So I just recently got an 08 kx450f. It has a lottt of compression the kickstart snapped from the prev owner. My friends and I were thinking valves I’m gonna take it off and check with my feeler gauge and make sure everything is in time. Other problem I have is the cam cover the threads for one of the head bolts must have snapped and the guy I welded it closed 🤦♂️ I can’t find any replacements. The bottom of the motor where the oil drain bolt is has jb weld all around it too. I’m assuming the guy just saw it leaking from an old crush washer and didn’t know what he was doing I’m not sure, but what’s the best way to remove jb weld? I’m kinda knee deep in this bike right now…
I need some suggestions, I have a 2011 kx450f and it won’t start at all, just pops. Even with starting fluid. It has good compression, fuel and the timing is good on it. What should I do now.
@@brohammerbarton885 since it’s technically within spec I’m not to sure. It’s on the tight end but idk if it’s tight enough to not start the bike. You can do it anyway and try to get it in the middle
I have a question why do you need to change valve shims? Do they wear out or something? And changing the shims isn't the same as timing the valves right?
I don’t think the shims wear out overtime it’s the valves that end up changing and the shims help keep the gap correct. I’ve never really herd of valve timing. I’ve heard of timing the engine? It’s just valve adjustment. Basically making sure the gap between the cams and buckets arnt to tight or to big
@@slavsquad Lets say your exhaust valve opens too late causing backfire well i believe that is what causes backfire, what do you need to do then, do you need to change the shims still?
@@hyposez1129 yes if your valves are out of adjustment you’ll need shims. Only way to know what size is to take it apart. Measure the gap with a feeler gauge and measure the shim that’s in there now and do the formula and steps that I show in the video. Also backfiring can come from other areas other then valve. Most common are -header crush washer leak - header junction leak - hot start stuck open or corroded - loose/leaking carb boots - missing o-ring from fuel screw - fuel screw out too far - too small pilot (or clogged pilot) - vacuum plate seal on slide needs replacing
Just did a top end on a 2009 Kx450f now it won’t stay running without the high idle pulled out you have to keep a light rev to keep it going but once off of throttle it dies seconds later
I’ve never done it but was always told not to mix around the buckets. Shims don’t matter cuz you can always measure the valve clearance and you’ll know if shims are wrong size. I’m unsure what you’d need to do if buckets were mixed around. I don’t know if you can just put them all on anyway and measure valve clearance and if they are in spec and run it? I’ve never had to deal with is yet
A=(B-C) + D. A is the New Shim size. B is your current Valve Clearance. C is the Valve clearance your suppose to be at aka specified valve clearance. D is the old shim thickness. you do this math equation to get the right shim size so you have the proper valve clearance. So take your current valve clearance and minus that from the valve clearance your supposed to have and then add the old shim thickness and you'll get your new shim size you'll need. I hope this helps. maybe ill make a video specifically explain this equation in the near future.
Aren’t you supposed to rotate the engine counter clockwise?
So I just recently got an 08 kx450f. It has a lottt of compression the kickstart snapped from the prev owner. My friends and I were thinking valves I’m gonna take it off and check with my feeler gauge and make sure everything is in time. Other problem I have is the cam cover the threads for one of the head bolts must have snapped and the guy I welded it closed 🤦♂️ I can’t find any replacements. The bottom of the motor where the oil drain bolt is has jb weld all around it too. I’m assuming the guy just saw it leaking from an old crush washer and didn’t know what he was doing I’m not sure, but what’s the best way to remove jb weld? I’m kinda knee deep in this bike right now…
My 2017 kx450f is hard to start, is the process basically the same?
I need some suggestions, I have a 2011 kx450f and it won’t start at all, just pops. Even with starting fluid. It has good compression, fuel and the timing is good on it. What should I do now.
Does it have consistent spark? Have you adjusted valves? Carb is not super dirty? Air filter cleaned and no obstructions with air flow?
Everything thing is good but the intake Valves seen to be tight at .10
@@brohammerbarton885 try starting there. And triple check your timing is correct. Make sure the cams are pointing in the right direction
Ok do you think the intake valves need shimmed?
@@brohammerbarton885 since it’s technically within spec I’m not to sure. It’s on the tight end but idk if it’s tight enough to not start the bike. You can do it anyway and try to get it in the middle
I have a question why do you need to change valve shims? Do they wear out or something? And changing the shims isn't the same as timing the valves right?
I don’t think the shims wear out overtime it’s the valves that end up changing and the shims help keep the gap correct. I’ve never really herd of valve timing. I’ve heard of timing the engine? It’s just valve adjustment. Basically making sure the gap between the cams and buckets arnt to tight or to big
@@slavsquad Lets say your exhaust valve opens too late causing backfire well i believe that is what causes backfire, what do you need to do then, do you need to change the shims still?
@@hyposez1129 yes if your valves are out of adjustment you’ll need shims. Only way to know what size is to take it apart. Measure the gap with a feeler gauge and measure the shim that’s in there now and do the formula and steps that I show in the video. Also backfiring can come from other areas other then valve. Most common are
-header crush washer leak
- header junction leak
- hot start stuck open or corroded
- loose/leaking carb boots
- missing o-ring from fuel screw
- fuel screw out too far
- too small pilot (or clogged pilot)
- vacuum plate seal on slide needs replacing
@@slavsquad Thank you man! I learned so much from your video and your replies, big thanks dude!
@@hyposez1129 my pleasure! Glad I can help!
Just did a top end on a 2009 Kx450f now it won’t stay running without the high idle pulled out you have to keep a light rev to keep it going but once off of throttle it dies seconds later
Does it has an rpm adjustment on carb?
Pilot jet sounds like it’s plugged
@@mxr248 09’s are efi
What happens if you end mixing the buckets for shims? All of them
I’ve never done it but was always told not to mix around the buckets. Shims don’t matter cuz you can always measure the valve clearance and you’ll know if shims are wrong size. I’m unsure what you’d need to do if buckets were mixed around. I don’t know if you can just put them all on anyway and measure valve clearance and if they are in spec and run it? I’ve never had to deal with is yet
@@slavsquad are the buckets a each certain size but thx u I’ll see and run just it
@@steven-_-vids4000 I was told they are different based of how they were worn overtime but the same when brand new.
Also ppl wash your bike before opening it up. I see too many ppl doing this and it can cause problems for you if dirt gets in there.
What the means A B C D..??
A=(B-C) + D. A is the New Shim size. B is your current Valve Clearance. C is the Valve clearance your suppose to be at aka specified valve clearance. D is the old shim thickness. you do this math equation to get the right shim size so you have the proper valve clearance. So take your current valve clearance and minus that from the valve clearance your supposed to have and then add the old shim thickness and you'll get your new shim size you'll need. I hope this helps. maybe ill make a video specifically explain this equation in the near future.