Anyone recognize this Master Cylinder?

[D.Harrison]

Master cylinder

Master cylinder

I have the same master cylinder on my 1982 GS750T. I got a rebuild kit on ebay motors for a good price. Sorry ,I don't have the part number of the master cylinder.

 

[Commodus]

Thanks for the information... Were you able to tell by the resevoir? That seems the be the only discernable way to tell the various years apart

Yes, the Asco MC is quite distinctive from the other types.

 

[Commodus]

Hrmm.... rats. Looks like I still can't place this MC then since it looks different from chef's, but the part I got from Bike Bandit matches the one chef has. OK Earl, thank you so much for the offer. Looks like I may have to try and pick up one from an E model or something.

Bill, does JG know the origin of any of the MCs in his parts bin?

Hrm? The parts numbers I quoted will get you the right parts. If you wish to doublecheck them, just go to any site with an online fiche. Look for any one of the models I quoted (and apparently some L and T models, regrettably my cross-referencing software seems to have failed me in this case) and the fiche will show you your MC, I am sure.

 

[Tom MLC]

I saw a master cylinder like that on Rob's '80 GS850L. That funky angle looked weird. Like it was bent or something. Nothing like the one on my '80 GS1100E. It has the square type.

Anyway, it you want to contact Rob, his handle is RobGS850L. (duh)

 

[Guest]

Not a whole lot..................
airbox
front and rear calipers and rotors
front and rear rims (axles maybe)
Battery box
Misc small brackets
possibly footpegs (would have to search LOL)
Engine complete minus carbs and starter.
Probably handle bar caps

Thats all I can think of at the moment. If you need something, I can Look and see if I have it.

Earl

You have a complete 16 valve 1100 motor just sitting around? The shame!

JC
I'd take Earl on his offer for his M/C. The piston cup set isn't that expensive and I've seen it on Ebay lately. I might even have a decent cup set in by bucket of goodies (coffee can)

 

[J_C]

I definitely appreciate the offer, don't get me wrong... but if the MC he has is the same as the one I have now then the resevoir I got from bikebandit and the cup and piston set etc wont fit... I still won't be able to order off the fiche. I need to get a model that had your MC (the one I attached in my last post).

 

[earlfor]

You have a complete 16 valve 1100 motor just sitting around? The shame!

I've kinda been saving it to use when I get to doing the mods and upgrades on the 450.

E.

 

[earlfor]

I definitely appreciate the offer, don't get me wrong... but if the MC he has is the same as the one I have now then the resevoir I got from bikebandit and the cup and piston set etc wont fit... I still won't be able to order off the fiche. I need to get a model that had your MC (the one I attached in my last post).

I have no way of being sure the master cylinder assembly from my parts bike is original. It may or may not be correct.

E.

 

[GS750]

Well my best suggestion (having recently ordered a kit for my GS750B and getting WRONG parts) is to strip it down first, its easy really, it is definately a NISSIN master cylinder and they only came in 2 main sizes (in that style)

Measure the outside of the rubber cup and then you will have 2 choices:

If its a 14mm just order Suzuki genuine part number 59600-45821 to suit any of the following:

Part Description = CUP SET,MASTER CYLINDER
Model Count = 36
GN400LT 1980
GN400TX 1981
GS250TT 1980
GS250TX 1981
GS400B 1977
GS400C 1978
GS425LN 1979
GS425N 1979
GS450LT 1980
GS450LX 1981
GS450TX 1981
GS650GLX 1981
GS750B 1977
GS750C 1978
GS750N 1979
GT185A 1976
GT185B 1977
GT185L 1974
GT185M 1975
GT250-B 1977
GT250A 1976
GT250K 1973
GT250L 1974
GT250M 1975
GT380-B 1977
GT380A 1976
GT380K 1973
GT380L 1974
GT380M 1975
GT500A 1976
GT500B 1977
GT550-B 1977
GT550A 1976
GT550K 1973
GT550L 1974
GT550M 1975



16MM (most twin discs)

If its a 16mm just order Suzuki genuine part number 59600-45811 to suit any of the following:

Part Description = CUP SET,MASTER CYLINDER
Model Count = 17
GS1000GLX 1981
GS750EC 1978
GS750EN 1979
GS750LN 1979
GS750LT 1980
GS750LX 1981
GS850GLT 1980
GS850GLX 1981
GS850GN 1979
GT750-B 1977
GT750A 1976
GT750K 1973
GT750L 1974
GT750M 1975
RE5A 1976
RE5M 1975
X4571T UK

 

[GS750]

I believe that is an Asco master cylinder. Suzuki started using them when they phased out the Nissin hardware that the GTs used; in 1977 with the introduction of the GS750. It was used on several models, GTs and GSs:.

Erm, im all of my 4 genuine suzuki parts manuals (77, 78, 79, 80) they show the master cyl with the tapered end (as in the original picture) as being the NISSIN, and the one with the cut off square snub nose as being the ASCO, corect me if Im wrong but I really dont think suzuki dealer manuals would have the wrong part description in 4 years worth of manuals, and I just ordered parts for my NISSIN (as in the picture) and my local suzuki dealer ordered on the phone whilst I was standing there, he stated "TO SUIT THE NISSIN MASTER CYL".

 

[jonr]

I've seen that master cylinder on Jimcor's 82? GS550L. I was intrigued when I saw it and inspected it further. The reservoir is angled because of the big sweep in the handle bars on L models. The cap should be level when mounted properly. Here it is on Alpha-sports.

Aside from the angled reservoir, the lid and the inside of the base looks identical to my 78 GS750E. I would bet that the mc is nearly identical sans the reservoir.

-J

 

[J_C]

This thread has my head spinning now I'm going to review this again tonight when I get home and measure the opening. Thanks folks!

 

[GS750]

JC, the opening is NOT the same size as the piston area.

It is larger at the start by several milimeters, the only way to check the cup size is to strip it out.

It would take you at most, 2-3 days from the likes of bikebandit to have the part once you have stripped it out, it takes only a set of circlip pliers to remove the piston and some rag to absorb the brake fluid.

Also ensure you use some automotive rubber grease that is suited brake fluid when you reassemble it, also check for scores in the bore of the master, and if necessary have it honed to remove the scoring.

 

[Commodus]

Erm, im all of my 4 genuine suzuki parts manuals (77, 78, 79, 80) they show the master cyl with the tapered end (as in the original picture) as being the NISSIN, and the one with the cut off square snub nose as being the ASCO, corect me if Im wrong but I really dont think suzuki dealer manuals would have the wrong part description in 4 years worth of manuals, and I just ordered parts for my NISSIN (as in the picture) and my local suzuki dealer ordered on the phone whilst I was standing there, he stated "TO SUIT THE NISSIN MASTER CYL".

Hmm, I suppose it's possible that I am incorrect, but in all of my Suzuki literature it clearly lists the pictured M/C as an Asco - calipers, too. I know that Suzuki certainly did go back to Nissin stuff after this, however. An easy way to tell is look at the markings on the equipment, Nissin stuff will (usually) say Nissin on it somewhere, and the Asco stuff will be branded with the Suzuki S.

But, I would suppose the factory manuals would be correct.

In any rate, all of this is mostly irrelevant, the parts numbers I listed will certainly get you the OP the parts he needs - he needs only go to any online fiche to verify that.

 

[J_C]

Well the problem I'm having is that they all LOOK the same. The only way I can seem to tell them apart is that the resevoir that exists for my model doesn't match the resevoir that is currently on the bike. The screw patterns are different, the resevoir diameter is different... And I'm now learning that the resevoir is bent to accomodate the swept back handlebars, which means I need to stick with the type I have now instead of the L.

I think that the easiest way would be to get a dual disc L type MC from a known source so that I know for sure exactly what model it's from. The only other way I can see is for someone to positively identify the pattern of the bottom of the resevoir as mentioned before.

 

[Matt]

master cylinder

master cylinder

Hi I've just rebuilt my master cylinder, 1981 Gs850Lx.
It looks to be identical.
Hope this helps.
Cheers
Matt

 

[J_C]

It helps a ton! The resevoir bottoms and screw patterns appeared to be the same?

Thanks!

 

[J_C]

Just for the record, that was in fact the MC from the '81 850L. It's also the same part number as a bunch of the L models from 80 through 82 I believe. For some reason the 1980 1100L used the same one as those from the late 70s, while the 850 and 1000 used the newer part number.

Thanks again to everyone!