SX/SXi/SXi Pro Big pin, little pin 750 sxi questions

[Big Kahuna]

Hey that's a stock class secret. shh. shh, shh:sneaky:

That is something that Bill Haig is always saying........ If it is perfectly flat you dont need a gasket!!!!!!!!!!!!!

 

[djkorn1]

I did too. A 94 flywheel did NOT fit on my 98. The crank is different and has a different taper.

The 750 flywheel's are all the same from 93 & up. I know I've tried them.
All 750 stator's will work with 03 and under cdi's. I know I've tried them.

 

[Crab]

I must have the early crank, the PTO and flywheel fit off my 650.

 

[ski_crazy]

Thanks for the help, I think or the confusion I'm still not sure:veryhappy:

Zig my motor is teal green. It does have 12 bolt holes but only 10 have studs with nuts. The other two holes are on the side of the intake hanging off the side with nothing to bolt to.

 

[WFO Speedracer]

I am pretty dang sure all green engines are big pin.:biggthumpup:

 

[john zigler]

I am pretty dang sure all green engines are big pin.:biggthumpup:

yup. sounds like someone just removed some of your studs. if it is the light, teal green, it is a 96-newer motor, and will be a big pin.

 

[djkorn1]

Yep...big pin. Somebody took the studs out to mount the old school Intake. :sad6:

Thanks for the help, I think or the confusion I'm still not sure:veryhappy:

Zig my motor is teal green. It does have 12 bolt holes but only 10 have studs with nuts. The other two holes are on the side of the intake hanging off the side with nothing to bolt to.

 

[ski_crazy]

Here is a couple pics of the intake and the open holes. What gives?

 

[john zigler]

i have no idea what the heck kind of intake that is. i have never seen one hang over the side of the block like that. lokks like it was ment for some kind of extra mount bracket for something.

 

[Crab]

Not a Kawi manifold?

 

[ski_crazy]

Its an R&D manifold. It works and its pretty being polished. That polished has to add at least 3-5 hp, huh.

 

[ADDict]

How can I tell which engine I have? It's a silver case small pin engine with the 10 hole intake pattern. And it needs a lot more work than I thought, but thats another story.

 

[Crab]

How can I tell which engine I have? It's a silver case small pin engine with the 10 hole intake pattern. And it needs a lot more work than I thought, but thats another story.

Explain?

 

[sflsurfrider]

those 2 holes could be for external fuel pump mounting..... if youre in to that sort of thing.

 

[tmetz]

thanks for clarifying the differenced in pin motor's. I have two of them sitting on my uncles garage floor. And i was so confused trying to figure out big pin or small pin... I think i have it under control now... lol

 

[dbrutherford]

those 2 holes could be for external fuel pump mounting..... if youre in to that sort of thing.

I used ot have an R&D intake manifold just like that. The extra bolt holes are exactly what Charlie said they are for.

The newer 800 SXR R&D intake manifolds have a plate that bolts down to the carbs. Then this plate and carbs bolt down to the intake manifold. I believe they sell one just like this for Yamahas too. This way there is an o-ring between the plate and manifold. You seal the plate to the carbs with a couple of Mikuni SBN 44 green gaskets. This lets you remove the carbs for jetting changes without the having to reuse or replace the green gaskets.

You have a big pin engine. To use that intake manifold, they removed the two inner studs. If you compare cases for big and small pin, there is not even a place in th casting where the two inner studs would be, on a small pin case. Big pin is only the set of cases that have them.

When I built my 92 750 SS engine and had the "unrebuildable" crank due to the crazy rod size, I just bought a new 94 750 SS crank from my dealer. I used a 650 style flywheel on it no problems. I have a spare 750 flywheel I believe came off a big pin crank and a spare 650 flywheel, I will have to compare the two.

 

[ski_crazy]

Thanks for all the insight guys.

 

[Waternut]

If you compare cases for big and small pin, there is not even a place in th casting where the two inner studs would be, on a small pin case. Big pin is only the set of cases that have them.

Is this definate? I always thought I had a small pin in my 92 but mine has the inner holes for the intake manifold. I don't use them but the casing certainly has the holes.

 

[dbrutherford]

I would have to dig up some pictures of my old 750 engine, it was a small pin for sure since it came from a 92 750 SS. I am pretty certain that there isn't even any material on the small pin cases for the two inner holes.

Liek i said before the big pins have these two holes even if they are not using them. Some manifolds as mentioned before will not use these two studs and they have to be removed for the manifold to fit.

That is why this is the definitive answer if a set of cases are big pin or small pin.

 

[john zigler]

Is this definate? I always thought I had a small pin in my 92 but mine has the inner holes for the intake manifold. I don't use them but the casing certainly has the holes.

this really can be hard.....

all big pin motors have 12 bolt intakes. not all small pind have 10 though..
only the single carb motors have the 10 bolt cases.

for instance, the 93 SSXi was a small pin 750 dual carb motor, and that has 12 intake bolts.

then how about the 95 750SXi? i always thought that was a big ppin motor, but after looking up crank shafts, i now think it is a small pin. this too has dual carbs, and a 12 bolt intake. thus 96 was the 1st big pin.


zig