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Hi, I am new here and just bought a 750 ACE. 03 model
I have heard that by changing the rear 41 tooth sproket to a 38 tooth gives a lot better performance.
Has anyone made this change and how did you like it?
Any pros and cons for this change? looking for all the help I can get.
 

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j2man said:
Don't worry about steel vs. aluminum get whatever is available.

-JSW
Aluminum will wear and distort much faster because it is a soft metal. The better value would be steel due to strength and durability. Stainless steel would be ideal if it is available. It's your bike and your choice but to me, an aluminum sproket would be like buying second rate.
 
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shojac said:
I have heard that by changing the rear 41 tooth sproket to a 38 tooth gives a lot better performance.
You don't gain "performance". You'll actually lose some. What you will get is lower rpms on the highway which makes for a much more pleasant ride.

A steel sprocket will last longer but aluminum will work fine. For long life, replace the front sprocket, rear sprocket, and chain at the same time.
 

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Changing the sprockets has it's ups and downs.

By going down in the number of teeth on the rear sprocket, it will lower the rpm while riding, Riders who choose to do so are usually riders who spend time on the highway's because the lower the rpm, the less vibration and it cruises along easier. The downside to this is when your in a city/town, the bike will lose it's get-up-and-go that most twins are good at. So, in other words, If you spend time on the highway then going down in teeth is a good idea.

Going up in teeth on the rear sprocket, has the opposite effect, It's better around town, but the rpms will be higher on the highway.

If your in between highway and town, Try going to a 39 tooth in the rear, That way your not so slow around the city, and you still took some rpms off the top-end. Going to a 36-37 is pretty much a highway only bike (not saying it still can't move around at low speeds, but not like a 40+ tooth bike would).

I'm pretty sure if you go to 39 or lower you have to shorten the links in your chain to (not sure)

Steel is tougher then alum. and will last longer. Most people will say to go to sprocket specialists (not that I have anything againist them), but I ordered a pair from bikebandit.com made by JT sprockets and they came out great, look great to (Rear sprocket is polished) and it is the same price as Sprocket Specialists sells them for.

Here's a like to JT Sprockets.
http://www.bikebandit.com/partsbandit/Manufacturer-Parts~mfr~JT+Sprockets~dept_id~1170244~iState~1.asp#

Just click through, and find your bike and it shows the available sprocket.
 

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I also went with a 39 teeth steel JT sprocket from bike bandit. I did notice some change, it made a smoother ride at highwayspeed. For the ride arround town, maybe the only thing you notice is the shifting point. (takes longer before you have to shift) And i think that my fuel milage improved slightly, maybe because of lower rpms.
Anyway, I would recomend it to any ACE rider.

btw. I didn´t have to shorten the chain
 

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"You have disturbed me almost to the point of insanity...There. I am insane now."

:lol:
Remember when SNL was funny?
Those were the days...
-K
 

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Kframe said:

"You have disturbed me almost to the point of insanity...There. I am insane now."

:lol:
Remember when SNL was funny?
Those were the days...
-K


Thanks for the comment... given the context of the responses here this pic is really funny :)

Here comes some more insanity:
1. What is up with these "Steel" freaks? I love steel, the front sprocket is always steel for good reason. I have owned a couple of performance bikes(r1 175hp, zx12r 190hp) and put ~30k miles on each without any noticeable wear on the rear Aluminum sprockets. What does a shdow put out 50hp? The rear does not need to be steel... steel is preferable just not necessary. For me availability was the driving factor here. For me the gains were far too beneficial to wait around for a steel 37t.

2. 39t is not far enough but requires less work. If I had to choose between 39t or 36t w/work I would go with the 36t hands down.

3. JT does not make a steel 37t otherwise I would have bought it and SS was back ordered >3 months for their steel 37t (I wonder why?).

4. I do not notice any loss in the off the line get up and go and I have a 37t. I do notice the drop in RPM at 80mph.

Good luck!
-JSW
 

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3. JT does not make a steel 37t otherwise I would have bought it and SS was back ordered >3 months for their steel 37t (I wonder why?).
The person I talked to at SS said it was due to some type of Customs or import issue, but didn't say at which end. They said they don't have the tooling to make the steel sprockets, only aluminum, so they import them.
 

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I also have the 39 tooth rear sprocket. To me, it made a big difference on the highway, but little difference in town. (longer between shifting gears)

A definate must do mod for the 750
 

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Glad to hear positive input on the 39 tooth swap.
I bought a 39T for the wife's SS750 and will be swapping it out this weekend. I really didn't want to drop the highway rpm dramatically, just take a little off the top. We ride a good mix of open highway and in-town riding and would ride 2 up only in an emergency on the SS750. The wife liked the idea of less vibration at speed but was a bit concerned about changing the way it "takes off", as she puts it. :D
Bought a master link too. I am happy to hear that I may not have to break the chain and use it too!
 

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I didn't have to remove any links for the 39T.
 

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I put a 39t sprocket on my ACE a couple of months ago. Definately worth it and quite easy to do (just be sure to loosen the bolts on the old sprocket a bit before you take the wheel off!)

Before the change (everything was stock), my chain was 1/2 way through the adjustment range. I didn't shorten it, but I now have very little adjustment room left (I will likely go to 120 links soon). I hear that you can put a new 120-link chain on with a 39t sprocket, but you might have to slip it over the axle to get it to fit. Many folks just ride with the 122 for a while and go down to 120 links when the chain stretches a bit.

I would have gone to 38t if I could have found one at the time (37t and 38t can be tough to locate).

Cheers, D-Mac
 

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I dropped to the 38t sprocket like 5 years ago and never looked back. I buy chains that are two links shorter than stock.

I really didn't notice any difference in the power at take off, and yes at highway, it made a HUGE difference.

It's well worth it, and wasn't very difficult to do.
 
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