KLR 650: less and less power over the years - Kawasaki KLR 650 Forum
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post #1 of 11 Old 08-06-2018, 02:19 AM Thread Starter
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KLR 650: less and less power over the years

When the KLR 650 was introduced in the late 80's its power output was quoted at 48hp (35 kw). Then due to emission and noise regulations it got less and less so that my 2007 is rated only at 34 hp (25kw). I would like to get the bike up to the 1988 35kw. What has been done and what needs to be changed to derestrict it?

Cheers Lars
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post #2 of 11 Old 08-06-2018, 12:17 PM
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Do you know at what location those two powers were measured? I think the 34 hp is at the rear wheel. The 48 hp may have been measured at the crank shaft.
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post #3 of 11 Old 08-06-2018, 12:31 PM Thread Starter
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Do you know at what location those two powers were measured? I think the 34 hp is at the rear wheel. The 48 hp may have been measured at the crank shaft.
What confuses me is that in the official data of the bike there are different outputs. In 1988 when the bike came out Kawasaki Germany stated 48 PS (hp). Then in the 1990's the output in the magazines went down to 42 PS (hp). Now the power is stated around 35 hp on the "modern" ones. I understand that Kawasaki had to detune the bike in order to conform with noise an emission regulations.

Just curious how they did this and if it is reversible, eg to bring the engine back to 1988 spec...
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post #4 of 11 Old 08-06-2018, 08:34 PM
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Originally Posted by Lars Kessel View Post
What confuses me is that in the official data of the bike there are different outputs. In 1988 when the bike came out Kawasaki Germany stated 48 PS (hp). Then in the 1990's the output in the magazines went down to 42 PS (hp). Now the power is stated around 35 hp on the "modern" ones. I understand that Kawasaki had to detune the bike in order to conform with noise an emission regulations.

Just curious how they did this and if it is reversible, eg to bring the engine back to 1988 spec...
Well Lars then explain this, the KLR 650 A, B, C & E series engines from 1987 to 2018 have Never been able to pull more than about 105 MPH (168 kph) indicated on the lying speedometers, regardless of their posted ratings in the various countries, to the best of my knowledge!

Real speed of about 95 mph. Sorry to disappoint you.

Some countries even require them to be restricted to about 65 mph!
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post #5 of 11 Old 08-07-2018, 10:55 AM
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Originally Posted by Lars Kessel View Post
When the KLR 650 was introduced in the late 80's its power output was quoted at 48hp (35 kw). Then due to emission and noise regulations it got less and less so that my 2007 is rated only at 34 hp (25kw). I would like to get the bike up to the 1988 35kw. What has been done and what needs to be changed to derestrict it?

Cheers Lars
There is no appreciable difference in output in ANY year KLR and engine changes have been very minor and some were not for the best. There were the 1996 changes (one pce balancer sprocket, gearing changes, output shaft sprocket attachment, valve cover), none of which affected the power. The 2008 got different piston/rings which turned out badly along with AIS, an emissions change on the exhaust cam, and some other minor changes; again, no appreciable change in output. 2012: clutch dropped a plate.......other minor Gen2 changes include the addition of a carb inlet filter....this is all off the top of my head so I may have missed a minor detail or two but....

Bottom line is that any advertised HP difference is the same as the advertised Gen1 weight of 337 lbs and the Owner's manual mentioning 6th gear: complete fiction.


Cheers,
Dave
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post #6 of 11 Old 08-07-2018, 10:58 AM
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The only exception is that (as Paul mentioned) some markets came with a "learner restricted" setup which included an additional hole in the slide that limited output; Australia for eg. Again, engine output is the same once the slide hole is blocked.

approximately 34hp at the rear wheel is what all year KLR engines produce when running properly. you can get another 2-4 with a KLX Jet kit, snorkle-ectomy/air box mods, decent filter and good silencer. 3-4 hp boost is available from the 685 BB kit. Beyond that you are looking at cams, porting.....or maybe one of Eaglemike's 719 kits......but even all that won't likely get you much past 45-50hp.

The KLR "is what it is". The desire for big HP (i.e. 50-60) is an itch best scratched by another bike......the KTM690R comes to mind.

Cheers,


Dave
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Last edited by DPelletier; 08-07-2018 at 11:04 AM.
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post #7 of 11 Old 08-07-2018, 01:21 PM
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Having owned a few Ducatis with high hp and torque and now riding around on KLRs, I just don't understand the desire to boost so much power out of the KLR. I think it puts out just the right amount of power. I've never been in a KLR situation where I just didn't have the power I needed to do what I was doing.

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post #8 of 11 Old 08-07-2018, 09:27 PM
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It sounds as if the KLR's power has been pretty constant over the years. Is yours a case of wanting to optimize power...or needing more? In the former, there's a few 'easy' things you can do if not done already in order to realize a modest increase. As for the latter, it sounds like you'll need to perform significant mods to get into that neighborhood. Least, that's the way I read the posts.

Alan
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post #9 of 11 Old 08-08-2018, 02:54 PM
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What's the best aftermarket cam out there? Since they have to come out to do the valves?
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post #10 of 11 Old 08-10-2018, 05:48 AM Thread Starter
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Found the detune due to holes in the slider and even different length on the German forum as well. I am not looking to get more power out of the KLR engine. I am just curious what has been done to the engine over the years in order to keep the smog and noise brigade happy. Reversing this to me is not tuning, its bringing it up to original spec.
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