1st can you tell me how to drain the motor oil out of my trail boss 350L crankcase
and refill

2nd what type of cleaner do you recommend using to clean the reed valve

3rd are those boyesen reeds any good for a stock 2 stroke engine

 

You don't drain the "engine oil" as there isn't any in the crank case.You just add oil to the oil tank at the front of the machine. The 2 stroke oil in the oil tank supplies the oil through an injector on the side of the intake manifold that mixes with the fuel. As the gas/oil mixture is compressed,some oil residue is left to oil the rings,crank bearing and upper and lower rod bearings. The rest is burned during ignition. IF you just want to change brands,you can drain the oil tank by pulling the line at the oil pump. After refilling the tank the pump must be bled to remove any trapped air bubbles. As fat as cleaner,we used electrical and brake spray cleaner at the shop on a lot of things other than the main parts tank cleaner that we used a kerosene type cleaner for greasy parts. Boyesen reeds are ok, allow a little quicker fuel into the intake port,BUT to make full advantage of them a better flowing exhaust system helps,along with better flow through the cylinder ports(cylinder porting). All this goes hand in hand. Other than that you may as well stay with stock reeds.
Gear case(transmission) does have a 19 mm / 3/4" drain plug on the right side bottom. The fill plug is a 9/16" plug at the front. Fill to the bottom of the threads with Polaris AGL.

 

i was told to dis-connect the oil line at the filter , which is what i did
now using the polaris VES gold oil , runs a lot better now that i am using 91 octane fuel
( mixed some VES gold oil in with the fuel , just in case i did get air in the oil line )

i went to replace the spark plug ?? the previous owner mistakenly installed a NGK resistor plug
( no wonder it was hard to start ) now running it with a BR8ES champion plug
i also used half a roll of electrical tape on the spark plug wire to seal it

the 2 stroke engine is purring like a kitten now

 

It take an NGK BR8ES resistor plug. I guess you meant that instead of a crappy Champion..

 

i am using the champion BR8ES plug , the engine is running a lot better with the champion plug than with NGK plug that was in the head
the fuel/air mixture when compressed was leaking past the threads on the ngk plug
( it explains the hard starting issue with the NGK plug )

now to find a aftermarket exhaust for the 350L trail boss
mine is leaking at the cylinder head swivel joint

 

There is NO Champion BR8ES. What is the Champion part # on the plug you're using? Plus gap needs to be .032. Leaking past the threads?

 

there are 3 product numbers on the right side
RN2C labelled as the large numbers
N2C
br8es
the ngk plug threads are not a interference fit ( side to side play even when almost tight )

the champion plug exhibits resistance when you thread the plug in ( which indicates a good tight fit ) with anti seize on the threads on course
the NGK plug shows burnt gas/oil residue all the way up the threads and past the gasket with residue coating the outside insulator

 

All BR#ES series are NGK. Once it has the letter "R" on it that also means its a resistor plug as well. NGK Spark Plugs USA
There is no Champion BR#ES that's like saying a Ford corvette.

Here is the cross over chart for the NGK BR8ES.NGK BR8ES - Alternative spark plugs
Champions version is the Champion RN3C · Champion ON3 · Champion QN3 · Champion RN3 and so on.

 

Are you sure it wasn't just time for a plug change? Polaris quit using Champions(RN4YC) after 3 years in 1988(even though it's still listed in the early model parts break down) because of all the fouling problems and went to to a NGK BR8ES and never looked back on the water cooled and air cooled 2 stroke engines. They tried again in the first year of the Sportsman 700s and I had one after another come in for plug fouling(R7YC Champions) and started using an NGK BPR6ES or BPR7ES and never looked back either,especially after the "tech bulletin" came in afterwards about using NGK instead of the Champions! Again they tried using Champions in the first 850XP and had to change the heat range THREE times before they could get a Champion to not foul as soon as you hit the throttle. Many owners have finally found an NGK replacement since then.Ask any motorcycle tech about Champions and you'll probably get the standard reply " They're good only for lawn mowers" If you're happy with a Champion,then by all means use it and have fun,BUT always carry a spare!

 

the champion plug is working great
engines fires up after the 2nd starter crank
the ngk plug was taking forever to fire the engine