I'm still on my first tank of gas on my new Trailblazer 250. And I've noticed a knocking sound when I let off the gas. Not a constant knock just once each time after letting off the gas. I'm hoping this will go away after this oil/gas mixture for the first tank has gone through the system. Any suggestions of how to make it go away. It is under warranty. But the dealership is kindof **** and the less I have to do with them the better. There are two dealers in my area, and one does the oil/gas mixture for the first tank,(the dealership I went with) and the other doesn't, saying it will fowl the plug. So here is my questions. Is the knock normal and was it good for them to do the mixture. I checked my owners manual and it did say to do this. Also should I let this tank of gas go completely dry until adding new gas are should I go ahead and just add new gas. Also what octane 87? Last question. How does the reserve gas work. Since it is a oil/gas mixture in there now. Will the reserve gas need to be used? Is it in a separate compartment? I know these are stupid questions, but I know my limitations when it comes to these things. Thanks

 

The oil/gas mix is a good idea, just in case there is air or problems with the oil pump. It is also a good idea to try to get all that mixed gas out when the tank is empty, yes use reserve. After you have ran all the gas out, change the plug because yes it will run rich and may foul. The reserve pickup sits lower in the tank than the regular pickup, so the reserve just pretty much drains the bottom of the tank. It is not a good idea to use reserve too much though because it sits low and trash may accumulate at the bottom of the tank and reserve may flush it out and clog up a filter. Octane 87 is fine to use in the TB. There are no stupid questions, one learns by asking and the one that doesn't ask messes something up is stupid. [img]i/expressions/face-icon-small-smile.gif[/img] As far as the noise, let it get broke in a little and see if it goes away, it could just be the clutch, belt breaking in, like you said it is under warranty, so don't worry for a while unless it gets worse.

 

since this is a new machine and it is 2 stroke, did you double up on
your oil for the break in period( oil in oil reservoir and oil mixed with gas
in gas tank).. should give u the amount to add in the owners manual,
and this is only during the break in period.. then, just let the oil injection
take over..

Is this your first 2 stroke,, they usually make more noise when letting off
the gas...

 

sorry, didn't get your complete post the first time..
I see u doubled up on the oil... u don't have to run the gas tank
dry, it won't hurt a thing to just put gas back into tank,
just don't add any more oil after the break in period to the gas tank.

also, make sure your oil reservoir is full because u don't
want it to have a dry spot if you're on a steep hill..

check the oil reservoir after 3-4 hours of driving to make sure
the level is going down and the oil injection is working properly.
it will only be a slight amount used but enough to tell if you're
using oil or not.

 

all polaris engines on their atv's are made to accept 87 or 89 octane..
polaris does not recommend anything over 89...

93 octane is not advisable in a polaris atv and is totally unnecessary.

 

irsonly is right about the octane. Dont use higher octane. 87-89 is fine. You only need to use higher octane when mods are added. The knock is normal when you let off the throttle. All the 250's do it. You will notice it more when it is cold outside and less when hot outside. Dont get worried. If it knocks all the time through the rpm range then get worried. It is not necessary to run the tank completely dry. When you go through the first tank and then fill it again the amount of premix from the reserve will be minimal. After you check the oil tank after a few tanks of gas you might think that the oil injection is not working properly because it hardly moved but this is normal also. It uses very little oil in the injection. You might go for months before you will have to fill it up again. I fill mine about 2 times a year even with the mods and I ride almost every weekend. It is very efficient in that area. The proper break in would to do short full throttle bursts every couple of minuts when riding. Dont go long periods of full throttle. The engine will actually be quicker after break in if it is not completely babied for the first tank or so. If you dont get on it every once in a while the motor will end up being tight and will not be as quick. Remember short bursts full throttle then just cruise. Pretty soon you will want mods. It is practicly unavoidable. Good luck with the new quad and be safe. Wear your helmet!!!! It is not stupid to wear your helmet.

 

I wouldn't let the oil reservoir get over half empty before
refilling it.. I really can't tell you how often to do it because
that all depends on how much u ride your 250...
I know on my 250( no longer have it), I only used 1-2 gallons per
year of driving..

Just don't let it get too low as to cause any dry spots when
going up or down hills... that could harm your engine.

Polaris makes a very good 2 stroke synthetic.. whatever u decide
to use, be advised, the synthetic oil will really make a difference
in longevity of the engine.

 

don't be riding full speed when it runs out of gas, then no oil is getting into the engine to lube it while it revs down and that is no good.

 

As long as the crank turns it will get oil even if you run out of gas. But the oil will not get to all the places it needs to lubricate. Chances are that nothing will happen but if you are going down a steep hill and ride all the way down when you are out of gas some damage can occure. If this ever happens then just throw it in neutral. This way the crank will not turn and there will be no dry friction.

 

Thanks all for your suggestions and help, I'm planning on riding today until the gas mixture
is used up both in reservoir and main tank. Then put in some fresh 87 octane. Sounds like 89 every so often would be okay. During the break in period I would hit it hard for a second or so then just tool around. I'll be glad to be done with this tank of gas. It's supposed to rain today, so tomorrow should be a great day to hit the trails. I've got a rock guard on order and was told not to get a front A-Arm guard protector or a swing arm guard. Any advice on this. Seems like it wouldn't hurt to have it. But if not necessary I'd rather save the money.