Larger rear sprocket.

[Blue1]

In the spring we'll pick a Sunday, my buddy on his SV1000 will probably come along.

 

[ferraiolo1]

Sounds good to me!

 

[storm42]

I ride as quickly as I safely can depending on the road I'm on. Slightly aggressive in traffic, 8 or 9 tenths in the mountains, and have been riding hi-perf motorcycles since the 70s. I am a well-accomplished street rider, but not a racer.

I do understand the math relative to torque, HP and rpms.

Harleys are tractors that have been out of date for 50 years.

Ducatis are high-revving twins; the FTR is a (well) modified cruiser motor.

I don't generally ride around the street at 6000 to 8300 rpm. The vast majority of all street riders are looking for max power maybe 1% of the time. Much more than that and they wouldn't still have their license.

Don't get me wrong, I love my FTR, but my old ZRX would chew it up and spit it out everywhere but under 3.5k rpm with 39cc less displacement and thirty lbs more weight and similar gearing. And the ZRX didn't need revs, it peaked at the same revs (or slightly lower) than the FTR.

I have only had my FTR a week, but I can say that my ZRX will blow it into the weeds. Not about that though, is it?

 

[ferraiolo1]

Haha. That thing will blow a lot of bikes into the weeds

 

[mark.lb]

How many seconds until you achieve escape velocity?

 

[Deleted member 706]

I'd be inclined to put a smaller sprocket on the back, but first I'd like to see the power curve. My gut feeling is that it revs high at the speed limit, hence taller gearing to drop the revs, give it longer legs and marginal improvement to fuel economy.

 

[storm42]

Haha. That thing will blow a lot of bikes into the weeds

It is a bit quick, re: sprockets, I made a mistake when ordering a new rear for this bike and ended up going 2 teeth up, lowering the gearing and shortening the wheelbase is the last thing this bike needed but I didn't notice my mistake until I road the bike, Doh.

 

[storm42]

How many seconds until you achieve escape velocity?

0 to a jail sentence is about 4 seconds, which was one of the reasons for wanting a slower bike, loving the FTR though.

 

[Blue1]

I have only had my FTR a week, but I can say that my ZRX will blow it into the weeds. Not about that though, is it?

View attachment 2145

Nice, you threw some coin at that 'rex!

I actually appreciate the suspension and brakes more than the turbo, but nothing wrong with tacking on another 30-50 hp...but I'd lose that goofy trunk, at least for pics.

 

[Happy Dave]

I replaced my rear sprocket & chain with a 46 tooth and at 90mph engine turns 5000rpm, I like it much better, I think that the engine has plenty of torque to handle higher gear ratio.

 

[ferraiolo1]

Where did you get that sprocket?

 

[Happy Dave]

I got the sprocket from sprocket specialists.or u can get one from rebel gear

 

[ferraiolo1]

Do they have the template already?

 

[MilwDave]

I replaced my rear sprocket & chain with a 46 tooth and at 90mph engine turns 5000rpm, I like it much better, I think that the engine has plenty of torque to handle higher gear ratio.

How many links did you need in the chain?

 

[Happy Dave]

How many links did you need in the chain?

I used a RK xw ring chain114 links. GB525GXW

 

[Pdiddy]

Just a mechanics input. 2 teeth on the rear sprocket amounts to an 8% ratio change. 1 tooth on the front 30%.

 

[ferraiolo1]

-1 on the front is about the same as +3 on the rear.

That said im still happy with my new 45t for every day riding.

 

[Max Kool]

@Pdiddy Not true.

Two teeth less or more on the rear means 2/49=~4%

One tooth on the front equals 1/16=~6.25%

 

[Max Kool]

Just a mechanics input. 2 teeth on the rear sprocket amounts to an 8% ratio change. 1 tooth on the front 30%.

Only with a 24 tooth rear sprocket and a 3 tooth front sprocket (sorry bud, you got your math wrong).

 

[Pdiddy]

Only with a 24 tooth rear sprocket and a 3 tooth front sprocket (sorry bud, you got your math wrong).

I stand by my statement.