 inch fast ace 1100 lbs with adjustable rebound. Also for ease of service I drilled and taped the swinger and shock pivots with 6mm zerks. The wheels are the stock Crf150f and installed Ebc slotted brake pads. 
      The DNM front forks were a challenge as no bearing combination would work with the 41mm race. I used a set of roller taper stock bearings and shimmed the bearing to the triple stem. Brake caliper had to be modified with a new bracket to use the 240 rotor. Also I have yet to find information to support these forks so if anyone has information on these please let me know.. 
      35inch seat height
      as for the rest of the build the motor has a engines only 120 kit with cam and slotted cam sprocket and mikuni tm24 carb. Shower head and oil pump by Daytona and alto red eagle clutch with bbr springs and a hydraulic clutch. Cdi and coil, new seals. installed a bbr  cradle with engines only aluminum front mounts. Had to remove 2mm off the engine and frame dowels to get these to work together. A new seat cover and foam with a clean up on the plastic. Let me know what you think. Thanks
       
       




×