Joeguy

Honestly i started to work on another quad and got it running pretty easily so now im kinda wondering if i even want to put the money and time into this one. Might keep it around as a project for later but i dont got a whole lot of free room. I did however fix my big hole in the fender with a plastic welder, i only have staples in it now but it looks alot better than zip ties.

I actually just went through this with basically the same quad and my problem was that the person before me had the white wire that goes to key switch spliced in the middle and going to some other wire instead. So ya like these guys are saying just check all wiring and atleast get power up to the key switch.

Ya if the crank is bad im just going to junk it sadly. Hopefully an easy fix.

Thanks, gona have to figure out how it all comes apart with the rear end being like part of the engine. Looks kinda simple atleast.

I been working on this thing for like 2 months now and it will not run right, is very smokey, and has a pretty loud tap that i think is in the bottom end. Not sure how much the parts are but i will put the time into it if they are pretty cheap. Im not very experienced but going off how the plug looks and the oil on top of the piston i am getting a whole lot of oil coming in from somewhere, not sure if it can come from the valves or if the rings are just shot, my cheap scope cant really see the walls of the cylinder too well. 20241009_123850.mp4

It has ran for like a minute or 2, i moved it a bit just to check if it would go into gear, but its not really ride able at the moment. I showed another guy and he agreed it looks like it was hit a while ago because there is buildup on that mark too its not fresh metal. Im reading though the manual i downloaded and re jetting the carb and stuff to get it to run good hopefully, i jsut got really worried when i saw that mark.

Well compression isnt great, my super cheap gauge says 125psi, but idk how long it has been sitting so maybe itll gain some after it runs a bit. The oil level is at the top line on the sight glass so maybe i over filled a bit. Also it is a 1991 quadrunner 250 lt4wd.

So i bought a chinese carb and in messing around still trying to get it to run right i figured id pull the spark plug to see if it was running rich, well it was definitely but also i have a nasty mark on the strap (i think thats what its called) that looks like the piston has been smacking it. I never actually pulled the plug because i had it running for a second on starter fluid when i first bought it and was just stupid and figured whatever was in there was good. The part number on it is DPR7EA, which is similar to what is called out for in the manual but i assume the little bit off that the code is means it must be a bit longer or something. Unless the plugs are made like this, but i can pretty easily see that metal has been pushed away from the area of impact. What are the odds that my piston is trashed now you think? It does still run just not well due to carb issues but thats a whole other problem. Actually i just took a second to google both plugs and it says the reach is the same its just different resistor values and gap size, so maybe the bigger gap is why its hitting. Either way the actual one for it is on the way and i hope it just didnt do to much damage. Wish i woulda just went over the whole thing like i normally do with this stuff.

Ya ill order it and then post pics of how it comes out when i get er done.

Its actually like a 8 inch oblong hole in the fender im going to try and patch with like a red harbor freight bucket to at least kinda look normal ha. Might try out that plastic welding with some extra glue to cover.

I meant saw it pumping fuel, not coming from the vac line my bad. Should have er going this weekend hopefully once this all comes in. Then i gota fix the plastics on it, you know any glues that work? I have an epoxy for thermo set plastics i was going to try.

I did replace the line as they had some tiny little thin one attached and i saw fuel when i sucked on it. Didn't do a full proper test like you are saying though i will have to go check that out when i got time for sure. Waiting on new air filter and a boot for the airbox, because i feel like tuning with no air box even connected is sorta redundant, not sure if these engines are sensitive to it but figured its a good idea either way.

Ok, long story short i basically had to re do the whole fuel and vacuum system. They had bypassed the fuel pump for some reason and that was confusing me pretty bad, thats why i was doing weird stuff with the vacuum, honestly still not 100% sure i have all the lines right because this carb is a little different than OEM it seems. Anyways now its all hooked up and i can get it to run for as long as i want with a little throttle input, so still a bit of tuning to do. Im going to put new fluids in it now that i now it will actually run. Oh and the smoking has gone away quite alot already so i figure some new gas and running it a while will fix er up. Only a few more posts then i can download the manuals and stop having to ask everything ha.

Well new carb seems to fit atleast, there is a vacuum line was not not sure what to do with but it looks like it pushes air into my gas tank to add some pressure and push fuel if that sounds right, its the one on the "back side" of the carb on the engine side not the airbox. Also is there guides on here for checking valve lash? I got alot of smoke and some of it coming from the intake so im hoping they are just out of spec and letting some exhaust come up through. Also dies after like 15 seconds of running with a high idle.

Ah my bad, it was not actually fully installed when i bought it, it just came with it. The carb was just loosely set in place not actually in the boots but the cables and fuel line were connected. My carb looks alot like one of the OEM ones but is over a quater inch longer by my measurements. Think im just going to order the similar looking aftermarket one and we shall see how its goes, atleast they dont cost a whole lot.

Yes it was on it when i got it, i figured it was the wrong one or i was just dumb and not installing it right somehow, came here to double check before buying anything.

I do believe the one with no diaphragm would fit due to where it is hitting the starter when i try to install the one i have already. I have not bought anything yet the one that doesn't fit is the old one that came with the quad, i bought it not running. Its weird to me that it wouldn't fit at all, i mean i get there are different models but you would think either would fit but just not run right. Honestly im about to just remove the starter and get this one i have in it to make sure it will run before putting more time in.

According to my VIN its an LT 4WD and there are 2 carbs that fit i guess, does the J in my VIN also mean model J for the carb? If not ill just guess with an aftermarket one and see if it will even fit.

Hello, i just bought this quad and i think the carb that came with it is either wrong or i am very dumb and cannot figure out how to install it ha. The bottom of the carb hits the wire boot on the starter before i can get it to seat into the boots, i measured it with calipers and its about 6.1 inches long. The ones that i see on ebay for it claim 5.72 inches for length, i assume that will fix my issue but just wanted to double check before buying. The carb that is in it right now has no numbers or anything on it for me to reference.