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Blaster oil injector...let's get to the bottom of this!!!

This is a discussion on Blaster oil injector...let's get to the bottom of this!!! within the Yamaha YFS200 Blaster ('88-Present) forums, part of the Performance /Technical category; What's the deal with the Blaster oil injector? There has got to be an answer! There is ALWAYS an answer! I resently had my girlfriends ...


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Old 05-23-2003, 08:58 PM   #1
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Default Blaster oil injector...let's get to the bottom of this!!!

What's the deal with the Blaster oil injector? There has got to be an answer! There is ALWAYS an answer!

I resently had my girlfriends Blaster sieze up...click here to read about it.

Well, heres the thing...I'm an auto technition (mechanic) by trade, and I can't stand to repair a problem without knowing "why it happened in the first place".

Mechanical problems are avoidable and I for one would like to finnaly get to the bottom of the Blasters injector problem! I always read about the problem, but I never see a solution....exept for "Block-off kit and pre-mix the fuel".

Well, this set up is obviously a good concept for those who ride the Blaster the way it was intended to be riden, sport...NOT COMP!. But what is the deal with the injector system?

Does anyone have any ideas, opinions, thoughts, solutions, reasons?

A fifteen year old design CAN NOT be the blame! Yamaha would not continue to make the Blaster with a faulty injector pump for FIFTEEN YEARS!!!

Everyone, please, give your thoughts and opinions so we can possibly get to the bottom of this!

There is ALWAYS an answer!

Let's help each other out!
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Old 05-23-2003, 10:52 PM   #2
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My take on this issue is that I do not think it is a problem with the pump not working, but a problem regulating the amount of oil the pump is pumping into the engine. It seems to me that there is nothing to dictate how much oil is is being pump so the pump doesn't work harder for less oil and easier for more. But behold yet another fualty pump has killed my brothers blaster in the last week. So maybe Yama just doesn't want to admit any guilt here. this is all just my opinion.
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Old 05-23-2003, 11:33 PM   #3
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might also be what kind oil you use..the pureness of it...or the pump in the carb gets messed up
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Old 05-23-2003, 11:38 PM   #4
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Another thing that causes oil injector failure is using the wrong oil. The Injector system was designed for Injector oil, which is a thinner oil,so it flows easier through the small lines.
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Old 05-23-2003, 11:57 PM   #5
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1fatcat where in MN do you live.. I live in Glencoe near hutchinson
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Old 05-24-2003, 10:24 AM   #6
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I live in Mankato.

I'm not sure what other people have been running for oil, but our Blaster has only had Yamalube 2 stroke injector oil run in it and that didn't save it.

I have a theory, tell me what you think of this.
Maybe the oil in the resivor bottle gets sloshed around while riding and creates air bubles to get sucked into the pump inlet line? This would cause the pump to inject air instead of oil at times.
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Old 05-24-2003, 10:40 AM   #7
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fatpussy your here. why the hell are you here. this is slim shady.lol
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Old 05-24-2003, 06:25 PM   #8
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I've ran into "faulty" oil pumps before. They are rarely faulty and the blame lies in the operator of the machine. Of course you're gonna hear things like "I kept the resevior filled" but how do you know its getting to the pump easily, or that the pump is adjusted correctly. You cant just dump it in and go. Like all other parts of the bike the pump needs maintenence. I used to clean out my lines every few rides and test the pump at least once a month and mine ran perfectly.

Like my dad tells me all the time, take care of your stuff and it'll take care of you.
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Old 05-24-2003, 07:00 PM   #9
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what do you mix the gas at when you dont have the injecter on it?
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Old 05-25-2003, 04:02 AM   #10
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I think BB01 may have hit it. Ive run yamalube 2s for nearly a year and last weekend drained it out and put in belndzall. the yamalube is definitely thinner, so i went for and easy ride, about nine miles, and the blendzall worked fine. I just might put a slightly larger ID hose on there tho.
I have to keep mine on for the extended warranty, and i've owned many yams in the past, and have never had a pump fail yet. Always used blendzall in days passed. We were talking about that at a vintage event ...that's why the change. lots of 30 year old bikes there with the pumps still runnin...with blendzall. hmmm.
....another Chevy Tech...
It could be a blend problem, a siphon loss, who knows. Remember when we had to use that diesel additive to kill algae in the fuel system? who woulda guessed? LOL the blendzall is a little thicker, but it is a bean oil as well, and not synthetic. the jug says mix it 30 to 40 to 1. My carb usually has slather all over it after a hard ride, from fuel, maybe we're talking a loss of siphon from a thin oil. a moment is all it would take.
let me know what you come up with..
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Old 05-25-2003, 10:18 PM   #11
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i havent had any problems wit my injector yet and i run castrol i think im not sure id have to look but i have had no problems but i will get b/o Soon prolly
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Old 05-26-2003, 07:45 AM   #12
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Well does it have anything to do with the gas you were using when it seized?

Aren't you supposed to use 92 octane?
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Old 05-26-2003, 08:59 AM   #13
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octane would not make a motor seize.

fatcat,

ok i have a few question about your problem.

with the stock jetting. could it of been set lean from the factory?

does your g/f have other experiences riding a quad/dirtbike with a clutch?

like was she shifting into the next gear when need to keep the motor from running to hard in a low gear?
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Old 05-26-2003, 09:06 AM   #14
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Quote: Originally Posted by RxRaptor02
octane would not make a motor seize.

fatcat,

ok i have a few question about your problem.

with the stock jetting. could it of been set lean from the factory?

does your g/f have other experiences riding a quad/dirtbike with a clutch?

like was she shifting into the next gear when need to keep the motor from running to hard in a low gear?
Usually, blasters are running rich from the factory...
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Old 05-26-2003, 10:22 AM   #15
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I have only run premium 92-octane fuel in it since new.

The factory jetting is 230 main, needle clip on the 2nd groove, idle airscrew 1 1/2 turns out. There was a good amount of black carbon deposits on the piston dome, head and spark plug when I took it apart, so I don't see it being a lean run condition.

The g/f drives a car with a clutch, so she does know how to ride a stick Plus, I was paying attention to her shift points when she first rode it and she was doing just fine with the shifting.

I'm starting to think that TR_Blaster01 nailed it with his reply, I can't see any way for the injector pump to regulate more or less oil to match engine load. Is there some type of internal centrifugal regulator? All of the older injector pumps I've ever messed with have all had a second throttle cable running to them which would open the pump "throttle" as the carburetor throttle was opened.
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Old 05-26-2003, 12:04 PM   #16
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ok,

what if there was an air leak. were the carb boot, gaskets all ok before you tore the top end apart?
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Old 05-26-2003, 12:12 PM   #17
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I think that the injector pump does change the amount of oil sent to the carb at various rpm levels. When the engine is revved up the pump will be turning at a quicker pace, which should be pumping out more oil.
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Old 05-26-2003, 12:47 PM   #18
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Quote: Originally Posted by edge
I think that the injector pump does change the amount of oil sent to the carb at various rpm levels. When the engine is revved up the pump will be turning at a quicker pace, which should be pumping out more oil.
Yes, this is true. It does pump more at higher RPM, but there is nothing to increase the oil amount under high engine loads at low RPM.

With the throttle at WOT and the engine at lower RPM (like right after shifting up a gear or at take-off), the carburator will be dumping in a boat load of fuel while the injector pump in only pumping a small amount of oil due to the lower RPMs.

As far as I know, there is nothing to regulate the amount of oil versus the engine load.
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Old 05-27-2003, 05:03 PM   #19
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maybe the plastic gear that regulates the pump wears out or locks or melts. IDK im no mechanic but if ur blaster just broke from the oil injector failing I would check EVERYTHING in the oil injector system to make sure of what exactly went wrong. There is one root problem somewhere.
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Old 05-27-2003, 05:07 PM   #20
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yeah ussally the injector clogs or the white gear becomes stripped or that is what i have heard of most
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