How to Install/Replace: 1988-2003 Polaris Trail Boss 250 350 400 Crankcase Seals Seal Installation

[@baylertolman9910]

U saved my life my trail boss 350 wonte start after a new top end and now Ik what it is thank you

[@jokerrr14]

Having same problems

[@tomascharles5080]

Im getting a 250 now I know what to do if it comes to that thanks for showing us how its done.

[@d.r.hopkins9944]

Very helpful video. Was dreading doing this because I thought that the crankcase had to be split. I have a 300, hope it's the same as these. Look's the same to me.

[@BrapStuff]

All Polaris 2 strokes are pretty much the same. Luckily the ATVs (Trail Boss, Xplorer, 350L, 400L, etc) can be done without splitting the cases.

[@lazzer408]

What size bolt for the clutch?

[@leesuschrist]

I have a 1991 350l trail boss and I think this is exactly the problem I'm having. I've got oil all over the skid plate and some even got into the starter and ruined it. Thanks for making this video!

[@BrapStuff]

No problem let me know if you have questions on the rebuild!

[@pigseye2]

Excellent and educational video. Thanks for sharing!

[@ezekielchery6892]

i think my atv has the same problem keep up the good work and thank you.

[@Eli-tg5xz]

What bolt did you use for the clutch

[@nathanielsmith1246]

I like this video because mine was doing the exact same thing so I was gonna do gaskets new piston seals so I split the case to find out my crank bearings are fucked

[@tttco]

Thank you for posting

[@osbornebay944]

Another Super Brra, Brra, Brra, good job!

[@bewdleyboi9523]

Nice video bud ...would u happen to have a diagram for the vacuum lines /hoses or could u make a video lol

[@jacobcuster1929]

I have a players 250 Trailblazer my crankshaft is sucking air what should I do do I need to replace both of the crank seals

[@FarmersforTruth]

1991 polaris 350l 4x4 counter balance oil

[@davebocci9097]

Are both sides the same size seal? if so do you have a part # Thank you!

[@pico67ss]

Are the seals the same for the 250/300 and the 400

[@davidh8126]

wHAT´S THE SIZE OF THE THREAD BOLT THAT YOU USED LIKE PULLER?

[@freddym.1489]

Not sure if too late but it's a 3/4 fine thread, 16 threads per inch.

[@richlozeau1665]

Excellent vid! 14 mins of gold! May I ask how similar this quad is to an 85 Trail Boss 250? Thanks!

[@eathans_small_engines8665]

Same bottom end I believe

[@jcortiz111]

thanks for the video..

[@cheyenneireland5133]

Would it leak gas out of the seal of it was worn?

[@jeffsmodifications5965]

Ok question what size bolt did you use to pop off the clutch also went on to polaris parts nation looked at there diagram for a 2000 polaris 250 trail blazer alittle confused the one on the stator side I see is correct but on the clutch side 1 part number on the block side shows 1part number then when you go to the clutch cover parts diagram shows a different seal any help would be greatly appreciated

[@nlastname7441]

I used a fine thread 3/4 inch bolt and it worked fine.

[@DanyAtv861]

Excelente video

[@itchyprince3793]

Do you happen to know why mine shakes so bad?

[@kennethrose7446]

Where did you purchase the seals from

[@creekfishermenoutdoors936]

May be a dumb question but can this cause loss of compression

[@BrapStuff]

Compression takes place in the cylinder, when the piston is rising.

[@Edmunddumas6987]

I'm working on a 1993 Polaris Big Boss 6x6 the main output shaft sheared off. It was brought to a shop got repaired then broke again. My neighbour sold it to me for scrap. I was able to get a shaft. I don't want it to break again after reinstalling the gearbox. Any idea as to what would cause the shaft to shear off? Thanks! Oh and by the way your videos are awesome!

[@cbc812]

I have a scrambler 400 using balance shaft oil. How hard is that to fix and do you have a video. Thanks

[@BrapStuff]

It's likely a bad crank seal. It would be the one behind the counter balancer timing gear on the crankshaft.

[@cbc812]

@@BrapStuff thanks buddy

[@Revoku]

I got a free 93 trail boss 250(I think 250) 4x4 same procedure works but you have to get around the front wheel drive chain n cover

[@DCunknownissue]

What kind of sealant did you use on the outside of the seal ?

[@BrapStuff]

Any rtv, gasket maker, anaerobic sealant, or nothing at all is fine.

[@DanielPerez-ov8uj]

I might have pushed my seal a little to far, would this be an issue???

[@BrapStuff]

I don't think that will be an issue. Run it! :)

[@JuanRamirez-rr1qk]

I just can the fricking flywheel out. I broke two sets of bolts already and it wont budge. Whats the trick.

[@BrapStuff]

Stronger puller/stronger bolts.

[@77snickermilk]

What size bolt are you using to remove torque converter thanks

[@connersnow298]

Nice vid

[@HorsepowerHouse]

And it fires up first fricken pull. I am working on a 2006 Polaris Trail Blazer 250 (2-stroke) and it is giving me fits. Checked everything 100x over and nothing seems amiss regarding spark, air, compression, fuel. No leaks from the crank seals either. It tries to fire the first pull - then nothing. We have changed, replaced, inspected, cleaned, etc literally everything among everything. And cannot get this thing to run. So pissed about it too. If anyone has a magic answer (beyond the usual compression, spark, fuel, air comments) we are all ears here......... Checked the emergency throttle cutoff switch as well. And it's fine. CDI new, Coil new, Stator new, spark plug new, fuel new, carb clean and rebuild, new, everything new and checked over and over.

[@BrapStuff]

Spark plug might spark outside cylinder but not in the cylinder. Make sure you change it with a known good one. Also if you mist gas directly into the carburetor when trying to start that should give you an idea what’s going on.

[@HorsepowerHouse]

@@BrapStuff tried two brand new ones. Both worked fine in other motors. Both gapped precisely. And the spark plug is getting lightly damp after a few attempted starts. So it is obviously getting fuel. Float level is perfect in the carb as well.

[@otisritschard2629]

@@HorsepowerHouse Try pulling the exhaust off used to work on snowmobiles long ago be amazed at what will build nest in them backpressure can cause a fire on first pull then flood the plug. other than that recheck new cdi/stator could be bad I have a bayou that drove me crazy (and some days its a short trip) new cdi was bad it checked out good but wouldn't run right old one would run until it warmed up then act up a 2nd new cdi all was good as least as it can get for a kawasuki

[@jimpenny842]

@@BrapStuff what's the parts # on those seal

[@jakea5157]

Purrs like a kitten now

[@JacobScherer]

Damn dude, engine sound was loud a AF

[@BrapStuff]

Loud = Fast :)

[@yourselfdotcomlol]

Good video of 👍🏻