Looking at selling a bottom end assembly to a guy that has a 2000 Sporty. He says both sides of his assy. have the same part number on them, 23931-88. I have a bottom end assy. with two numbers, 23931-88 on the pinion side and 23935-88 on the drive side. I find it strange that there are different numbers.
I sent a email off to a respected forum sponsor vendor and got a very non-answer back on the number question.
"What services or products do you need from us" was their email answer. I didn't think I needed to be looking at giving them money to get, what for them is a simple answer to a simple question. Weird eh?
Soooo, can anyone with a part book handy look up the numbers for me??
Thanks, Ted

I think their reply was appropriate.

We have a ton of members here now. Do you really expect our supporting vendors to answer every question as a favor?

They give an awful lot of helpful advice, and are not in any way obligated to spend their own time looking up part numbers and such for us, although many times they do. Time is money, and they are running businesses.

Please take that into consideration.


Bart

Bart,
I did take that into consideration. I figure that I might need some work done down the road sometime. I will send that work to someone who will answer a simple question for me. Might have took about as long to check the numbers as it took to answer as they did. Minute or two maybe?
Another thing to consider is, I just about always have recomended them when someone asked about getting the type of work they do done on something.
Ted

Those are not part numbers, they are casting numbers. They don't correlate to HD part numbers.

Do you have a picture of them so we can try and ID them? What year motor did the flywheels come out of?

--Chris

The assembly I have is out of a 1989. The guy that needs it has a 2000. The numbers are confusing because of the -88 end on them. That is usually how a part number ends. I'm pretty sure the assembly from a 1989 fits a 2000, just want to make double sure.
Thanks, Ted

It does not fit. The '89 was a four speed, the 2000 is obviously a five speed. The sprocket shaft is different for the alternator, among other things. Pinion shaft is different too.

Additionally, 2000 got a whole new set of pressed together flywheels.

--Chris

Yeah .. 4 speed wheels have a different output from memory..... could be wrong tho as I havn't tried it...

I think I have a set of 4 speed wheels here somewhere, as well as 5 speed 3 piece and post 2000's ... I'll have a look at some numbers for ya

All 5 speed ones are interchangeable tho..... just gotta use the appropriate pinion gear for the cams you're using...


I put a set of '94 wheels in a 2000 the other day

didnt the pre 98 use not only a different pinion gear ,but also a different pinion shaft that was slotted for the gear rather than keyed?

OK... just had a look..


the part numbers on the wheels are casting part numbers....


the casting part number for both 5 speed wheels is the same as the right side of 4 speeds

BUT it's an A number which means an update of the origional number.... which in this case is a different machining of the same casting/forging...

4 speed and 5 speed aren't interchangeable...... different length outputs on the primary side...


Kerry ... not sure on the key/slot thing ... all the 5 speed sporties I can recall have been keyed and I just put a set of S&S Supreme rods on a set of 94 wheels and put 'em in a 2000 model with a post 2000 pinion gear and E grind cams.

Thanks guys. Looks like these won't work on the guy's 2000. The splined pinion was 86-87. Much stronger than the keyed pinion. S&S wheels come with a 87 type splined pinion shaft.
Ted

OK... just had a look..


the part numbers on the wheels are casting part numbers....


the casting part number for both 5 speed wheels is the same as the right side of 4 speeds

BUT it's an A number which means an update of the origional number.... which in this case is a different machining of the same casting/forging...

4 speed and 5 speed aren't interchangeable...... different length outputs on the primary side...


Kerry ... not sure on the key/slot thing ... all the 5 speed sporties I can recall have been keyed and I just put a set of S&S Supreme rods on a set of 94 wheels and put 'em in a 2000 model with a post 2000 pinion gear and E grind cams.

Just figuring this out now. the s&s flywheel set up is designed after the old pinion shaft I was told. I have broken the pinion shaft key and chewed up my redshift 643 cams in the process. Remeber that break i was tlking about that could be a problem this season. well it happened. So i have ordered the new wheels and shafts and rods from s&s and decided to get new cases from them to lessen the chance of future problems. I was shown a set of older wheels and the pinion and shaft were keyed to fit together ..not the single little iron key that my 02 was using but several meshing notches...looked way stronger.

Pics of pinion shafts. Splined is a 87, keyed is a 89. I have seen keys fail when used with agressive cams. That is why S&S uses the older splined shaft. On the lightweight S&S bottom in my motor I was able to use stock 87 pinion and oil pump gears. The motor co, in their infinate wisdom decided to make it weaker to save some $$$.
Ted

I am sorry you did not like my response but looking up part numbers is not a simple 1 or 2 minute deal.

You would not believe how many people expect me to give them free advice and recommendations only for them to turn around and buy the parts off of the internet.

I cannot compete on price with internet warehouses. The only thing I have is our knowledge and expertise to set us apart from them. If I give that away for free how do you expect us to stay in business?

If you had been an established customer I would have been more than happy to assist you.

Beauty pics...they say a thousand words. the meat of the keyed system had me shaking my head. That splined shaft looks good .

Dan,
I figured that with the expertice at NRHS the answer would be right at the tip of the tounge. 4 speed cranks dont work in 5 speeds due to the alternator change. I have raced and wrenched on 4 speed Sportys. I put the present motor together myself. I know 4 speeds, but not 5 speeds. I was looking at helping a guy out that need a flywheel assy. I was not going to sell the guy something that would not work. So, I went to the experts. Maybe we all learned something here. I can't imagine that you didn't know the answer though.
Ted

The guy is looking at S&S for a new crank now. Can't go wrong there. I suggested he look into the lightweight race wheels. I sure like mine. ;-)
Thanks again for all the help guys.
Ted