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^^Agreed.

Have you tested the igniter? You can ohm out the secondary circuit on these btw. Check for continuity between the spark plug boot & ground.

I have a couple cylinders if you need one.

If you are getting intermittent spark, check for water inside the flywheel cover. If there's water, the stator & flywheel magnet contacts are probably rusted. What have you ohmed out so far?

What are your spark issues?

Thats a great idea for that fix! Alot of guys have had issues with this gear.

The SBN38 is well worth it. The stock BN 34 chokes the 300 out.

Correct plug is a BR7ES. You can test the stator before pulling it all apart to see if somethings wrong. Ohm out black & red wires, see if your getting continuity.

Sounds like it free rev'd. Start checking for air leaks.

Yes, that ebox will work. Stator is toast. Look around, you should be able to find one for a decent price.

That thing is bone stock. Still has the oil injection hooked up. Worth nowhere near $650. I would pay $2-300 tops. I can usually pickup a mint js300 or 300sx for under $200, and sometimes free!

I have one, PM me.

Its not hard to title ski's in MI with no title. The Sec. of state has a bill of sale form that you fill out online. Get the VIN, MC #, & the last year it was registered if those stickers are still on it. Go to the branch. They will do a title search to make sure its not stolen. If its good...

Agreed. Yea, looks to be in good shape, but its still a 300. If I were you, I would take the 300sx. It would interesting though to see what exactly he did to the engine on the 440, meaning if he actually replaced the crank/seals/bearings or just top end. I've owned both skis and my 300 was way...

Google search or go to Pwctoday.com. This a popular build right now, alotta guys are doing it so theres alot of info out there.

Spark plug should be a NGK BR7ES gapped bewteen .028 -.031. If its back firing, its out of time seeing that you have good compression, spark, & fuel. Check the marks on the stator & engine case. Are they lined up? If not, where are they. The mark is at the 12 o'clock position on the case and...

Kerkers & Mariner both make a pipe for the JS300 & you can usually find them on ebay. Many guys claim these are good for 10hp alone on the 300. My buddy has a Mariner on his & I'd have to agree. You can slap a 38sbn carb on as well which will also wake it up. Other things you can do are mill the...

If the starter turns the motor over when the plug is removed, but not when its installed, either the one way clutch is toast or its loose on the crank. The clutch uses a tapered fit & pressure from the coupler to grab & spin the crank. There is no key or splines on it. When you look at it, the...

The 300 uses a one way starter clutch system on the back of the motor. If you look, you will see a dipstick. It is behind that cover. The starter spins a small gear which in turns spins the larger one way clutch gear which rides on the crank. It is not a huge job to pull the motor and mess with...