I know when i was running the vm22 i had to go to a 17.5 pilot jet(15 stock)mess with the air/fuel screw(that's a pain)and the main was fine.

 

Well I think my main should be good as its high at a 115 and my pilot is at a 15..
I have a 22.5 pilot I can try and also have a 87.5 main but i think thats wayy to lean for my altitude

 

lahay - how old is the bike and how many hours?

Classic symptoms of a tight exhaust valve as well...

GLTY

 

4 hours on the motor...but you were on the right track... I think its the exhaust seal or gasket I can feel air coming out

 

Popping backfiring= lean

 

If the bike is popping on deceleration I would look for a bad exhaust gasket. If the bike is popping at wot check the valves. Check the head bolts, make sure they are tight. Also raise the main jet size a lot. Jets are cheap and that will eliminate a lot of questions.

 

[h=1]Engine and Carb quick check list - TBolt USA Tech Database![/h]
Install Intake manifold to head and carb, oil gaskets and tighten bolts lightly at first then torque then down gradually in a cross pattern to provide a good seal and avoid air leaks

1)Throttle cable adjustment check:
c)Carb slide MUST hit bottom
b)Test it , You MUST hear the sound of the slide hitting the bottom of the carb
c)You must have free play or slack in the throttle cable
d)You must be able to turn the throttle a small amount WITHOUT moving the carb slide

2)Make sure the carb is 100% clean, free of debris and you can see light thru both main and pilot jets

3)Double check you valve tappet adjustment .003intake and .004exh.

4)Make sure your exhaust gasket is installed properly.

5)Make sure all electrical connections are tight and you have a solid ground from the engine to the frame.

6)Check for good fuel flow and fresh fuel.

7)See our jetting guide and do a plug read.
http://www.tboltusa.com/store/tech.php?pid=61

 

Well since there is no gasket im going to start there..how big are these? Can I get one or something from an auto parts? I mean I just need something to squish down right? Then on the throttle I have like no free play and its adjusted all the way in?? Its a trc billet throttle and cable

 

you can make the gasket , sure , and i gave the throttle info ^^^^

 

Sounds like it can be electrical too, just a loose ground wire will cause popping due to misfire

 

Thats something to keep in mind..although I just got a trc outer rotor kit so its all new and I made sure the ground was contacting metal.. how do I get free play in my throttle cable? All of the adjusters are adjusted in

 

Does anyone know is it just a stock crf 50 exhaust gasket thatll work? With aftermarket exhaust

 

Is there a chance the new ignition could be bad? This thing wont run good for the life of me.... im going to check the valves and timing tonight and spark plug gap... but if those arent off I dont know where to even look... I ve got ground ive got slack in my throttle... the slide hits the bottom.... i have a new exhaust seal (idont feel or hear air coming out anymore) new gas..clean carb... it seems like there is unburned gas coming from pipe and kinda backfires gas through carb?...

 

valves! suck squeeze bang blow...sounds like the bang and blow over lap so yer on the right track

 

Is there a chance the new ignition could be bad? This thing wont run good for the life of me.... im going to check the valves and timing tonight and spark plug gap... but if those arent off I dont know where to even look... I ve got ground ive got slack in my throttle... the slide hits the bottom.... i have a new exhaust seal (idont feel or hear air coming out anymore) new gas..clean carb... it seems like there is unburned gas coming from pipe and kinda backfires gas through carb?...

If its backfiring through the carb you need to check your valve timing. May be off a tooth.

 

Thanks guys so much for all the help I didnt get around to it lastnight... I will be checking today and let you know how it goes... when I took it to the shop they were like wow this thing is acting all kinds of funny sounds like its ignition maybe valves haha(friends shop lol wasnt going to pay to get it worked on just needed a hint

 

So the timing is right....but I cant find my feeler gauge gotta get a new one tomorrow so we will see.... the other problem I dont like is I see a ton of build up on everything like old oil debris how do I clean this up? Its all over
Timing and oil build up

Timing

Old stator plate with oil build up?

 

Motor is not old, looks like it got the wrong kind of oil put in it somehow, trying to think, gear oil or something in it that went bad, smell it and see what it smells like?

 

I have drained and cycled and drained 2 times with new oil

 

I have drained and cycled and drained 2 times with new oil

From what I have seen that is sludge from lack of oil changes, or like the the above post stated, the wrong oil. Doesn't look good if it truly has only 4 hrs on it. Maybe it was run with the fish oil that these motors are shipped with when new. I have always read, the first thing you do is drain that crap out and put in real oil.

 

Yeah I wish I was the original owner from what im hearing the guy probably ran it with the fish oil

 

you need to do a compression test. with the way that thing looks inside, could be a sticky valve, or worse a burn valve. burned valve is basicaly melted on the sealing face. but a compresion test would show that right away. sticky valves are usually ok after warmed up. also, you could have a clogged exh/silencer. again, the compression test would show that prolly. if low compression, take the exh. off head and retest. expect a slight diff., but a drastic diff could show clogged silencer.
good luck.
chris

 

What compression should it be?

 

I'm no expert. But I believe 130 is a bare minimum. And 150 would be lower end of normal maybe up to 170? Do you know the method to get the compression #?

 

The method? Hook up my compression gauge and kick it?

 

yeah but from what Ive been told you kick it until it doesnt add anymore compression on the gauge. I had to kick my old 250 like 15times to get the highest reading. Im an auto tech, so its alot diff. then a car engine. where you only turn it over 3-4 times. limited experience with these dirt bikes. like I said Im no expert. lol. maybe someone else can let me know if I have that right or not. whatever it "should" be, I still think you need to find out what yours is, then find out if its normal range or not.