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Discussion Starter #1
I recently decided to drop a tooth up front... easy mod right?
Of course it is, I just like to make things difficult!! So you know the drill loosen the back tire and chain, front cover and sprocket off, remove retaining screws and clip,
 

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My question to you...
What are your rpm's at 70 mph?

I am thinking about this mod, but it seems my bike is already screaming at 70-80mph.
Stock 02 M 750

Maybe I am still not accustomed to having a motor rev that high while cruising at 70
 
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Discussion Starter #3
Yeah I am not really clear on this mod either. Does it increases you 0-60 time, wheelie power, or what. With the mod you are going the same speed but the rpm's are higher? Why would you want this?
 

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Most folks drop one tooth in the front, or add a couple in the back to improve low speed handling and stoplight takeoffs. Basically you reduce the overall gearing so that the engine isn't lugging so much in first and second. (There's a rumor that this was an EPA plot...) Most like the change since maybe 50-60% of your real-world riding is under 40 mph. The downside is that it reduces your top end somewhat, but hey, who wants to hold on at 130 all day? No fun.

Oh yeah, it should make wheelies easier. ;D

On my '00 900 I'm doing about 5000 RPM at 80 MPH with a 41 tooth rear (was 39). Lots of room to go quicker if I want.
 

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On my '99, stock gearing (15/39) put me at 5000 RPM at 80 mph.

I've changed to 15/41 and now turn about 5200 RPM at 80.
I don't think the 200 rpm is a big deal.

Take offs are much smoother. It really winds up quicker and I even feel that it shifts better when aggressively running through the gears.

Because the final drive is shortened, I've effectevely made it a "closer ratio" setup.

I find that cornering is often better because I can do a lot of corners in 3rd now that would previously lug in that gear, yet rev somewhat too high in 2nd. I suppose the ideal gearing depends on the "track", but it seems that for my real world riding, the new ratios work better.
 

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i'm down one tooth on the front (14 from 15) and can't recommend this mod enough. makes riding around NYC almost a joy.

i am running a hair over 5k at 80 in 6th. tough to tell with the dorky LED tach.

cheers!
steve
 
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Discussion Starter #7
My 70MPH RPMs are about 5300, with the 15t probably about 4800. I love the mod. Really easy to take turns in 2nd, and 3rd gear, overall low end performance is great! As far as 0-60 times I have no idea, it certainly seems faster but I never have tested it. The front end does come up ALOT easier also. You will be happy if most of your driving is done below 100 mph. I'm even thinking of going up 2 teeth in the rear as well.
 
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Discussion Starter #8
This is a mod that I am going to do.

The stock gearing on these bikes is ridiculous! First and second gears are outrageously tall.
 
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Discussion Starter #9
Definitely one of the easiest and best mods. Like everybody said, around town is much more fun when you have more power at the flick of the wrist. beware of the front end coming up easier though ;D
 

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I know that going down one tooth in the front is close to, two up in the rear.

So which one would raise your rpms more at the same speed?

Also is changing one better than the other for durability purposes: engine, chain , gearbox, or sprocket life

This mod is looking better and better... so where can i pick up a front or rear sprocket ;)
 

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The front is easier and cheaper to replace.

The difference in ratio between the two approaches is pretty much negligable.

Some have experienced problems with chain rubbing and wearing the swingarm when going to the smaller front.

My shop (BCM) is adamant that a 14 is a bad idea on a Monster. Others on this board have had no problem with it.

I went with the 41 rear instead. Other than slightly more cost, there's no downside, so I took the conservative road.
 

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14 tooth front on my 750 and I love it. GREAT mod. I haven't notices any problems with the wear on the swingarm guard...yet.
 

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I decided to get the 14 tooth up front. Removed the guard, loosened the back wheel and chain, removed the retaining bolts, removed the clip, attempted to slide sprocket off and the chain hits the slave cylinder?, It doesn't seem to have enough room to slide the chain off the front sprocket and only slide the sprocket off. I might not be explaining my problem well, but do I need to loosen or remove the slave cylinder to allow everything to pass by. I seem to be the only one with this problem. By the way I have an 02 620. Any advice would be great. Thanks
 
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Discussion Starter #14
I forgot to mention that part!
Thanks for reminding me, Yeah I just loosened it a little ways so I could get the chain off the original sprocket. I don't think you need to take it all the way off, just enough to pass things by. GOOD LUCK!
 
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