I'm pretty sure that the GP in the Model KGP51AT is for Gas AND Propane. I went to look at the carb to find a number.and there it was! Right above the carb, before the intake manifold was a propane mixer!! I started making a list of all the things that need some attention on the forklift and one of them was a carb rebuild. I also noticed a round hole in the top deck that didn't appear to be for any good reason. ![]() They were parallel marks where it looked like someone had cut something off with a torch. Previously, I'd noticed that there were some long cut marks in the top of the lift cover in the back. Idles smooth as a watch with excellent pick-up and power.I got some work done on the old beast yesterday, and, I found out something interesting. Installed old, use, poor looking coil to test and engine runs Spark was stronger for first 15-20 minutes of operation.Ĭoil did not get hot or even warm to touch. My guess is the spark was so weak it was just enough to allow the engine to start and run, but with increased throttle, and added fuel, the spark was simply extinguished. Wait 5 minutes, crank engine, starts back up. So I hooked #1 spark plug wire to an external plug.Īnd I hooked up a timing light to the coil wire.Īfter 2-3 minutes at idle, the engine began to run rough.I could actually see the spark on the plug hooked to #1 wire get thinner and weaker, and more orange.ģ0 seconds later, the timing light stopped functioning!ĥ seconds after that the plug stopped firing and engine quit. I started to think what else it could -possibly- be. I called the IMPCO tech dept and they said the "Vapor Fuel Hose" that connects between the regulator and mixer should be at least 5/8 ID and preferably 3/4 ID.Īnything smaller could cause the regulator to not work correctly.Īn "apparent" lean condition off idle with eventual stalling all together after a period of time, usually 15-20 minutes.ĩ5% of Carburetor problems are electrical.Īfter a run of about 20 minutes, it got rough, stumbled and died as usual. There is nothing wrong with using old equipment in my opinion, as long as it can be made to be reliable and remain low cost to operate.įor possible future reference and help in others trouble shooting adventures. ![]() In the near future, I will do the same for the Slant Six in this 1970 Yale that has been discussed in this thread, and thus will end it's ignition problems as well. Never has had any further ignition system maintenance done on it. To this day, that forklift starts and runs well on all 6 cylinders in all weather and temperature conditions. I machined the distributor, fit the old gear on the shaft and installed it in the engine with all the junk yard parts still in it (cap, rotor, module, etc). I went to the auto recyclers and got a GM HEI distributor from One day about 10+ years ago, I had enough. Seemed like it always was running intermittently on less than 6 cylinders, despite being in good tune, with carburetor rebuilt, etc. That unit always had problems that were ignition related.ĭamp conditions, cold, high humidity, etc. 20 years ago I had rebuilt that forklift nearly fromīare frame up. It's still around, as i sold it to one of the neighboringīusinesses here. I had a 1953 Yale High Cowl with a Chrysler IND30įlat head six. Here is what I intend to do to address this: I'm sure it will be an over-reaction to the problem, but Seems like there is an intermittent lean out condition going on here. Is there a diaphragm inside that can break and let in a giant vacuum leak? There is a velocity governor under the carb. Sometimes it seems rich enough and revs up crisply, and idles, then it 'goes lean', runs rough, stumbles and eventually dies after 20-30-60 seconds. Rev up, but starts a lean out trend over 20-30 seconds and then stalls. STILL does the same thing with these new parts, although, it does idle and will ![]() SO.got a new IMPCO regulator and carb, installed and mounted. Into the carb.even before the engine is running. When you turn the key 'on' the fuel solenoid clicks, and you could hear propane hissing Since I got the machine 3-4 years ago, I knew the regulator had problems because The thing would only just fire a couple times but not start up. Propane forklift started running rough and stalling, restarts got harder and longer till
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