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