Sprocket

vegetta58 · November 23, 2016, 08:35:15 PM

I commute to work on the interstate about 50 miles one way going anywhere from 70 to 100 mph. Thinking about putting the 18 tooth sprocket. Is it worth it. I dont wont to lose the power of the FJ but also dont want to run to high of RPM's all the time. Suggestions. Thanks Mickey

FJmonkey · November 23, 2016, 08:38:50 PM

Quote from: vegetta58 on November 23, 2016, 08:35:15 PM
I commute to work on the interstate about 50 miles one way going anywhere from 70 to 100 mph. Thinking about putting the 18 tooth sprocket. Is it worth it. I dont wont to lose the power of the FJ but also dont want to run to high of RPM's all the time. Suggestions. Thanks Mickey

18/38 or 18/37 will still give plenty of low end grunt and slightly better fuel economy. But you will still be looking for 6th gear from time to time.

aj52 · November 23, 2016, 08:57:37 PM

Quote from: FJmonkey on November 23, 2016, 08:38:50 PM
Quote from: vegetta58 on November 23, 2016, 08:35:15 PM
I commute to work on the interstate about 50 miles one way going anywhere from 70 to 100 mph. Thinking about putting the 18 tooth sprocket. Is it worth it. I dont wont to lose the power of the FJ but also dont want to run to high of RPM's all the time. Suggestions. Thanks Mickey
18/38 or 18/37 will still give plenty of low end grunt and slightly better fuel economy. But you will still be looking for 6th gear from time to time.

I am going to start with the rear rim swap with 92 slingshot rim.
Is the rear sprocket a normal suzuki sprocket? Does not have an offset or something.
Same goes for front,it is a normal FJ front.

Is that right?
Hannes

TexasDave · November 23, 2016, 10:24:29 PM

On my 84Fj went from 17/42 to 18/40. Much happier on the highway with the lower rpm's. Still have plenty of get up and go stop light to stop light. Even with the lower rpm's I am still searching for that elusive six gear at higher speeds.

Dave

E Double · November 24, 2016, 08:45:39 PM

I run an 18/39 on my '84. I definitely like how it rides with this setup. As others have said one will still look for 6th, just not as often.

vegetta58 · December 08, 2016, 05:16:22 PM

I'm fixing to put my order in to RPM. Is the 18/40 the way to go? I know how everybody has their own opinion, I just want to get it right the first time. Thanks Mickey

FJmonkey · December 08, 2016, 05:21:59 PM

The 18 will help when looking for 6th gear. The 40 gets you 1 tooth closer to a hard launch. www.gearingcommander.com

vegetta58 · December 08, 2016, 05:36:18 PM

So 38 sounds like the way to go, right? What size came on the bike originally?

FJmonkey · December 08, 2016, 05:39:45 PM

That depends on the year...

vegetta58 · December 08, 2016, 05:40:22 PM

1990

FJmonkey · December 08, 2016, 05:48:23 PM

Try this http://www.fjcatalogue.com/f/FJ_gearing_sheet.pdf

vegetta58 · December 08, 2016, 06:05:43 PM

Thanks for the link. So mine being a 1990 already has the 40 on the rear. All I need to order is the 18t front, see out it feels then change the rear as needed after riding?

FJmonkey · December 08, 2016, 06:13:42 PM

I am on 18/38, it suits my needs. I don't think 18/40 will be that much different. One tooth on the front is about 3 teeth on the rear.

aviationfred · December 08, 2016, 08:25:13 PM

I have ran a 18/38 set for awhile with a '92 GSX-R750 wheel. The FJ has plenty of grunt to absorb the gearing change. With the 1300 engine, I even went with a 19 tooth front for some long distance interstate riding. I would not recommend the 19/38 combo for a 1100/1200 engine for around town riding.

Fred

aviationfred · December 09, 2016, 08:16:35 AM

I have been asked to give some more information on my 19 tooth front sprocket. The sprocket that I have is made by PBI. I believe it is a one off, custom order. I found it on eBay. As far as clearance of the chain and the engine case. Here are a couple of photos that show the chain and the clearance to the engine case.

Fred

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