I know I started another thread about a month ago, but I'm still having problems with the bike. It's a 94 Suzuki Quadrunner 250, air cooled. Anyway about a month ago we used it to tow a 03 Prairie that was down, and it ended up overheating bad. We had difficulty getting it started so we took it to an ATV shop a week after. They just adjusted the idle and it turned on, which was cool since we though it would be more expensive. So last weekend my cousin turned it on drove it for about 10-15 minutes and it completely died once warmed up and would not start. We're just wondering what type of damage could be done? Any ideas or suggestions are greatly appreciated. The bike is in mint condition, so it's a shame if it's done. I think we might take it to a Suzuki dealership in a last attempt, but I can't see it turning out good.
mine does not always like to run once warmed up and i constantly adjust the idle as the bike warms up. If it cranks cold I seriously doubt it is damaged beyond what can be ridden. If all the shop did was adjust the idle you may want to change the oil as heat is a big enemy of oil. Also double check the valve to rocker clearance and put in a new spark plug. Actually I would probably put my money on your intake valve does not have enough clearance as I just did a valve job on mine and that was one of the problems I was having. As for overheating I ran mine so hard in a mud hole about a month ago that when I looked down the header pipe was glowing red for about 6 inches out of the head. It still runs great today. anyway, good luck
mine does not always like to run once warmed up and i constantly adjust the idle as the bike warms up. If it cranks cold I seriously doubt it is damaged beyond what can be ridden. If all the shop did was adjust the idle you may want to change the oil as heat is a big enemy of oil. Also double check the valve to rocker clearance and put in a new spark plug. Actually I would probably put my money on your intake valve does not have enough clearance as I just did a valve job on mine and that was one of the problems I was having. As for overheating I ran mine so hard in a mud hole about a month ago that when I looked down the header pipe was glowing red for about 6 inches out of the head. It still runs great today. anyway, good luck
How hard is to do the valve clearance adjustment on this bike? I understand the concept of it, i'm just wondering if it's too difficult. I might try the oil, but as I said before the bike did start after that incident, so hopefully it's still good.
Take off the valve caps They're 17 MM, And since they are aluminum, they've always rounded off on every one I ever took out. They are so tight, that I've had to chisel them out befor. Just take a really sharp pointed chisel, and make sure it digs into the aluminum, then start hitting it with a hammer. It usually works. After you get them out, Just tighten them with vice grips, or something easy, and put silicone on the threads. That way you wont have problems getting them back loose. Dont worry about tightness, The silicone works like threadlocker when it hardens, but doesent over-do-it to the point you cant get them back out, Then, you can just start turning the adjuster nuts, Turn them until they have no slack (You cant wiggle the rocker arms) Then back them out just enough so that they wiggle. Thats how i've always adjusted mine, on my honda, two yamaha's arctic cat, and now my suzuki. They always run fine. I hope you get-er-runnin!
the exhaust valve cap is easy to get to and when you take it out will drop a little oil. As for the intake make sure you have about an 8-10 inch extension on a 3/8 ratchet. Pull the seat off and there is a hole you can put everything through on cross member of the frame. then i think a 10mm socket loosens the lock nut, and a flat blade stub nose screw driver the adjustment screw. Adjust the intake valve to the point that it just barely has slack as the tolerance is .001-.003" while I adjust the intake I make it a point to pull the pull rope several times always double checking the clearance several times. If i get my intake clearance to loose the machine makes alot of rocker noise and is very annoying. It took a few tries but I did get it to point I could stand a little rocker noise and that there was not to much slack. As for the exhaust clearance make it about double the slack of the intake and you will be fine. I don't worry about feeler gauges as it is to difficult to get them in there. Mine has held that adjustment since I did the valve job about 150 miles ago.
Now after you do the valve adjustment hope that the quad does not start stalling out after warming up again. If so and the intake valve has no clearance again you are eating up your intake valve and will have to replace it. you can adjust the clearance but you will be doing so every 30-40 miles and sooner or later you will run out of room to adjust.
Anyway good luck and i will check this post more often to help you out. If you have to feel free to send a pm or email.
94 Quadrunner 250 turns off after warm up
