new to atv world. bought a 250 trailblazer for my daughter and it ran great. she shut it off the other day and it wouldnt start again. check fire and there seems to be plenty. has 90 lbs compresion. seems to be getting gas exhaust isnt pluged. dont know where to go from here. dont want to just start throwing parts at it. anyone have any ideas

 

Sorry,but 90 pounds compression sounds like the problem.Anything below 115-120 psi is on the low side as far as compression goes. Probably needs at least a new top end,plus I wouldn't overlook crank seals. Have the cylinder measured and bore to the next size over to clean up the bore.Plus it must have NO up and down play on the rod(side to side play is ok) or the crank shaft would have to have a new rod kit and bearings.

 

thanks for your reply. i was hoping to get your opinion. you sound like you really know. i was under the impression that 90 was enough. but ok. i have reasonable mech knowledge but not havent messed with 2 stroke for years. can i change both crank seals with out splitting cases. i understand about the rest as i have most recentlly done alot of diesel work. gonna get started tomorrow. again thanks for the info.

 

Not necessary to split the cases to replace the crank seals,but you have to pull the drive clutch and on the other side the flywheel and stator plate to get to them.

 

thanks for the help

 

Moved this over to the Polaris forum so others can benefit from OPT's advice if they're having the same problem.

 

hi i have a 93 polaris 250 4x4. And i just unplugged the etc, new plug, New chain and sprocket. And after all that i can't go through puddles because the belt gets wet and slips bad. Is there a good fix for this?

 

Could be the engine to backing plate seal is damaged allowing water in.Usually the case if any water puddle affects it.Either that or the clutch cover seal or even possible the air exhaust duct rubber connectors are split allowing water in that way.Item #26 is the engine seal.Dirt Cheap Yamaha, Polaris, Suzuki & Kawasaki OEM Parts & Accessories – Cycle Parts Warehouse

 

is there an at home fix?

 

If it's the seal and you're talking about "rigging it",then no it needs to be replaced.Usually they get damaged by sticks and branches that punch holes in them.Silicone patching doesn't help that much,plus if you're that far just replace the seal. Same thing for the clutch cover seal or clutch cover intake/exhaust rubber connections.They just need to be replaced f damaged. If it's the seal the drive clutch has to be pulled to get to it and takes a puller.Or you can take the dimensions of the puller 3/4" x 16 pitch and see if you can get a long enough bolt at a hardware store.