Running issues Got new carb

[300rman]

we,,, it seems no matter what i do with anything, i CANNOT get the midrange rpm's right. it always bogs/sputters. the top end is insane, and it idles fine all day long. i think part of the problem is the needle. the needle does NOT anchor in the slide, so it can move independently of what the slide does.
i have actually had the needle pop out if the slide and act as a throttle limiter, wedging itself between the slide and the top of the carb, not letting me past like 1/8 throttle.........requiring me to tear it to pieces to put hte needle back into the slide.
so, im think im going to get a Kehin carb as soon as i get the money.
also, sometimes after riding awhile, it will just shut off, like it flooded out.

also, when just setting there, gas will randomly leak out of the overflow tubes, then stop again, when it is NOT running, setting on flat level ground.

now, the plug is black, but it still seems to run hot. it runs around 330 degrees plus.........which in all my motor experience is WAY TOO HOT i think?




and it all of a sudden started "kicking back"
almost EVERY TIME i kick it, the kicker ROCKETS back the other way(or tries to)
it REALLY HURTS. before today (riding about 4 hours) it RARELY did this....now it does it almost EVERY KICK.

so, my questions are:
1. what should be a good operating temp range for this motor?
2. Why would the kicker start kicking back all-a sudden?
3. How to set timing on the thing? perfect is not needed, but something close, after it gets real hot, it seems to make a knock occasionally, but only one knock.
4. What should i check for this bogging/sputering? tried every needle clip, nothing really seems to make it better. top end seems OK.



still have no idea what is causing it to kick back. could it be the timing i wonder?

[bigreddaddy]

Do you have the spring in the slide that holds the clip and the needle down? How the heck is your needle popping out?

[Erics350x]

though i have no idea what type bike we're talking about, it sounds like a 4 stroke honda (if i sound like a A-hole i wasn't trying to). Try checking out the compression release, make sure it moves during the first part of moving the kicker.

[RedRider_AK]

Sounds like the little tab in your throttle slide is missing. There's a washer type deal that keeps your needle in place, and if your needle pops out on it's own, I'm GUESSING that you might have a slight problem.

[ceaserthethird]

Buy a Carb Rebuild Kit , $15 bucks ...

Swap in a new plug , buy some Main jett's

[ceaserthethird]

O most for got -

MAke , Model , year & any mods ?



:postwhore

[300rman]

oshat my bad......
i am Nightbiker07, my account is being broken, so i had to create a new one temporarily......

its a 84 250r with a 300 kit, power reeds, wiseco piston, DG exhaust.......

the main jet seems about right, the top end is great. it will only get to the top end if you hammer the throttle...midrange is nonexistent.

and 300some degrees seems way too hot for a running temp. i am thinking its lean or something in the midrange, even though the plugs get black. i am usualy running it in the midrange (riden 4 strokes my whole life, not used to the pegged motor idea yet.

and yes, it does seem something is missing to hold the needle in place. i am just going to get a kehin, most of the people i talk to are more knowledgable with them anyways.

so about the timing? i want to set it somewhere near a factory setting. i know it might not make a power diference, but idk. i want to eliminate possibilities here.

[300rman]

well, ordered a keihin 38mm carb :D

what would cause the kicker to all of a sudden start kicking back? and i mean HARD.

[bigreddaddy]

What is your compression reading?

[300rman]

compression is a ?.

i took the motor to PR racing to get the topend worked on, the piston did not come anywhere near the top of the cylinder. they machined the jug and assembled it, so i ASSUME it is where it should be. i can check it this weekend.

but it didnt do this kickback always....it started doing it after about 5 hours of riding.

[300rman]

could the timing be causing the kickback? its going to break my foot if it keeps it up. i just dont get why it would suddenly start doing it.

[threewheelin-feelin]

when i rebuilt a 350x a couple years ago the timeing was off and it has a bad kickback but it may be different on 2 strokes

[300rman]

how would i go about checking /adjusting the timing on this thing?
i know the concept, but i dont see how you can adjust it, unless you guess and check. is that the only way, or is there a simpler solution?

[NINJA]

What's wrong with your account dude? Did you get banned or something?

[rally4x4racer]

you are really confusing me about the timing. How could you adjust the timing on a 2 stroke? advance the cdi? Are you going to move the intake or exhaust ports?

[ceaserthethird]

Let's get this Straight - No Timming Adjustments - for the 250R

Unless you drill the mounting bracket ... but i don't know the Full Details ....

Kickback should be caused by Compression - for the 2 Strokes

[jason 32]

yea you can widen the stater mount holes a lil ,and will advance or retard the timing-

it sounds like its predetonating because its getting too hot-
fix the carb, set the timing--check the plug size,and the gap-

the carb is suppose to have a needle holder to keep the jet needle in place-
this is one problem- you don't have it- this is dangerous

[james9r9r]

Take it to the SHOP:)

[Erics350x]

Check the woodruff key in the flywheel it could be bent or starting to sheer

[300rman]

billy thinks its corrupted...as soon as i log in, i cant view anything.

taking it to the shop is out of the question. i am capable of fixing it IF i know what to look for. my car came out of a junkyard for gods sake :P it was a wrecked total.

the stator is slotted, and can be rotated about an inch from end of slot to end of slot, which, would count as a timing adjustment, correct? it soesnt look like it has been cut to make this adjustment possible, so it could be an aftermarket stator.

i will check the key when i get a chance. i mean, that is the only thing that makes sense, as it literally suddenly started doing it.......started it, drove it across the yard, shut it off. went to restart and about got shot into the stratosphere.......and it does it almost every time i kick it. if i really WAIL IT it will start, and seem to run fine, minus the carb issues.

[bigreddaddy]

went to restart and about got shot into the stratosphere.......


LOL. What year 250r do you have?

[300rman]

84 with a 300 kit

[Rustytinhorn]

When I first got my '85, the midrange was suffering big time. Turns out it was a combination of a lot of things. 2 stokes are extremely, extremely, and once more: extremely tempermental as far as jetting goes.
Some things that might help improve mid response is:
Clean Clean Clean carb
New spark plug-gives you a strong spark
Purged exhaust system-allows better airflow
Clean or new air filter-try running it BRIEFLY without the air filter and see if response improves. It doesn't take much to clog a filter.
Good quality gas- I found this makes a HUGE difference. Gas from one station can drastically effect perfomance compared to another station. Once i found a station I liked, I stuck with it. Before I go on any trip I will stock up on gas from the one station and run it the whole trip instead of buying some here and some there.
Correct oil/fuel mix ratio to go along with jetting.
Jetting-in general, the more mods you have the more jetting work needs to be done. I spent over half a year finding the correct combination of idle jet, main jet, clip position, idle/air screw, and float level before I was finally able to "clean" the performance out to where I was satisfied with it.
I dont know how to check timing on the 84. As far as I know they are not adjustable. Check your Clymer manual, it will tell you how to check it.
Along with jets there are different needles you can order. I found my midrange tends to run the richest.
My 85 will kickback. It scares the snott outta me when it does, and it hurts bad too. I've learned to kick it quick, and get my foot the heck outa the way once its down. I think the kickback might come from kicking it too slow.
In short, check all the misc items (air filter, spark plug, good electrical, good gas) and once you have all those variables out of the way then you can start on your jetting journey.
For leaking carbs, get a new needle seat valve. Those are kinda a common thing to replace on any used bike. The other thing would be the floats. If I let mine sit with the gas left on, it will start leaking after a few minutes. I just remember to turn the gas off when I'm not riding it.
As far as overheating goes on an air-cooled cylinder..um....what oil viscosity are you running? Might be too thin for the hot weather.
Hope my book helped.
Rusty

[300rman]

great post rusty!
oil viscosity? in the tranny case? im using valvoline 10w40. manual says to use it.
and when it was giving me trouble, it was cold outside :/

found the kickback issue. the keyway on the flywheel sheared......cant believe the stupid thing still ran. put a new one in, good to go!

the midrange problem is definitely not "because its a 2 stroke" because before the 300 kit, it had a real good midrange. im pretty sure its a jetting issue. i bought a 38mm keihin PK, and plan to work with that one.

[Erics350x]

great post rusty!
oil viscosity? in the tranny case? im using valvoline 10w40. manual says to use it.
and when it was giving me trouble, it was cold outside :/

found the kickback issue. the keyway on the flywheel sheared......cant believe the stupid thing still ran. put a new one in, good to go!

the midrange problem is definitely not "because its a 2 stroke" because before the 300 kit, it had a real good midrange. im pretty sure its a jetting issue. i bought a 38mm keihin PK, and plan to work with that one.

AH HA i was right for once. lol
Torque down that flywheel bolt good and use alittle loctite or you'll have the same problem again soon.

[300rman]

its as tight as it can be got for now. the threads on the shaft are F'd up (never take anything to the shop for general stuff....machine work ONLY)

i need to thread the shaft with a different thread, on a slightly smaller diameter.
itis tight, but i think it sheared off from running so horribly.

[Russell 350X]

great post rusty!
oil viscosity? in the tranny case? im using valvoline 10w40. manual says to use it.
and when it was giving me trouble, it was cold outside :/

found the kickback issue. the keyway on the flywheel sheared......cant believe the stupid thing still ran. put a new one in, good to go!

the midrange problem is definitely not "because its a 2 stroke" because before the 300 kit, it had a real good midrange. im pretty sure its a jetting issue. i bought a 38mm keihin PK, and plan to work with that one.

Air cooled R's are known for getting to hot when a big bore kit is put on them. Where do you ride and what kind of riding do you do?

[300rman]

i dont ride too hard, trails/yard beating mostly.
Toledo ohio area, and right now, its cold outside, so its not the atmospheric pressure doing it.

[Rustytinhorn]

Glad you found the kickback problem. Hopefully the new carb and jetting will work out for you. You will definitally pump some power with a 300 kit I would think.

[300rman]

well, i got my 38mm Keihin off a cr500 from Ebay.
and WHADDYA KNOW?
it rid me of the NEVER START problem without a gallon of starting fluid...now is a 2 kicker.
rid me of the midrange Bogging that Plagued it.
AND, it seems to be jetted perfectly, as the motor runs at about the same temp as the blaster, AND the plug is a nice Mocha color!

PISS ON MIKUNI!
ive used 2 keihin carbs for a custom ride, an 1 mikuni. and both keihins rocked this world, but the mikuni sucked A$$HOLIO

[Mosh]

well, i got my 38mm Keihin off a cr500 from Ebay.
and WHADDYA KNOW?
it rid me of the NEVER START problem without a gallon of starting fluid...now is a 2 kicker.
rid me of the midrange Bogging that Plagued it.
AND, it seems to be jetted perfectly, as the motor runs at about the same temp as the blaster, AND the plug is a nice Mocha color!

PISS ON MIKUNI!
ive used 2 keihin carbs for a custom ride, an 1 mikuni. and both keihins rocked this world, but the mikuni sucked A$$HOLIO
Didnt another member tell you to do this like 2 months ago?:confused:

Well at least you updated the post with a fix.

[300rman]

nah, he said in the beginning of this thread to get a keihin.