looking at new klr 650 backfireing - 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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post #1 of 6 Old 08-04-2010, 09:21 PM Thread Starter
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looking at new klr 650 backfireing

2000 klr 20000 km or 12500 miles .Doo hasn't been done . Just wondering when you let off throttle it backfires should this be a concern ?And only when riding not when idelling .Is there any signs the doo needs to be done ? Thanks in advance .
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post #2 of 6 Old 08-04-2010, 09:57 PM
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A little backfire on deceleration is normal for many large bore singles. The carb is a little lean and can be fixed with a simple air mixture adjustment. Some also raise the carb needle which pretty much eliminates the backfire completely. The "doo" can be a weak spot on the early models but that too is a fairly simple fix with Eagle Mike's upgraded parts. If you are not mechanically inclined you can always attend a tech day where you will get all kinds of help with the project. If the bike is running smooth I would doubt that there is anything wrong with the doo at this time unless its been a hard 12,500 miles. If the price is right, jump in and start having a great time.

Greg
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post #3 of 6 Old 08-11-2010, 02:13 AM
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Just did the 22 cent mod (engine idle screw adjustment & 2-#4 SS washers under the needle). Also pulled out the "snorkle" from the air intake, and installed a PCV valve on the breather tube, what a difference! 2007 with almost 18,000 miles and this bike is running like a thoroughbred. Whoever dubbed it he 22 cent smile-maker was spot on. I also did the "doo", spring was intact, lever was missing top half, replaced both, smoothed out the engine considerably. But I think if you try the mods above, your backfire issue will disappear.
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post #4 of 6 Old 08-11-2010, 08:21 AM
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Quote:
Originally Posted by shadowace View Post
2000 klr 20000 km or 12500 miles .Doo hasn't been done . Just wondering when you let off throttle it backfires should this be a concern ?And only when riding not when idelling .Is there any signs the doo needs to be done ? Thanks in advance .
A good question to ask a seller is if he has done the Doo and then get his reaction on the need for a replacement. If he doesn't know what the Doo is then it's likely he hasn't adjusted it either. You would probably hear that on a bike with that mileage.

When I bought my bike the seller laughed at the need to replace it. When I took it apart I noticed that the Doo had wear on it from the starter gear hitting it likely on an improper adjustment. I wonder if he decided to sell the bike because of the noise that would have made.

What is your location? Sounds Canadian, and what is the price?

My Kaw Barn - 2004 KLR, 2006 Concours (sold), 1997 Bayou 400.

"It's a friggen motorcycle, it's not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you shit your pants every now and then. "

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post #5 of 6 Old 08-11-2010, 09:50 AM
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Quote:
Originally Posted by shadowace View Post
2000 klr 20000 km or 12500 miles .Doo hasn't been done . Just wondering when you let off throttle it backfires should this be a concern ?And only when riding not when idelling .Is there any signs the doo needs to be done ? Thanks in advance .

Check the exhaust header to cylinder bolts and the header to muffler bolts. Leaks at those spots will cause decel backfires. Popping on decel is somewhat normal because it's lean on the low circuits, the .22 mod will take care of most of it.

Always replace the doo on the 1st gen bikes.

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #6 of 6 Old 08-13-2010, 06:11 PM
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Quote:
Originally Posted by shadowace View Post
2000 klr 20000 km or 12500 miles .Doo hasn't been done . Just wondering when you let off throttle it backfires should this be a concern ?And only when riding not when idelling .Is there any signs the doo needs to be done ? Thanks in advance .
Replace the doo asap,,,those give no warning when they fail,,and your risking destroying the motor if you dont,,not trying to be a wet blanket about it,,,but at the very least,,,pull the cover,,left side,,,and get a small flashlight and look at spring,,,lever,,, if you can . Its hard to see
without pulling the rotor off,,,but you can see most of it.
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