Rebuilding Top End on Polaris Trail Boss 250! 

Thank you! It takes a lot of work to do these videos and I do it to try and help you guys out! I’m glad it worked and I’m glad you’re rippen again!

Second actually…

Yup it’s still running! I didn’t do a compression test on it. If you only have a few scuffs I’d just hone it and do piston and rings. I was taught if you can catch your fingernail on a gouge then it needs bored or replated.

It should be pretty much dry. It’s possible the carb overflowed since the last time it ran and it dripped down the intake into the crank case. You should try to get all the standing liquid out of there. It doesn’t need to be dry but you risk hydrolocking it. If you have it together already pull the plug out and pull the motor over really fast and it’ll spray out. Do that until it quits for the most part.

@@ToyShopRestorations do you know what bolt is the drain plug

🤣🤣🤣 I don’t have the book so that’s great

yeah i specifically came to this video hoping to see somthing about that pesky motor mount. i can't get the bolt out, even with a punch.

@@tuggerman84 I suffered that same thing. It's not a bolt it's one solid peice so it can't be removed that way. Have to remove from cylinder

I don’t think I primed it but I don’t remember. It never hurts to run a gallon of premix in it and then go back to straight gas.

Check the recoil video for the flywheel and/or the starter video. In one of those videos I had to take the flywheel off. But bearing, I didn’t have to do that on this quad so that’s a no 😅

No I don’t put any sealant. Just clean each surface and put new gaskets on. New gaskets are impregnated with a sealant and will liquify and stick during the first couple heat cycles.

I have one where I’m cleaning a carb on my channel

I’m not sure what you’re asking 🤔 I don’t usually measure anything other than the bore to make sure the piston is correct.

@@ToyShopRestorations I ask you how many inches of difference between the diameters of the cylinder and piston should I have if I use a wiseco of 73.5mm for a polaris trailblazer 250 2t, also, the minimum and maximum opening measurements of the rings.

@@cristobalmannsrosselot ohhhh um that should be specified by the piston. The piston should have came with a little book that specified the ring end gap and might give you piston clearance. If not I’d get on wiseco’s website and see. Should be the same spec for all of their 2t pistons.

@@ToyShopRestorations thanks so much

Head bolts 18 to 20 ftl-bs. Cylinder base 25 to 29 ft-lbs. Crankcase 6mm 72 to 92 inch-lbs. 8mm 17 to 18 ft-lbs. Hope this helps!

@@ToyShopRestorations thanks!

I’m not sure. I’ve never done a 350 before. This video is pretty similar to all 2 stroke videos so I’m sure there’s a lot of similarities!

But now you’ll know for next time! 😂

If I had to guess I’d say doing a top end took me probably 5 hours all said and done.

I bought it at napa.

This is a 2 stroke. It doesn’t have valves

😂🤣

7.24? Stock size is 72mm

@@ToyShopRestorations yea stock is 72 mm but my jug is 724

@@ToyShopRestorations its .o4 over 72mm

@@ToyShopRestorations i think standered will work but not 10. Under

@@billhamby6230 ya standard size should be fine!

I didn’t? 😳 did I say what the torque was? 😅