Mc mod?? - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

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post #1 of 41 Old 09-24-2018, 02:34 PM Thread Starter
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Mc mod??

I stumbled across this mod( advance exhaust cam 1 tooth) and wondered why there is not more discussion on it. I had some valve noise on my 2009 with just over 7000 miles so I checked clearances and they were all tight. Intake is .004 both, Exhaust is .006,.005. I am waiting for shims. Anyways with the possible gains from advancing exhaust cam, why isn't this a more popular mod? Any and all opinions welcome. OK There is plenty of discussion about this mod here on the forum, just none lately. I'm still new to this (5 months) apologies for my ignorance

Last edited by beamwalker; 09-24-2018 at 02:48 PM. Reason: read more
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post #2 of 41 Old 09-24-2018, 07:22 PM
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Merit in the, "MC," mod, IMHO, requires a leap of faith.

Some pre-2008 owners report no gain; some post-2008 owners report power increases at different rpm (seat-of-the-pants dynamometers).

Your bike; mod it the way you like.

BTW, ever hear of the, "PCV VALVE" modificagtion? Some claim many diverse advantages from this procedure, including increased power.
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post #3 of 41 Old 09-25-2018, 12:00 AM Thread Starter
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Thanks for the response "D".I have heard of the pcv mod, advancing the cam costs nothing since I was in there. I still may try it though. As you have stated gains are relative . "Build it and they will come"
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post #4 of 41 Old 09-25-2018, 10:14 AM
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There are tons of threads on the subject but unfortunately many search engines have problems with two or three character words .....like MC for eg!

My 2 cents; On a Gen2, I'd probably try it......potentially you gain a little mid range tapering off at the top. perhaps a bit less engine braking too which you may like....or not. Results vary; from EM " The camshaft drive sprocket on the crankshaft varies in timing" from bike to bike.

On a Gen1, I've heard mixed results - enough so that I haven't bothered trying and don't intend to.....after all, we're talking maybe 1hp (less at peak)




If you really want to get into trying to maximize the KLR's performance (a bit of an oxymoron) these guys make adjustable cam gears and scoff at the MC mod; https://www.klrchris.com/klr650-adjustable-cam-gear/


My thoughts are that I trust Eaglemike; he knows his stuff. Since the MC mod is free, I'd try it on a Gen2. Gen1's have a different exhaust cam and don't seem to get the same benefit. Results seem to vary between bikes probably because of slight tolerance differences between factory timing. I wouldn't bother with expensive adjustable timing gears because I think the "bang for the buck" is on the low end of the scale.......spend the money on suspension mods where you really can make a difference. Lastly, forget the PCV mod! ;-)


Cheers,
Dave
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post #5 of 41 Old 09-25-2018, 10:58 AM Thread Starter
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Thanks for taking the time....I assume red are with the cam advanced on chart?
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post #6 of 41 Old 09-25-2018, 11:11 AM
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Originally Posted by beamwalker View Post
Thanks for taking the time....I assume red are with the cam advanced on chart?
no problem and yes.

Dave
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post #7 of 41 Old 09-25-2018, 01:19 PM
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Quote:
Originally Posted by beamwalker View Post
I stumbled across this mod( advance exhaust cam 1 tooth) and wondered why there is not more discussion on it. I had some valve noise on my 2009 with just over 7000 miles so I checked clearances and they were all tight. Intake is .004 both, Exhaust is .006,.005. I am waiting for shims. Anyways with the possible gains from advancing exhaust cam, why isn't this a more popular mod? Any and all opinions welcome. OK There is plenty of discussion about this mod here on the forum, just none lately. I'm still new to this (5 months) apologies for my ignorance
The MC Mod is 'free to try & free to reverse' if one already owns a 40-200 INCH Pound Torque wrench. Like my 4 basic PDW Oil Flow Mods, totally reversible.

The KLRChris adjustable cam sprockets can apparently make quite a difference or just some improvement, which all depends on how close to original blueprint your entire engine is to spec (Probably Not Very Close).

But one needs a couple more specialized tools and the knowledge & patience to use them. The KLRChris adjustable sprockets (after core exchange) are less expensive the Soupys Adjustable Suspension Links. So price of the parts should only be of minor consideration IMHO for those truly interested.

Read this thread,
https://www.klrforum.com/2008-klr650...am-timing.html

Read this 5 part Cam timing website, by our own Tom Schmitz aka Souperdoo.
https://www.souperdoo.com/stuff%20th...g-cams-that-is

You've already got the link to KLRChris.

And do not waste your time and a destroy a perfectly good crankcase vent hose with an in-operable at riding speed pcv valve!

Just my honest opinions.

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 84,000+ miles & counting
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post #8 of 41 Old 09-25-2018, 01:45 PM
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Yep, it's hard to argue with the cost of the MC mod. To clarify; for ME the $235 plus shipping, duty, time and tools for the adjustable cam gears is more than I'm willing to invest to chase a potential hp or two.....others can and will have different priorities and there is nothing wrong with that.


Dave
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post #9 of 41 Old 09-25-2018, 08:54 PM Thread Starter
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Starting to realize my 2009 with 7000 + miles is burning approximately a quart per 1000 miles, approx. 70% of that highway 5000 + rpms. Nothing to be alarmed about is it? I am starting to consider 685 kit to stop oil consumption, if that is a remedy
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post #10 of 41 Old 09-26-2018, 12:55 AM
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Quote:
Originally Posted by DPelletier View Post
Yep, it's hard to argue with the cost of the MC mod. To clarify; for ME the $235 plus shipping, duty, time and tools for the adjustable cam gears is more than I'm willing to invest to chase a potential hp or two.....others can and will have different priorities and there is nothing wrong with that.

Dave
I heard about the miraculous free MC mod and advanced the exhaust cam one tooth when I had the cam cover open. Couldn't tell any difference so I moved it back the next time I had the cover off. Still couldn't tell any difference. If I don't notice it, it's not worth it.

KLRchris does offer a right side stand which has come in handy for me on several occasions. Mostly when i pull off on a right side shoulder sloping to the right and the left side stand tries to push the bike over to the right.
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