gfolkert wrote:
Ask Tim Tinney.

He thinks 2000RPMs it to high for cruising at 55MPH. He wants another gear.

Personally, my bike tells me anything under 2000 is lugging.

I'd like a sixth gear, too. Don't matter though, I haven't of anyone here coming up with a way to do that mod ! ! ! (And that means that I probably can't be done.)

Not so much for cruising as for highway flying. Might help in the MPG dept. as well.





BD

Big Dawg wrote:
I'd like a sixth gear, too. Don't matter though, I haven't of anyone here coming up with a way to do that mod ! ! ! (And that means that I probably can't be done.)

Not so much for cruising as for highway flying. Might help in the MPG dept. as well.

MPG won't happen on a bike like ours with Gearing.

There are many things required for MPG, least of which is numerical reduction.

Rolling Resistance, Wind load, drag, internal engine efficiency, AFR and driving habits.

To prove my point on Numerical Reduction meaning pretty much nothing... lets take 4x4 trucks.

I've seen many trucks with large tires and about 3.70:1 gearing (many different makes have something close to that) and they are getting 13MPG, with RPMs at about 1600 at 70MPH. Now when many people swap out those ring and pinion gears for much higher ratios, some as high as (about) 4:88:1, but usually they go to about 4.30:1. That puts the RPMs at about 1850RPM at 70MPH. These people get as high as 18MPG running at a higher RPM.

I guess I'm saying that there are much more economical ways to get better mileage from our bikes than "coercing/convincing" a company to spend big dollars on a very small market (as compared to HD drive trains) for a 6 speed kits for a Roadstar. As far as Yamaha concerned, it will never improve the Roadstar in this way, ever. They will just replace the bike with a new one.

Big Dawg wrote:

I'd like a sixth gear, too. Don't matter though, I haven't of anyone here coming up with a way to do that mod ! ! ! (And that means that I probably can't be done.)

Not so much for cruising as for highway flying. Might help in the MPG dept. as well.

BD

You can go with a 33 tooth front pulley like I did. It isn't a 6th gear, but it drops the RPM a little.

with all that being said and done, peak max Tq occurs at 2200 to approx 3300rpm, of course that is if the AFR is at least 13.5 or a bit richer. doesn't have to be extra richer than that either, Tq is kind of flat even at a richer AFR, so why waste the fuel. If you want the Tq across a longer rpm range, then you need to change cams.

hows 45mph in 5th gear sound? really great, glug, glug, glug,...
i did figure out the lugging thou. (deep thoughts)

the fuel burns faster than the piston can travel, and the
explosive force litterally hammers the piston through to the crank,
with the crank berrins (all), wristpin, piston/rod taking all that overloading.
also the plug, valve seats & head bolts/gasket too. my dad, an engineer,
says rod to crank berrin takes the most abuse. and nobody i've asked has
yet seen a sparker blown out of a head.

i'd like 1200rpm at 85mph because i'm pretty much 85-100 on the highways,
and the dam thing is just too whiny still. a 6th gear would be nice too.
i been wearin earplugs on those half hour or more highway trips.

Yeah, I know about wind resistance. MPGs drop to the low thirties when I'm cruisin' down the Interstate. It's like trying to push a half-ton brick down the road.

I'm under no illusion that a 6-speed would ever be developed, hell, probably couldn't afford to swap it out anyway!! Just dreaming a little.

Now the 33 tooth pulley might be workable! I'll keep that one under advisement, Fireman!





BD

hey fire. what kind of noticable change in gas milage did ya get. and how much was a 33 tooth pulley.

donelam304 wrote:
hey fire. what kind of noticable change in gas milage did ya get. and how much was a 33 tooth pulley.
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I have a good comparison test for 32T vs 31T pulley i just ddi.

My friend has an 05 silverado with just pipes and i have an o6 silverado with just pipes too,both bikes had minimal carb tweaks but nothing major.

In the spring both bikes just had oil change/new plugs/new air filters/etc to motors were running efficiently

We just went on a 240 mile round trip both filling up at same time/same gas station at start of trip and also filled up fuel tanks using same pump durring the trip for consistancy on amount of fuel used,i did filling of both bikes for more cosistancy there too when doing the MPG test.

But the only difference is his bike has a 32T pulley and i installed a 31T piulley on my bike,his bike has windscreen in lower postion /less wind resiastance and my bikes windscreen is in upper postion = more wind reistance.

We cruised on open road at approx 70-72mph most of the time and he got dead on 43mpg and i got 43.4mph with the 1 tooth smalled pulley.

I feel that going to a 33T pulkley esp if you ride a lot 2up with bike fully loaded in hilly areas that copuld actually hurt/reduce fuel mileage.

Thats because the gearing in 5th gear with A 33T PULLEY will be so high/motor rpm a little lower that its not up as well into trq/HP range so you have to give it more throttle to retina conatct road speed and or climb hills using more fuel.

I found my fuel mileage didnt suffer at all going from 32t to 31t pulley but the 31t pulley really helped when i was riding 2up /bike fully lodaded/with headwind in mountains on interstate,didnt have to get into throttle as hard which was noticeable.

I also found the bike to be a little more spunky off the line and going thru the lower gears with 31t pulley which was to be expected ,also cruises very nicely in 5th gear at 55-60MPH which is a speed i am often at cruising out in the boonies on wk end day rides in the country & cruises just fine at 70mph/2,800rpm

But if you have a R* with no windscreen,not loaded with bags,dont ride 2up,live where its very flat and like to cruise at 75-80mph all the time thats where the 33t pulley could be benifical maybe getting you an additonal 1 or 2mpg since there will be a lot less load on the motor when riding 1 up = less weight vs riding 2up/no mountains to climb/no windscreen = less wind resistance/no bags or bags for less weight/etc.

Scott

25 mph in 3rd gear.