So first time i rebuilt the carb on any of mine i had this problem. The snorkel tube and airbox have to be on. They are a slight restriction and if taken off it will cause it to run lean. You could re-jet it. But easiest fix is put it back the way the factory designed it to be. Tore it apart a dozen times swap on another carb. Ended up saying f-it for now and put it back together. Problem went away. Figured out without the airbox and snorkel tube it runs lean.
AM, Have you found the problem? I had the exact same problem. I have a 92 model. It would sit and idle like it was brand new, but when you gave it throttle it would sputter like that one is doing. Under your battery compartment hood, you will see a black box that says "main fuse/spare fuse." You're fuse is probably ok like mine was, but the wires underneath were not making good contact in the plug. That main fuse connection obviously controls spark to the plug. When I made the connection solid the engine raced on up with the throttle without the sputter. I have since cut out the Suzuki black box with the plug and installed an inline automobile fuse. It fixed it for good. I can replicate the condition by removing the fuse, or pulling the wire out of the connector. I know it sounds too easy but I would bet that is your problem.
YES! The problem was the spark pickup! It was too shallow causing it to be too far away from the stator! I stole one out of a donor quad and it fired right up! New video of the updates and progress will be out shortly! Thanks for watching!
@@AimlessMoto did you post the video of the stator/pick up replacement? I just picked one up. They are pretty cool atv high and low, its like a mini tractor. Great vid ill have to catch up on all the other bids. Thanks, I must have watched this one 4 times.
I loved the intro to your vid. Also do you think the caltrec one way bearing was weak or do you still believe it was the carb issue? I ask because my starter also turns when i use the pull cord. Just got this thing and that was the first thing i noticed.
If the starter is spinning when you pull it it is definitely the 1-way bearing, but that won't change how it runs at all. I would recommend getting a new one from Suzuki and avoiding the Caltric one. The reason the quad was running so poorly was because of a Caltric Stator... mainly the spark pickup was bad.
Hello. good evening. I'm from Portugal. i bought a suzuki quadrunner 250, 4t, from 1993. on the left side above the front wheel there is a box with two rubber menbranos inside the same box. it has two tubes that go to the carburetor and another to the engine. I notice that one of the tubes coming out of the carburetor box is not doing right. can you tell me what it might be?
Hey is it running ok yet? I,m fixing a quad runner for my son and have similar problems with one way gear, poor idle but sometimes really high idle. Takes forever when letting go of the throttle until it goes down to idle. When I bought it the guy selling told me the valves very faulty which they may be but I found that the engine was full of gasoline. That might make it run a bit strange... Think the one way gear problem might have to do with this. Anyway, looking forward to an update on this project.
The 1-way gear is only for starting on the pull starter... if your starter stays engaged while pulling on the pull-start, it's bad. The running issue was chased down to a bad spark-pickup coil from my aftermarket Caltric unit. I found a good, used Suzuki one and she runs AMAZING now, I also swapped the CV carburetor over to a Mikuni VM30, and it's really peppy!
AimlessMoto thanks for the answer, turned out there was no problem with the one way gear, it was the starter motor and the gear that connects motor to one way gear that was problematic. The case was broken so the gear didn’t sit against the starter which of course ruined it. So big problem to fix. Looking forward to a video of your progress!
No, if you watch the next video you'll see the frame stretch. I had all the plastics off so it was easier to work on. When it's done it will still have the plastics.
Nah, I figured it out after putting a test-light on the spark plug wire while it was running... the spark died at 1/4 throttle. Threw in a new pickup sensor and it works perfectly now!
the fuel pump is your problem it is spring loaded and the vac line has hard time passing the fuel i had the same problem and i fixed it by using a riding mower pump from john deer and the problem went away. here is 1 of my videos of many on the king quads 300 ua-cam.com/video/dRkqPK8Bi_8/v-deo.html is video will go into more detail about it and it shows that same mistake i made when buying that same fuel pump you did also make sure your needle is set at the half way point
So first time i rebuilt the carb on any of mine i had this problem. The snorkel tube and airbox have to be on. They are a slight restriction and if taken off it will cause it to run lean. You could re-jet it. But easiest fix is put it back the way the factory designed it to be.
Tore it apart a dozen times swap on another carb. Ended up saying f-it for now and put it back together. Problem went away. Figured out without the airbox and snorkel tube it runs lean.
3 Minutes In - Subscribed. Awesome!
Awesome! Thank you!
I miss not having snow on the ground being able to trail ride!
I see you found the issue but, a bad voltage reg can act like that as well.
AM,
Have you found the problem?
I had the exact same problem. I have a 92 model. It would sit and idle like it was brand new, but when you gave it throttle it would sputter like that one is doing.
Under your battery compartment hood, you will see a black box that says "main fuse/spare fuse." You're fuse is probably ok like mine was, but the wires underneath were not making good contact in the plug. That main fuse connection obviously controls spark to the plug. When I made the connection solid the engine raced on up with the throttle without the sputter. I have since cut out the Suzuki black box with the plug and installed an inline automobile fuse. It fixed it for good. I can replicate the condition by removing the fuse, or pulling the wire out of the connector.
I know it sounds too easy but I would bet that is your problem.
YES! The problem was the spark pickup! It was too shallow causing it to be too far away from the stator! I stole one out of a donor quad and it fired right up! New video of the updates and progress will be out shortly! Thanks for watching!
@@AimlessMoto Good deal!
@@christanya43 for me the valves were too tight, if that didn’t work
@@AimlessMoto did you post the video of the stator/pick up replacement?
I just picked one up. They are pretty cool atv high and low, its like a mini tractor.
Great vid ill have to catch up on all the other bids. Thanks, I must have watched this one 4 times.
Hi, carb problem, I suppose... ☺️
Great video!
Mines a tank only issue is to start it I have to hold it wide open and it cranks for 20 seconds til its starts.
I made a quad buggy with the same quad . I love it and was just trying to c how urs turned out
Any pics or videos?
I loved the intro to your vid. Also do you think the caltrec one way bearing was weak or do you still believe it was the carb issue? I ask because my starter also turns when i use the pull cord. Just got this thing and that was the first thing i noticed.
If the starter is spinning when you pull it it is definitely the 1-way bearing, but that won't change how it runs at all. I would recommend getting a new one from Suzuki and avoiding the Caltric one. The reason the quad was running so poorly was because of a Caltric Stator... mainly the spark pickup was bad.
Where did you get your top end parts from? i have a 2000 quad runner 2504wd I'm fixing up and cant find parts anywhere.
Ebay and Bike Bandit... the cam was from Hot Cams.
I have a suzuki 4 wheeler engine but cant find out what kind of 4 wheeler?
Hello. good evening. I'm from Portugal. i bought a suzuki quadrunner 250, 4t, from 1993. on the left side above the front wheel there is a box with two rubber menbranos inside the same box. it has two tubes that go to the carburetor and another to the engine. I notice that one of the tubes coming out of the carburetor box is not doing right. can you tell me what it might be?
That's the fuel-pump. It runs off of engine vacuum.
Got the same quad and it also had a fire🤣
Hey is it running ok yet? I,m fixing a quad runner for my son and have similar problems with one way gear, poor idle but sometimes really high idle. Takes forever when letting go of the throttle until it goes down to idle. When I bought it the guy selling told me the valves very faulty which they may be but I found that the engine was full of gasoline. That might make it run a bit strange... Think the one way gear problem might have to do with this. Anyway, looking forward to an update on this project.
The 1-way gear is only for starting on the pull starter... if your starter stays engaged while pulling on the pull-start, it's bad. The running issue was chased down to a bad spark-pickup coil from my aftermarket Caltric unit. I found a good, used Suzuki one and she runs AMAZING now, I also swapped the CV carburetor over to a Mikuni VM30, and it's really peppy!
AimlessMoto thanks for the answer, turned out there was no problem with the one way gear, it was the starter motor and the gear that connects motor to one way gear that was problematic. The case was broken so the gear didn’t sit against the starter which of course ruined it. So big problem to fix. Looking forward to a video of your progress!
do u remeber where u got the cam to got on im building and want to do a big bore and put a bigger cam
I can't remember... but if I find my info on it I'll post it up in the next video!
Did you just take off the plastics to make like a buggy
No, if you watch the next video you'll see the frame stretch. I had all the plastics off so it was easier to work on. When it's done it will still have the plastics.
Chances are, your camshaft was out of balance and your valve heads we’re out of spec
Nope, it was the spark pickup in the stator. Put a NOS Suzuki unit in and she ran like a champ.
Damnit i got ripped off i paid 120$ for one with super strong spark but it was seized and ran out of oil and has 0 compression
I gotta 2000 kingqaud and a 1999 Suzuki quadrunner 250
I have a 87 250 quadruner cdi 150 used stator 450 new go
Can I cut the wires on pickup coil n try n find 1 to wire back in
Sounds like you need to find an 80 year old that loves working on small engines
Nah, I figured it out after putting a test-light on the spark plug wire while it was running... the spark died at 1/4 throttle. Threw in a new pickup sensor and it works perfectly now!
the fuel pump is your problem it is spring loaded and the vac line has hard time passing the fuel i had the same problem and i fixed it by using a riding mower pump from john deer and the problem went away. here is 1 of my videos of many on the king quads 300 ua-cam.com/video/dRkqPK8Bi_8/v-deo.html is video will go into more detail about it and it shows that same mistake i made when buying that same fuel pump you did also make sure your needle is set at the half way point
It was the spark pickup, changed it out for the one in the spare quad and it ran perfectly.
@@AimlessMoto all right cool glad you got resolved