• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

oil pump gear mod

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

Guest
Hello all. I had my engine totally apart right after I first bought the bike about a year ago. I discovered that the original oil pump gears had been changed to ones that spun the oil pump faster, at a given rpm. Since I didn`t trust the fellow who owned the bike before me (he didn`t have a clue on maintenance) I went and replaced em with the stock gears. Sooo-my question is has anyone heard of this mod before, is it a Rube Goldberg idea or does it actually help things out in the lubrication department?
Thanks in advance.
 
Pumpin oil.....

Pumpin oil.....

45:
First off.....what do you have....which GS model, displacement?
My impressions of the GS line is that they all have just fine oiling systems...mind you MOST GS's have a low pressure oil-pump, far less pressure than most. (It has to do with the crankshaft bearings being of the roller type). It just doesn't make sense why anyone would want to modify this pump.
Rick.......
 
Let us assume that you have an 1100 or 1000 cc Suzuki . the oil pump gears that were fitted were probably from a 750 that does in fact help, it slightly raises oil pressure and increases oil volume around the motor and is a common mod done to these engines. If the previous owner was a bit suspect it is likely that this mod was done by a different previouys owner.
Dink
 
I have done this mod myself. If you have a 16-valve motor that is 1000cc or 1100cc you can install oil pump gears from a 16 valve 750 motor to increase oil flow. The pressure increase is almost non-existent. All the 16 valve motors share the same oil pump. Because the 750 motor requires a high pressure oil system to lubricate its' plain bearings, the oil pump is spun at a higher rate (thus the different gear ratio) than the 1000cc and 1100cc motors, which have ball bearings on the bottom end. Due to different gearing on the primary gears and secondary gears the overall increase in rpm of the oil pump with the 750 gears is only about 12% as I recall.

The idea is to increase flow to the top end where your cams ride directly in the head. This becomes critical if you start to install higher lift and duration cams. Another option is to install a top end lube kit, which allows an increase in oil flow to the cams. You have to install this kit when you are using aftermarket cylinder studs. Normally the oil flows to the top end via the space around the studs. If the new studs are larger in diameter, this will restrict your flow to the top end.


Hap
 
You can also use the 750 oil pump gears on a 2-valve GS1000. It pumps the oil round faster, & so the pressure increases slightly. It is mainly for increased oil flow to the top end - more important in a motor with high-lift cams etc - but still a very good mod for a standard bike.
Star Racing, Vance & Hines etc used to sell a kit which was a pair of gears which just happened to be the same as GSX750 gears!! Only they were a lot more money than a set of gears off a wrecked 750!
 
Paul said:
You can also use the 750 oil pump gears on a 2-valve GS1000. It pumps the oil round faster, & so the pressure increases slightly. It is mainly for increased oil flow to the top end - more important in a motor with high-lift cams etc - but still a very good mod for a standard bike.
Star Racing, Vance & Hines etc used to sell a kit which was a pair of gears which just happened to be the same as GSX750 gears!! Only they were a lot more money than a set of gears off a wrecked 750!
Click to expand...
I think I paid $40 from murdoch racing for rmy 750 oil pump mod.
 
I got a set from Vance and Hines years ago. No problems. '82 GS1100EZ
 
Mine came out of a wrecked '81 GS750...$20. These are getting harder to find!

Hap
 
oil pump gear mod

Wow, lots of great replies!. Sorry I didn`t elaborate on the bike.
Yes it`s an 1982 1100E, and the gears I were questioning are from the 750, thanks to the local dealer checking out the number of teeth on the gears for me. I appreciate you guys enlightening me. I`m going to have the clutch off of the thing soon, and I`ll be able to change the gears easy enough. If it makes the beast last longer, I`ll do it. That was my main concern. The reason I got the bike cheap and had to take the engine apart was due to the oil pump seizing, the gear coming off the pump shaft and chewing up the gear and the clutch basket and then the engine running dry long enough to waste the cams and the head. Definitely an expensive experience. But worth it because the engine is fresh now and these bikes have a high fun factor built into them.
 
Re: oil pump gear mod

45%tilt said:
Wow, lots of great replies!. Sorry I didn`t elaborate on the bike.
Yes it`s an 1982 1100E, and the gears I were questioning are from the 750, thanks to the local dealer checking out the number of teeth on the gears for me. I appreciate you guys enlightening me. I`m going to have the clutch off of the thing soon, and I`ll be able to change the gears easy enough. If it makes the beast last longer, I`ll do it. That was my main concern. The reason I got the bike cheap and had to take the engine apart was due to the oil pump seizing, the gear coming off the pump shaft and chewing up the gear and the clutch basket and then the engine running dry long enough to waste the cams and the head. Definitely an expensive experience. But worth it because the engine is fresh now and these bikes have a high fun factor built into them.
Click to expand...
You are just tasting the icing on the cake with that 1100cc thing.
 
Mods...mods.....

Mods...mods.....

Hap Call said:
I have done this mod myself. If you have a 16-valve motor that is 1000cc or 1100cc you can install oil pump gears from a 16 valve 750 motor to increase oil flow. The pressure increase is almost non-existent. All the 16 valve motors share the same oil pump. Because the 750 motor requires a high pressure oil system to lubricate its' plain bearings, the oil pump is spun at a higher rate (thus the different gear ratio) than the 1000cc and 1100cc motors, which have ball bearings on the bottom end. Due to different gearing on the primary gears and secondary gears the overall increase in rpm of the oil pump with the 750 gears is only about 12% as I recall.

The idea is to increase flow to the top end where your cams ride directly in the head. This becomes critical if you start to install higher lift and duration cams. Another option is to install a top end lube kit, which allows an increase in oil flow to the cams. You have to install this kit when you are using aftermarket cylinder studs. Normally the oil flows to the top end via the space around the studs. If the new studs are larger in diameter, this will restrict your flow to the top end.
Gadzooks!!.........learn something new everyday!!
Rick......


Hap
Click to expand...
 
You must log in or register to reply here.
Back
Top