Suzuki 85 year identify and problem

[FireAm94]

I have a suzuki 85hp with the serial 8051 921703. The motor is gray and black with gold lettering. What is the year? Also I dont' see the plug gap listed on the motor...what is the proper gap? The gas has been sitting for about 8 months. It seems to idle rough and will not go above 1600 rpm. Trying to give this thing throttle is like balancing on a tight rope with a bottle of chlorine and alchohol in your hand. It does not want to take throttle. I've never let gas sit and was curious if this could be bad gas....it doesn't seem to smell completely normal either but I can't describe it. It still smells like gas but it's a different smell.<br /><br />Joe

 

[jim dozier]

Re: Suzuki 85 year identify and problem

If the engine was running OK previously (8 mos ago) it is probably a combination of old gas and dirty carbs. Your description is that of a dirty carb. The Mikuni carbs on your Suzuki like to be surgically clean inside. Get rid of the old gas and get some new gas. You need to pull the carbs and do a thorough cleaning/rebuild with carb cleaner AND compressed air. Install a rebuild kit, set the float and idle air screw to manual specs. That engine will run good with clean carbs.<br /><br />You used to be able to find the year off of www.brownspoint.com but they have changed their website. Any dealer will give you the year when you order the rebuild kit. There are only minor changes for the most part between years.<br /><br />Now would be a good time to go to the bottom of this web page and order a manual for your motor.

 

[FireAm94]

Re: Suzuki 85 year identify and problem

I assume it's not a difficult task to undertake (rebuilding the carbs). I purchased the Suzuki brand service manual and 3 carb rebuild kits...will that provide enough instruction? I'm a fuel injection LT1 guy and havent had a great deal of experience with carbs...other than changing needle and jet in my quad. Also...anything I need to do other than siphoning the fuel out of the tank? BTW....it was a 1989 model motor.<br /><br />Thanx<br />Joe

 

[jim dozier]

Re: Suzuki 85 year identify and problem

The carbs are very simple. You will be cleaning the jets and orifices with carb cleaner AND compressed air. Make sure you get them all. The rebuild kit is just a new float valve and some gaskets. Remove the carb bowls and install the new float valve and set the float height to manual specs. Put the idle air screw (meters air so unscrewing it leans the mixture) back in to the manual specified number of turns out from lightly seated. There are any accelerator pumps, just a single venturi and a couple of jets and orifices. Sychronize the carb linkage with the ignition timing linkage (if your ignition timing is electronic yours may be different than mine) according to the manual. Set the idle with the engine in the water in forward gear.

 

[FireAm94]

Re: Suzuki 85 year identify and problem

Is the sync normally very difficult? Also is setting the float height something that is very tidious using a caliper and such?<br /><br />Joe

 

[jim dozier]

Re: Suzuki 85 year identify and problem

The sychronization isn't difficult. Its explained in the manual. It might be a little different when they changed to electronic timing instead of mechanical. The floats are set by bending the tab to increase or decrease the distance between the bottom of the carb bowl (it done with the carb upside down) and the float. Use a small fine marked ruler or a set of adjustable calipers.

 

[FireAm94]

Re: Suzuki 85 year identify and problem

Will there be anything else I need to do after syphoning the gas out of the tank...as far as the tank goes...or just fill her up with some 93 octane and seafoam?<br /><br />Thanx for all your help.<br /><br />Joe

 

[jim dozier]

Re: Suzuki 85 year identify and problem

If you have an inline fuel filter you should probably replace it. If you don't have one get one. That should be it. Don't waste your money on 93 octane. Most 2-strokes including this one are low compression engines and you only need 87 octane (USA). You can use the old gas in your car, just dilute it (use a little at a time in a full tank).