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Old 02-13-2013, 01:52 PM   #41
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Default Re: How To: MC Mod

Quote:
Originally Posted by Noobens View Post
The person whose bike is in the pictures says he didn't really feel a performance increase, but that the bike definitely seems to run smoother.
That's me!

I haven't had a chance to do the usual flint hills ride to test this out (familiar trails, familiar gearing, speed, etc) ... it being winter and all. What I have noticed, though, is that it runs smoother now and more quiet (though not as smooth nor quiet as your KLR ). Also, the starting is better and, you are right, the popping on decel was reduced to almost nil. I don't know if it's because of the cam mod, the adjusted valves or both.

I'll let you know come spring if the "grunt" is noticeable when we go through the "cattle pens" area. Either there or we need to bring our bikes to the "dunes" to really test out all our winter mods.

The big thing for me is that so far I have not seen any negatives with the cam mod. That is good by my book
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Old 02-15-2013, 07:18 AM   #42
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Default Re: How To: MC Mod

yes seems real nice ill do mine soon i guess!

do u have to adjust the mixture after u do it?
or after u open for more air?

this should work the same for a klx650 right?
less poping would be nice there!

thx!
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Old 02-16-2013, 04:46 PM   #43
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Default Re: How To: MC Mod

I just did mine and the arrows still line up! So either it was off to start with or it didn't move.
Can someone confirm that there should be 46 link pins between the marks (https://klr650.marknet.us/chaintiming.html) before the mod and 47 after?

Is there another way to check without taking off the chain guide?
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Old 02-16-2013, 05:11 PM   #44
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Default Re: How To: MC Mod

Quote:
Originally Posted by newklr View Post
I just did mine and the arrows still line up! So either it was off to start with or it didn't move.
Can someone confirm that there should be 46 link pins between the marks (https://klr650.marknet.us/chaintiming.html) before the mod and 47 after?

Is there another way to check without taking off the chain guide?
That's why I suggested taking note of where your arrows are BEFORE you begin. You will need to pull the chain guide to count the pin links accurately. It's likely that you set it back to where it started. It's easy enough to do. You are correct in assuming it should be 46 pin links, but if both cams are sitting flush with the head then you're still at stock timing. On the models where the lines don't exactly line up with the head, they are BOTH angled slightly off. So if both are flush with the head, you didn't change the timing.
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Old 02-17-2013, 01:58 PM   #45
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Default Re: How To: MC Mod

This is very cool!! I have had a slight vibration ever since I did my last valve adjustment. I have a ton of parts coming next week and I am planning on taking the bike down for a bit when they get here. this is the perfect time for me to redo my valves and do this mod. I don't really want any more power (yeah right) but less vibrations would be awsome!!!

Chris
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Old 02-17-2013, 02:55 PM   #46
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Default Re: How To: MC Mod

Quote:
Originally Posted by newklr View Post
I just did mine and the arrows still line up! So either it was off to start with or it didn't move.
Can someone confirm that there should be 46 link pins between the marks (https://klr650.marknet.us/chaintiming.html) before the mod and 47 after?

Is there another way to check without taking off the chain guide?
I think saw a post on this thread or perhaps another giving a tip that would be helpful. When you put the gears level with the head and the T mark lines up, mark the cam gears and chain with corresponding marks. The chain and cam gears will have a tooth and link to indicate where your starting point is for reference. After you move the exhaust cam you should see the change in the position of the marks on the exhaust cam by one tooth. I use this on cars as a quick reference to ensure that the marks are where they were when I started.

Does this make sense? Have fun.
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Old 02-18-2013, 11:07 PM   #47
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Default Re: How To: MC Mod

The arrows on my '06 cam sprockets are rotated slightly counter clockwise (about half a tooth) when the crank is at TDC. I set it up with the (free) MC mod today and it really pulls well throughout the usable RPM range. I will keep it this way.
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Old 02-20-2013, 01:50 AM   #48
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Default Re: How To: MC Mod

Any way that we can get this moved to the How To section? (I know it's my own darn fault it ended up here in the first place )
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Old 02-21-2013, 05:28 PM   #49
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Default Re: How To: MC Mod

Okay, so I did the mod to my 2011.
I also added a GPR exhaust and modified the mainjet for the new exhaust.

I can confirm everything that others also wrote before: less popping, more power 3k up, my 17T front sprocket feels more powerful than the 15T before.

But,... and this wasn't mentioned before. The sound at the motor has changed.
Since I never had a aftermarket pipe I can't tell if those change the sound on the header pipe side.
In the front of the motor I can hear really loud "explosion" like sound. First I thought my header pipe might have loosened while I switched the pipes. But no change.

I'm sure I did just rotate counter clockwise by on tooth and I didn't move the intake cam. Well it had a little play but this shouldn't result in big issues should it?

Does it make sense that now that the exhaust cam opens earlier that the there's higher pressure going into the exhaust and this might lead to a different/noisier sound?

Anybody else recognized something like that?
The motor was easy to turn by hand,... no noised coming from the inside.

Sebastian
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Old 02-21-2013, 05:42 PM   #50
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Default Re: How To: MC Mod



Never mind! The AIS hose jumped off !

Okay, then let's rip the plastics off a second time

Sebastian
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Old 02-21-2013, 06:33 PM   #51
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Default Re: How To: MC Mod

Quote:
Originally Posted by Sebastian101 View Post


Never mind! The AIS hose jumped off !

Okay, then let's rip the plastics off a second time

Sebastian
Glad you got that solved, Sebastian!

Best,
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Old 02-24-2013, 01:22 AM   #52
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Default Re: How To: MC Mod

i finally got the bike back on the road after a major tear down that included the "mc mod".

wow, the bike is incredibly smoother... this is how the engine is SUPPOSED to run. feels great... i can't comment on any power increases but the bike runs awesome...
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Old 03-03-2013, 12:33 PM   #53
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Default Re: How To: MC Mod

Did the MC when I checked my valves. I had one exhaust theat was pretty tight so I opened it up and did the MC at the same time. Seems like the low end lug is much better. better acceleration too. Bike is running great.

One thing I did notice is I seem to be having some noise from the lower chain case now. just a slight whirr. I can only hear it at idle. I adjusted the doo and it seemed to help a bit. Even smacked the case with a hammer to help it adjust.

Chris
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Old 03-03-2013, 12:41 PM   #54
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Default 2008 klr 650 Carb HELP

2008 klr 650 Carb HELP

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Just put the DG r series pipe on and also did the 22 cent mod and drilled slide to 7/64ths. Drilled top of air box as well...... Runs great when warm....

When cold the bike doesnt want to start with the choke full on??? Should I try next size lerger main jet and provide more gas???
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Old 03-03-2013, 12:58 PM   #55
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Default Re: How To: MC Mod

Doing the mod at this very moment. Waiting for the Mrs. to return with a new spark plug.
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Old 03-03-2013, 03:37 PM   #56
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Default Re: How To: MC Mod

Are you putting the DG slip on exhaust?
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Old 03-11-2013, 08:17 PM   #57
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Default Re: How To: MC Mod

Ok, I got the chance to perform the MC Mod on a '09 KLR685.
Bike had peviously had -.010" KACR mod for better cold starting.
Current Cold Cranking Compression 127 PSI.
LH exhaust was <.006"--change to <.010". RH exhaust was <.008--change to .010"
Intakes were---->.007"--------------------------------------------.008"

After valve adjust and MC Mod, Cold Crank Compression NOW 152 PSI.

Most of which I beleive was gained by MC Mod.
Does not quite prove my theory because IT needed valve adjust.

BUT, you all need to understand, KACR timing or closing degrees affects starting compression, for the BETTER.
LOBE timing is WHAT makes it RUN BETTER! Which is what EM and MC are primarily after.
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Old 03-22-2013, 11:40 AM   #58
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Default Re: How To: MC Mod

Does anyone have any real world miles on how this mod will effect the longevity of the engine? I am very interested in this mod for my '09, and was just curious.

Thanks,
Damon
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Old 03-22-2013, 12:02 PM   #59
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Default Re: How To: MC Mod

Quote:
Originally Posted by damonster View Post
Does anyone have any real world miles on how this mod will effect the longevity of the engine? I am very interested in this mod for my '09, and was just curious.
Same question here.
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Old 03-22-2013, 06:17 PM   #60
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Default Re: How To: MC Mod

I've been through about 2 tanks of gas. It hasn't blown up yet. Seriously guys, it's only one tooth of advancement. How you maintain your bike will have a much larger impact on longevity than this mod.
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Last edited by Noobens; 03-22-2013 at 06:18 PM.
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