| Author | Message | ||
     Fuzzz |
Does anyone know when Tubers started using the "momentum reduction" pressed together flywheels? I know the 00 Cyclone has them, and the 98 S1, but not sure of earlier examples. | ||
| Phelan |
A '98 S1 does not have them. A '98 S1W does, as well as a '98-up S3T. A '98 S3 does not have them, nor a '98 M2. BTW 98-99 reduced weight flywheels were 3-piece cranks, while '00-'02 had pressed cranks. | ||
| Phelan |
Oh and all the '00-'02 tubers had the pressed reduced weight flywheels. So to directly answer your question, '00-'02 had pressed together cranks, while '98 S1Ws and S3Ts had a 3 piece version of the reduced weight flywheels/cranks | ||
| Fuzzz |
Thanks! My oldest son just bought a 97 S1, and after the test ride I was sure it didn't have them. I like the way the newer tubers feel, perhaps I can find a set of wheels for future use for him. | ||
| Foximus |
how much lighter are the newer ones, than the 97 s1? | ||
| Phelan |
~2 lbs. | ||
| Foximus |
WhaaT?! really? Thats a massive difference! a 98 tuber and up has a flywheel thats around 2lbs lighter than a 97??? Where do i find one? Jez... | ||
| Phelan |
Somebody in another forum calles me out on The flywheel information, so I'm trying to find some definitive data. They said that '96-'99 Buells except '96 S2 all used the same light flywheels and included a P/N. I have yet to verify right or wrong on that, but it is possible I have been repeating misinformation for the past two years on this subject, so I'll try to get to the bottom of it. | ||
| Buellistic |
The two pounds lighter flywheels made the engine rev up quicker and the 27 tooth counter shaft sprocket added a little to the up-date package ... The light flywheels is a cheaper up-date(they have to be balanced any way) to do as is the 27 tooth counter shaft sprocket(plenty of them available) ... | ||
| Court |
All S1 and S1W's appear, looking at the parts manuals to have the same (23899-96Y) flywheels. The 1995 and 1996 S2 were the only Buells with the heavier (23990-90Y) flywheels. | ||
| Court |
>>>The two pounds lighter flywheels They were THREE (not two) pounds lighter and appeared for the first time on the 1996 S1 Lightning. Essentially . . the ONLY Buell to ever have "heavy" flywheels were the 1995 and 1996 S2 and S2T models. (Message edited by court on October 17, 2010) | ||
| Buellistic |
The 2000 Models went to a STRAIGHT PIN flywheels ... The ROTATIONAL INERTIA of the flywheels were reduced 14%(LIGHTER FLYWHEELS)to ENHANCE ACCELERATION(racing hint) ... This required a NEW RIGHT CRANK CASE HALF with NEW OIL PASSAGES and NEW CAM GEAR COVER with new oil passage ways(you can IMPROVISE and put them in earlier case's) ... The intent was to maintain a more constant between the oil filter and the NEW LIFTERS "RE-TRO FITTED out of the Twin Can 88 Motor ... An interesting aspect of the NEW LIFTERS is to restrict oil flow to the top end too much oil in the top end caused heat buildup(race hint)... | ||
| Fuzzz |
Oh man, just when I thought things were clearing up, I found this note in my '99-'00 M2 service manual..." All 2000 Model year Buell Thunderstorm engines have a NEW straight, pressed-in crankpin and low inertia flywheel. The new flywheel is serviced as an assembly (is not disassembled)" The photos of the '99 model crankpin and flywheel are definitely bolt-together "heavy wheels...and the 98 S1 manual I have also shows the heavy wheels, whereas the '01 S3/S3T manual on my shelf describes only the "light" wheels, with the added note..."If the flywheel or connecting rods need to be replaced, then they must be replaced together as one assembly. Return the flywheel/connecting rod assembly to the factory for replacement."....So I guess all we know is some have and some don't! | ||
| Foximus |
so basically nobody agrees? LoL. | ||
| Foximus |
Ah... well in that case feel free to send me some heads and new pistons. ;] | ||
| Snowbees |
My 99 X1 has a straight crank pin (pressed together), i had a new one made along with new big end bearings. | ||
| Jespo_m2 |
That's it.... everyone... start tearing down your motors and reporting which crank you have. We need to make sure.  | ||
| Kyrocket |
Already have. Mine ('99 X1) was pressed. Crank pin got chewed up. Tearing it down again for similar symptoms. | ||
| Oldog |
 err you just did that? new crank? | ||
| Rick_a |
For your viewing pleasure: Old VS New(er)       The new flywheel is only about 1lb lighter than the old lighter flywheel, but as can be seen the way the weight is distributed is very different. Some crankcase machining needs to be done when converting from the older to newer style. | ||
| Fuzzz |
Rick, ya beat me to it, tho I don't have any pics of the "old" wheels... Picked this set up from Frederick's as a spare... Part # 23899-00YA, weight 20 lbs    | ||
| Buellistic |
"WOW", LESS OIL DRAG AND "LIGHTER" !!! | ||
| Fuzzz |
I noticed the wheels were dry when I saw the pics I posted, and found a cool way to prelube the lower end bearings. I have a mini funnel that fits on the end of an oil jug, and it threaded on the pinion shaft, turn it sideways and the oil just flowed in till it oozed out between the wheels, spread the excess all over the set and put them back in the box for future reference... |
