Stage 2 and airbox mod - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

 
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Old 02-10-2014, 04:34 PM Thread Starter
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Stage 2 and airbox mod

I had the Dynojet Stage 2 jet and needle installed. My airbox had 4 holes cut by the PO.
When I got the bike back the mechanic had blocked off the drilled holes. Should I unblock them? He said it was running rich I thought it would be the other way around more air/fuel..
Im in a quandary.

thx

Last edited by Jeepflambe; 02-10-2014 at 05:23 PM.
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Old 02-10-2014, 04:58 PM
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That makes no sense

More air, as would be supplied by a modified airbox means a lean condition as a rule. Remember it's a air/fuel mixture. Might want to think about a jet kit. I bought a dynojet kit for my 09, followed the instructions and could not be more pleased, it runs better than ever.
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Old 02-10-2014, 07:11 PM
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Quote:
Originally Posted by Jeepflambe View Post
I had the Dynojet Stage 2 jet and needle installed. My airbox had 4 holes cut by the PO.
When I got the bike back the mechanic had blocked off the drilled holes. Should I unblock them? He said it was running rich I thought it would be the other way around more air/fuel..
Im in a quandary.

thx
As mentioned above, generally, you're right. The jet kit alone could have produced a fuel-rich condition, air box holes or not.

Don't know if the "too-rich" determination was made with an exhaust gas analyzer, a plug reading, or . . . intuition.

No great harm would occur, IMHO, if you re-opened the holes, if you think you'll achieve desired performance improvement. You might try the air box both ways, sealed and opened, to see if you can detect any significant difference in operation and performance.
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Old 02-10-2014, 07:39 PM Thread Starter
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This evening I opened up the holes in the airbox and wow! What a difference in throttle response. I didnt take it for a ride coz its -20 c with a breeze and light flurries and my driveway is all ice and snow.
Anyhow to make a long story longer the rich condition was determined by a whiff of black smoke on a crack of the throttle. Theres still a little smoke`but that doesnt really bother me. Id rather have it a little rich than too lean. I cant wait to actually ride the recent carb work. Only 2 months to go.
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Old 02-12-2014, 11:29 AM
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you did the right thing; the new jetting didn't work with the stock, bottled up airbox.

The airbox/air filter is the biggest restriction on these bikes. make sure you run a good filter too; Uni or Twin Air.

Dave
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