97 VMAX XTC 600 oil pump help

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mx862

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I just purchased a 1997 Yamaha VMAX XTC 600 and doing a little research I see that the oil pumps are notorious for failing. I have no history on this sled to know if the pump has already been changed or if it even really has a problem. Can anyone tell me how I may be able to tell if this may have been changed or are the 98 and up 600 pumps interchangable? My local Yamaha dealer was not much help. I would like to install a good used pump for peice of mind before I load up and travel 400 miles with it. Also if anyone has a good jetting setup as I am about to pull the carbs and give them a cleaning. I will be riding in Northern Michigan and the U.P. if that helps. Thanks for your help!
 

you will know if the pump is going bad because you will start using more oil. when the pump on these goes they use more oil, better then burning it down. just make sure the oil pump is set correctly before you ride it. the cable setting should be between 20-22mm. as for different years running the same pump, just check the microfiche of different year sleds. part #'s should be the same. i use ronnie's microfiche that is on line.
 
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I know I have a pretty lengthy oil pump thread in the past couple of years. Mine was bad on my venture. It drank oil, and fouled plugs.
 
I just went through the sled last night pulled carbs to clean and with the carbs out of the way I can see 8CR2 stamped on the pump lever. I dont know if that is enough info to tell what pump I have. I noticed that the newer model pumps have 3 lines instead of 2 which will change the part number but I was wondering if the pump internals may be the same and the 3rd line is maybe a drain for the bleed? It seems to run fine but its hard to tell in the shop maybe we will get some snow here so I can test her out before heading north.
 
mx862 said:
I just went through the sled last night pulled carbs to clean and with the carbs out of the way I can see 8CR2 stamped on the pump lever. I dont know if that is enough info to tell what pump I have. I noticed that the newer model pumps have 3 lines instead of 2 which will change the part number but I was wondering if the pump internals may be the same and the 3rd line is maybe a drain for the bleed? It seems to run fine but its hard to tell in the shop maybe we will get some snow here so I can test her out before heading north.
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Here is the info you need. unfortunately you need much more info than the first few digits.

8CR-13100-01-00 (replaces 8CR-13100-00-00)

the first one listed is the revised updated pump, and the "replaces " one is the original one. IMHO, Yamaha should have replaced these free under warranty, but they did not.

like was said before, they fail rich when they fail, so if yours uses a half an oil tank worth of oil for 1 tank of gas, it's definitely needing replacement. Mine did not start out as rich as that, but it got worse oil usage as the miles piled up. It has 8k on it now, and only like half that when we got it a few years ago.
 
sounds like very little risk in waiting til the pump actually needs replacement...now that your aware of the symptom why not let it expire first?
 
Keep in mind that the shaft that is driven by the belt off the mag wears down and these pumps can fail that way, ie - not pumping anything, happened to me and that is no fun. It should be square at the end, you will know if it's bad by pulling it off and looking at it.
 
^^^^ exactly! especially the 97-98 twins. i would more describe the end of the pumpshaft as an elongated diamond. its actually driven by the water pump impellor shaft.

not to ruin your warm fuzzy feeling thinking that if that pump fails it goes wide open. when that shaft fails(and it will) you pump absolutely no oil. 2- 4mm allen heads hold it in place, i would be for inspecting it if your approaching or over 5000 miles.

sorry to burst your oil bubble, but its a cold hard fact on those models. should be several threads on the subject.
 
I will try to find a good used pump for if nothing else piece of mind. The sled is for my wife and will be her first experience with sledding so I would like to avoid any problems seeing that it is a 4-7 hour drive to the trails. Sounds like worst case it chuggs oil and maybe fouls plugs. I will look for a pump with the proper part number as I am uncertain that a later model pump with a different part number would work. I will inspect that shaft as well the sled is in good shape with 3700 miles so hopefully all is well.
 
While the shaft can wear out, that's less likely than the pump just failing rich. Even with around 6k on the original pump when I changed it, the shaft was fine on mine. If you find a newer design pump, by all means swap it out as the original ones were simply a bad design.
 
I'm freaked about recoil starters so I bought a nice used one from a ER parts sled..keep it in the SX700 cargo bay ...for if/when needed..can always resell on e.bay.
 
Don't replace a used pump with a used pump before you even know what shape yours is in. You could very well be replacing it with one that is worse than the one you have.
How many miles on the sled?
Pull the pump and check the shaft. If it looks good there will be no problem running the sled, the pump will not suddenly "fail". Run it and check the oil consumption. Your pump may be fine.
The oil consumption increases slowly over time. There is no problem running it that way, except for having to add oil more often and possibly fouling plugs sooner. That sled will take a lot of oil even with a perfect pump.
 
Hate to resurrect such an old thread, but I fear my oil pump may have failed. It's sucking lots of oil and she smokes like a banshee. I've heard the pumps run wide open when they fail. I've got a 98 Vmax 700XT with 6100 miles on it. Just curious how hard these are to replace? Looks like the motor has to be removed to get at that bugger. Anyone have any experience replacing one?
 
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