My Two Stroke Doesn’t Rev Out!

so the 125 is not running too hot let’s
pull it in the shop and figure out what’s up with it alright first off I’m
gonna run through the most common and simplest issues that lead to a bike not
wanting to rev out so first off I have to get it out of the way make sure
you’ve got enough fuel in the tank and on a two-stroke check your mixture ratio
if you’re running it too rich that could cause it to not want to rev out I run my
mixture at 32 to 1 next up especially on a two-stroke replace your spark plug and
then the dirty or over oiled air filter will restrict air flow and cause it to
cut out at high rpm a couple more simple things to check over that could cause
the bike to not want to have out would be a plugged up petcock valve here on
the gas tank so I’ll pull it apart make sure it’s all clear and then up on top
here on the cap if the vent is plugged up that could restrict air flow or feel
flow and cause the same issue and then it’s pretty common on two strokes a
cracked or chipped Reed that could do it too so you have to pull off the
carburetor slide out the roof cage and inspect each Reed so if you’re gonna be
pulling the carburetor off the bike I would definitely recommend splitting it
apart and doing some cleaning a plugged up main jet would definitely cause some
issues and a few other things that look over as well would be plugged up vents
or vent hoses a Mis adjusted fuel screw or if the carburetor needs to be
rejected really bad that’ll cause it to not want to rev out – another thing to
consider around the carburetor an intake area would be air leaks so look around
the joint between the air boot and air box fitting between the air boot and
carburetor also between the carburetor and intake manifold and around the reed
cage as well so if you spray starting fluid around all those connections and
joints with the engine running and the idle goes up slightly that means you
have an air leak somewhere oh and one more thing to check out on the
carburetor make sure the choke is operating properly a choke that a sticky
could definitely be a cool Britt one more simple thing to check out
before we get into the serious stuff a plugged up exhaust system is definitely
a possibility too the most likely scenario would be a
silencer that has packing that’s just soaked in oil so worth pull not apart to
check out and this scenario isn’t very likely but it’s worth mentioning so if
the I’d your bike’s sitting for a while there could be a nest or bird inside the
expansion chamber I’ve seen it happen before so definitely worth checking then
do and if you’ve been through all that and you still haven’t solved the issue
yet I would start digging into the electrical components so if you have an
ohmmeter and a service manual you’ll be able to
test the stator which is underneath the flower cover here and the ignition coil
which is usually tucked up inside the frame on most bikes
unfortunately the CDI box is something that cannot be tested and then if your
bike has an exhaust valve like this one does I would check into that next a miss
adjusted sticky or dirty exhaust valve will definitely be the cause of some
issues the last two things we’re gonna check out are somewhat in-depth you’ll
have to turn into the motor a bit so a worn top end meaning low compression is
something to look for and that would be worn out piston worn rings or a damaged
cylinder and then a leaking crank seal would be the last thing I would dig into
on the left side here you’ll have to remove the flywheel cover the flywheel
and stator and then you’ll be able to get a glimpse at that crank seal and
then over on the right side this is a little more in-depth you’ll have to pull
off let’s see here water pump cover both the outer and inner clutch covers
possibly a few gears inside and then you should be able to check out that crank
seal so the majority this info was directed towards the two-stroke but you
could apply most of it to a four-stroke as well and then if you have a
fuel-injected four-stroke there’s a whole host of other things you could
check over that could include fuel pump fuel filter throttle body injector
condenser regulator see what else yeah there’s a whole host a whole lot of
other things you could look over so I think I’ve ran through pretty much every
possible center and now I’m gonna figure out what’s up
with this bike hopefully I don’t have to tear and do it too much so the first
thing I’m gonna look at is the fuel and make sure there’s actually gas in the
tank pretty obvious deal yep tank is full and I know I just mixed that fuel
at 32 to 1 so that is not the issue the next thing I’m gonna check out would
be the spark plug just gonna go ahead and replace this one so the spark plug looks fairly normal it
doesn’t look like it’s majorly fouled out or anything I mean there’s nothing
on it but I don’t see a reason why that would be the issue I’m just gonna go
ahead and replace it anyways by the way you can pick up these two
Stoke stickers over at prime MX com all right I’m gonna fire it up and see if
the spark plug did the trick well it was that simple she’s all good
to go now it’s funny it’s actually happened to me before on this one 25 and
several other bikes as well so spark plugs are just like any other
part they wear out to kind of a bummer though I wanted to tear more into this
bike and give you guys some great content but for my sake good thing it
was an easy fix alrighty guys that is gonna wrap up the
video if you’d like to support the channel and add some flavor to your
bikes or your truck pick up some stickers over at prime MX com
thanks for watching everyone


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