Jump to content

Recommended Posts

Hi fellow thumpers,

firstly if there is other threads on this topic I apologize.

 

i have a 2009 KTM 450 exc. I live at 5500 feet. I have a keihin carb. I currently have it set up with 

green needle (jd kit) @ 4th from the top

main #175 

pilot #42

 in setting it up for some desert riding I plan on doing next month (LAB2V). Right  now I’m getting a bog if I rack the throttle a few times. I’m reading this is semi normal as the accelerator pump has a hard time refilling.

i have put a new diaphragm, spring, lean jet is at #40 and air fuel acre 1 and 1/8 out.

 

im planning on going back to 172 main, red needle 5th from the top and #45 pilot.

i normally ride the trails around lake arrowhead and Big bear in California. The trails are single track from 5000-10000 feet.

 

Anyone see any issues with either set up?

how about the big if I get on it a few time ( not really noticeable when riding)

sorry for the questions. This is my first carb I’ve ever worked on. 

 

Thanks in advance 

 

Share this post


Link to post
Share on other sites

I just went through this on my '06 YZ450. Sent the carb to ZipTy Racing in Hesperia for a full rebuild, did wonders, bike is back to normal, crisp throttle, no bog, and general power output from 1/4-1/3 throttle is much better. If your bike was running fine, then all of sudden this problem came up, you probably need a rebuild, because bikes don't just UN-jet themselves. Many carbs from this era of bikes need full rebuilds because the many o-rings and other seals degrade and become leaky.

Share this post


Link to post
Share on other sites
10 hours ago, Chuck M said:

I just went through this on my '06 YZ450. Sent the carb to ZipTy Racing in Hesperia for a full rebuild, did wonders, bike is back to normal, crisp throttle, no bog, and general power output from 1/4-1/3 throttle is much better. If your bike was running fine, then all of sudden this problem came up, you probably need a rebuild, because bikes don't just UN-jet themselves. Many carbs from this era of bikes need full rebuilds because the many o-rings and other seals degrade and become leaky.

Yeah I normally use Ty. I was just trying to figure it out myself! It recently had a full rebuild. But I think your right I’ll give him a call and see get it fixed right. Thanks Chuck

Share this post


Link to post
Share on other sites

at that altitude you should get a bike with EFI then all the crap your going through now will become history you don't want to repeat

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:


×