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By
jmf1
in Yamaha ATV Forum
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By Jd101506
Hi all!
I've got a 1988 LT4WD that I am working on. It sat for almost two decades in a shed, so I replaced both the carb and the fuel pump (Pump was rusty, carb was ok, but had a pin hole in the bowl itself?). Now, I went el cheapo and I replaced BOTH with Chinese aftermarket Carb and Fuel pump. Now is where it gets confusing:
So I did this SAME thing on my other Quad, a 1988 LT300E. They take the same PN carb, and a similar fuel pump, (One has a 90 degree bend in the vacuum port). I've been battling the four wheeler a bit with some electrical issues, but I noticed that at idle it runs GREAT when I gravity feed fuel from a burp can into the fuel bowl of the carb... But as soon as I put it on the fuel pump from the tank, it idles EXTREMELY low and smokes a little. To me, this indicated that the carb itself was running rich. I adjusted it a little on the LT300e, but I could never seem to get it right, it still will slowly die at idle when warm, but ironically if I CHOKE the motor, it'll start up and run. I dont know if this is because the RPM increases? But the quad will run around the yard great at RPM and then die at idle.
Now, the LT4WD. I ended up with a faulty fuel pump for my second (I think the spring isn't seated inside as I can hear one rattling around) so when I installed it it WOULD NOT pump fuel. So I ended up swapping the LT300 pump onto the LT4WD. Boom, pumps fuel. I put it all back together and got my tires on. I ran it around my yard and it exhibits the SAME symptoms as the LT300e! It will run around at RPM, but it will not stay running at idle, it drops realllllly low RPM and will start smoking a little as if its running rich. Again, when I ran it with the fuel pump OFF I didn't have this issue.
In my head I'm thinking it would be a mixture screw OR float issue... But the mixture screw doesn't seem to help me on either, and the bowls are not over flowing (I checked both overflow lines). Is there something I'm missing here thats obvious? Is there a vacuum line or something I missed? Maybe some configuration or something I missed? I reviewed the manual and nothing stood out to me.
Conclusion: Two different Suzuki fourwheelers, two different carbs (Both are chinese Ebay carbs) that BOTH run well when I mainline fuel from a drip can INTO the bowls, BOTH do not keep idle and seem to run extremely rich as they run great at RPM but slowly die at idle. Adjustment screws, idle screws be damned.
I ended up ordering a new Suzuki OEM fuel pump for ~90$ just to have it and see if it makes a difference. Any advice here though would be SUPER appreciated!
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By Admin
View File 2006-2019 Bombardier BRP DS250 Shop Manual
2006-2019 Bombardier BRP DS250 Shop Manual
Submitter Admin Submitted 09/25/2023 Category Can-Am BRP ATV
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By MLG
Engine starts and idles fine. When I give it throttle it spits and back fires thru carb. I replace the carb. Replaced stator, spark plug. Check gas flow. Checked voltage 13.6, please help
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By afa913
Do the small 50cc's have a way to set the speed. Im wanting to get one for my kid and i need to set it to go slow. I know the chinese knock off fourwheelers do but i dont really want one of those
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By 97kingquad
Okay so I bought this 1997 sazuki king quad from a guy and he had it for a few years.
He had it registered and on the trails last year but he said it bogged and backfired when he would try to drive it. so it sat for a year.
I bought it for 800 bucks and got it running that night and it ran great for a few days
But I parked it the other night and went to start it again and it was really hard to fire up and when I did it was bogging and idling high then low again.
So I took the carb out and cleaned it (ended up doing it twice because it was still doing the same thing)
Now today I have it running slightly better, but it is still like 20%
I have been looking it up and trying to figure it out but I can't find the issue, has anyone else had this problem? I'll attach a video of it running and giving some throttle
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