HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
redmanrandyed

Replace jet or adjust clip?

10 posts in this topic

My BRP is bogging down when I ride around 7000' in elevation. :)

I live around 4500' and the bike does well at this elevation. I ride around 4500' to 9000' plus.

I currently have the 172 main jet installed, needle clip in third position. I beleive it is running too rich and that is why it is bogging down in higher elevations? It runs well at 1/4 throttle at high elevations but if you rev it up to shift into second it bogs down terribly.

Should I move the clip or go with a 170 or 168 main jet? Is there something else I could try?

Thanks in advance,

RED

Share this post


Link to post
Share on other sites

I would say you are definitely too rich on the main. I live around 4000' and the 172 runs rich here. At 7000'to 9000' you probably need to go even smaller than 168.

Share this post


Link to post
Share on other sites

I'm running a 165 main with the up grade neddle on the 3rd clip. I ride sea level to 6000' and I have no problem. I say drop the main to 162-165

Share this post


Link to post
Share on other sites

Simple solution: Drop the main to a 160 for over 8k, use a 165 at 4k. Set the clip in the middle.

Make sure the bike is uncorked properly; 40mm intake boot, airbox baffle plate and snorkel removed, and use either the 40mm exhaust tip, or modify the stock tip to 34 or 36mm.

I ride my bike from 8k to 12k regularly during the summer, using those settings. It never bogs or sputters. For the bike to run rich enough at the lowest elev. of 8k without getting too hot, the bike should be jetted for such. Slightly over-rich running above 10k feet is ok and desirable to prevent overheating when the going get's slow on the steep rocky switch backs. Also, the thinner the air, the less cooling you get from it.

Going overly rich, such as a 175 jet at 9k, is bad not only because it runs horribly, but also the extra fuel can wash the thin film of oil off the cylinder, causing excessive engine wear.

LL.

Share this post


Link to post
Share on other sites

I also agree with everyone above. Go leaner on the main and your bike will run better.

Share this post


Link to post
Share on other sites

the extra fuel can wash the thin film of oil off the cylinder, causing excessive engine wear.

Excellent point! That's something that I've argued about and tried repeatedly to get across to buddies of mine who run their bikes pig rich thinking they're doing it a favor. :)

Share this post


Link to post
Share on other sites

No kidding Rusty_2? Funny thing, I've had the same trouble trying to explain that idea to friends of mine also!

L.L.

Share this post


Link to post
Share on other sites

All this bickering? I am leaving sea level with a perfect running big gun race core, uncorcked @175 jet, going to Colorado (Black Bear, Engineer, Cinnamon, Imogene then Pearl pass, Italian Creek. Off to Colorado cycle fest for 2 more days of dual sport. I just finished doing the Quiet core full repack and a 155 jet, hopefully I nailed it? But I will carry a 165 just in case? Any one? Any one? :)

Share this post


Link to post
Share on other sites

Billoyd,

I guess with the bung hole pluged up like that you should be able to get away with a 155-160 main. Wazn't stock a 152? :)

Share this post


Link to post
Share on other sites

Need to get another tail section to handle the top speeds and hot sauce in Baja! But 3 or 4 times a year, have to put a muzzle/butt plug for the Feds!!!! Tough to keep everyone happy?

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

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0