Lower cruising R's

[QuarterHorse]

I've done some research and I'm really wanting to lower the cruising RPM on the Max. I've seen that RMS can re-do the diff on the bikes, that lowers the cruising R's @ 80mph from 5G's to 4G's which is considerable. It doesn't seem too spendy I suppose at $400.00 exhange, but was wondering what other options I have. I plan on getting forward controls, shaving the seat, ignition, and getting this done over the winter, and was curious on your thoughts.

 

[one2dmax]

The venture diff will only change your rpm by 10% over what you are now. At 5000 your new rpm will be 4500. at 4000 it will be 3600 and so on. I lost .3 in the quarter mile with it so it does affect acceleration but most will not notice or mind.

Fuel economy can gain by that same 10% though most will not see that much.

I do make an overdrive using Royal Star components which drops 5th gear rpms by closer to 25% but requires engine removal and transmission modification. It's a $300 upgrade to my normal trans service. The upside is same acceleration in 1st -4th gears (120mph) and cruising in 5th. RPM at 60mph is 3000, 80mph is 4000, and even 100mph is only 5000!

If your engine is in good condition and not considering a bore kit then the venture diff is the way to go.

Sean Morley

 

[QuarterHorse]

The venture diff will only change your rpm by 10% over what you are now. At 5000 your new rpm will be 4500. at 4000 it will be 3600 and so on. I lost .3 in the quarter mile with it so it does affect acceleration but most will not notice or mind.

Fuel economy can gain by that same 10% though most will not see that much.

I do make an overdrive using Royal Star components which drops 5th gear rpms by closer to 25% but requires engine removal and transmission modification. It's a $300 upgrade to my normal trans service. The upside is same acceleration in 1st -4th gears (120mph) and cruising in 5th. RPM at 60mph is 3000, 80mph is 4000, and even 100mph is only 5000!

If your engine is in good condition and not considering a bore kit then the venture diff is the way to go.

Sean Morley

Thanks for the info Sean! Yeah I really didn't want to get in the trans, as before I bought the bike it had been gone through and had back cut gears etc installed. The motor runs strong and I don't plan on doing anything with it for a few years, maybe a set of cams etc, but that's down the road.
I had thought about the diff conversion and a set of 18" wheels to lower 'er down, any little bit helps, and it's more for piece of mind turning lower R's rather than fuel mileage.

 

[4gasem]

I got 40mpg the other day with my lighter wheels and 18's.

The last time I checked it it was 31mpg but the motor is still breaking in with only 2000 on it so far... :whistlin:

 

[QuarterHorse]

I did a cruise with a bunch of H-D guys for a benefit ride a month ago, and even with the stock geared and Stage 7 carbs, I got right at 40 mpg that ride. I couldn't believe it! Normally it's around 30-32, 'cause I can't stay out of it.

I'm not even wanting the better fuel mileage, I just want a lower cruising RPM honestly.

 

[bikedave99]

So, does anyone know what year Ventures will work on the pumpkin change?

 

[maxcruiser]

So, does anyone know what year Ventures will work on the pumpkin change?

86 - 93 venture diff is a direct swap - just need to install the shock bolt.

I did the swap awhile back on my 96 max and since put this diff on my 06 max - wanted to reduce rpm's on the highway (where I spend most of my time) A relatively easy job to do and not expensive - the bike is now less "buzzy" on the highway.

Mike

 

[bikedave99]

Thanks for the quick response, so are the older ones not direct or is the gear ratio different?

 

[maxcruiser]

Thanks for the quick response, so are the older ones not direct or is the gear ratio different?

The older ones don't fit at all. The following is a list that I took from another forum:


[FONT=verdana, arial, helvetica]YAMAHA FINAL (SHAFT) DRIVES[/FONT]

[FONT=verdana, arial, helvetica]FINAL DRIVES.......YEAR/MODEL........................RING/PINION.....NOTES [/FONT]
[FONT=verdana, arial, helvetica]5JW-W4612-00-00....03-05 FJR1300.....................33/9, 3.667.....2,6,8[/FONT]
[FONT=verdana, arial, helvetica]3P6-W4612-01-00....06-up FJR1300.....................33/9, 3.667.....2,6,8[/FONT]
[FONT=verdana, arial, helvetica]1FK-46101-01-00....85-95 VMX1200 V-Max...............33/9, 3.667.....2,5,9[/FONT]
[FONT=verdana, arial, helvetica]1FK-46101-02-00....96-97 VMX1200 V-Max...............33/9, 3.667.....2,5,9[/FONT]
[FONT=verdana, arial, helvetica]1FK-46101-10-00....98-up VMX1200 V-Max...............33/9, 3.667.....2,5,9[/FONT]
[FONT=verdana, arial, helvetica]4R0-46101-00-00....82 XJ1100......................33/10, 3.3......1,4,7[/FONT]
[FONT=verdana, arial, helvetica]4H7-46101-00-00....80-81 XJ650.......................32/11, 2.909....3,5,9[/FONT]
[FONT=verdana, arial, helvetica]5G2-46101-00-00....82-83 XJ650.......................32/11, 2.909....3,5,9[/FONT]
[FONT=verdana, arial, helvetica]5G2-46101-01-00....85-86 XJ700 Maxim.................32/11, 2.909....3,5,9[/FONT]
[FONT=verdana, arial, helvetica]5G2-46101-00-00....81-83 XJ750.......................32/11, 2.909....3,5,9[/FONT]
[FONT=verdana, arial, helvetica]31A-46101-00-00....83 XJ900.......................32/11, 2.909....3,5,9[/FONT]
[FONT=verdana, arial, helvetica]2H7-46101-00-00....78-80 XS1100......................33/10, 3.3......1,4,7[/FONT]
[FONT=verdana, arial, helvetica]4R0-46101-00-00....81 XS1100......................33/10, 3.3......1,4,7[/FONT]
[FONT=verdana, arial, helvetica]1J7-46101-N0-00....77-79 XS750.......................32/11, 2.909....2,4,8[/FONT]
[FONT=verdana, arial, helvetica]3J2-46101-N0-00....80 XS850.......................32/11, 2.909....2,4,9[/FONT]
[FONT=verdana, arial, helvetica]4R2-46101-N0-00....81 XS850.......................32/11, 2.909....2,4,9[/FONT]
[FONT=verdana, arial, helvetica]5G2-46101-01-00....84-85 XV1000 Virago 1000..........32/11, 2.909....3,5,9[/FONT]
[FONT=verdana, arial, helvetica]56W-46101-02-00....84-85 XV1000 Virago 1000..........32/11, 2.909....3,5,9[/FONT]
[FONT=verdana, arial, helvetica]56W-46101-02-00....86-99 XV1100 Virago 1100..........32/11, 2.909....3,5,9[/FONT]
[FONT=verdana, arial, helvetica]2NT-46101-00-00....87-88 XV535 Virago 535............32/11, 2.909....A[/FONT]
[FONT=verdana, arial, helvetica]2NT-46101-00-00....90 XV535 Virago 535............32/11, 2.909....A[/FONT]
[FONT=verdana, arial, helvetica]2NT-46101-00-00....93-00 XV535 Virago 535............32/11, 2.909....A[/FONT]
[FONT=verdana, arial, helvetica]5G2-46101-01-00....84-85 XV700 Virago 700............32/11, 2.909....3,5,9[/FONT]
[FONT=verdana, arial, helvetica]5G2-46101-01-00....88-97 XV750 Virago 750............32/11, 2.909....3,5,9[/FONT]
[FONT=verdana, arial, helvetica]5EL-46101-00-00....99-up XVS1100 V Star 1100.........32/11, 2.909....3,6,9[/FONT]
[FONT=verdana, arial, helvetica]5FB-Y4617-00-00....98-up XVS650 V Star 650...........32/11, 2.909....A[/FONT]
[FONT=verdana, arial, helvetica]26H-46101-01-00....83-85 XVZ1200 Venture (Royale)....33/10, 3.3......1,4,7[/FONT]
[FONT=verdana, arial, helvetica]1NL-46101-00-00....86-93 XVZ1300 Venture (Royale)....33/10, 3.3......2,5,9[/FONT]
[FONT=verdana, arial, helvetica]4NK-46101-00-00....96-97 XVZ1300 Royal Star..........33/10, 3.3......2,6,9[/FONT]
[FONT=verdana, arial, helvetica]4YE-46101-00-00....98-00 XVZ1300 Royal Star..........33/10, 3.3......2,6,9[/FONT]
[FONT=verdana, arial, helvetica]4XY-46101-00-00....01-up XVZ1300 Royal Star..........33/10, 3.3......2,6,9[/FONT]


[FONT=verdana, arial, helvetica]Notes:[/FONT]
[FONT=verdana, arial, helvetica]1. fully splined pinion coupler[/FONT]
[FONT=verdana, arial, helvetica]2. recessed splines on pinion coupler, drive shaft spacer required[/FONT]
[FONT=verdana, arial, helvetica]3. unknown if pinion coupler is fully splined (recessed splines probable)[/FONT]
[FONT=verdana, arial, helvetica]4. final drive shock mount[/FONT]
[FONT=verdana, arial, helvetica]5. final drive shock mount relocation or R1 mono shock required[/FONT]
[FONT=verdana, arial, helvetica]6. no final drive shock mount, R1 mono shock mod recommended[/FONT]
[FONT=verdana, arial, helvetica]7. no pinion coupler oil passages[/FONT]
[FONT=verdana, arial, helvetica]8. pinion coupler oil passages, RTV and washer required[/FONT]
[FONT=verdana, arial, helvetica]9. unknown if pinion coupler oil passages exist (oil passages probable)[/FONT]
[FONT=verdana, arial, helvetica]A. final drive pinion coupler not compatible with XS1100 drive shaft[/FONT]

 

[Robbarrie]

So let me get this right. Mine being a 93 has a note of 2,5,9 so if I get the one from a Venture that notes the same 2,5,9 then it is a direct swap...? Correct.

I too would like to lower it allot more but if the reduction is just 500rpm it's better than nothing because I don't know anybody that could do what Sean does.

 

[113s&s]

I've done some research and I'm really wanting to lower the cruising RPM on the Max. I've seen that RMS can re-do the diff on the bikes, that lowers the cruising R's @ 80mph from 5G's to 4G's which is considerable. It doesn't seem too spendy I suppose at $400.00 exhange, but was wondering what other options I have. I plan on getting forward controls, shaving the seat, ignition, and getting this done over the winter, and was curious on your thoughts.

id would think decking the head for more compresion the changing gear for a lower rpm..would cause ping knock ect....not a good combo

 

[one2dmax]

It's hard to get these engines to detonate. You can run crappy gas, high compression, and still not have many problems.

We deck the block on some of our engines to gain compression without buying custom pistons. Hard to find a shop that can do that too.

Sean Morley

 

[113s&s]

It's hard to get these engines to detonate. You can run crappy gas, high compression, and still not have many problems.

We deck the block on some of our engines to gain compression without buying custom pistons. Hard to find a shop that can do that too.

Sean Morley

i know with the harleys a jump in compression was the biggest bang for the buck....im sure all motors are the same as far as trade off..with higher compression is there starting starter issues..battery issues..wear and tear on lower end

 

[one2dmax]

The starters (90 and up) have no real problems turning over 14:1 1500 engines.

Sean

 

[KJShover]

oops, posted about the two Venture diffs on ebay but they are too old.

 

[QuarterHorse]

Yeah I'm a little tapped for money as far as anything more than $100.00 at a time for the 'Max this year. I guess the Dyna ignition and Venture diff will have to wait. Although I really want to stretch the Max next winter, I'll have to do the diff then.

 

[RagingMain]

I did the swap and for someone who commutes as much as I do it was the number one best thing I have done to the bike so far.

Yes it is a direct swap. Had to drill and tap the hole for the shock mounting bolt.

You will lose some acceleration but gain mileage and much less of a buzz at highway speeds.

 

[MBreinin]

I wish the V-Max was wrapped up tight and done at about 120. I would like a gearset that was designed for maximum acceleration with a deep 5th for cruising. I have no need for the V-Max's 150 mph top speed and I rarely see triple digits on mine.

Mike

 

[one2dmax]

i've already developed that. Look up Royal Star fith gear upgrade.

Sean