- Jun 15, 2001
- 2,552
- 0
This is an '02 R2 11.5hp S-6 L/C 4 petal case reed motor. Carb is a Dell'Orto PHBG 14MS. My son's riding a Pro Sr, and the LEM was 'loaned' out. :ohmy: Got a call that it was doing something strange. It's dying suddenly after approx. 2 minutes of vigorous riding (started happening at approx. 10 minutes (2 or 3 weeks ago) I'm told--which may or may not be important. At any rate, it was brought over--after ridden hard for a few minutes it just suddenly dies. In light of knowing little about these crazy Italian mo-chines, started with filter, plug, etc. basics. No go. Same thing. Remember that this thing is hauling when it happens. No spitting, smoke, pinging or evidence of any kind of rich or lean condition. Just bam--dies.
When trying to restart--nothing, until about 5 or 10 minutes. 2 minutes to off, 5 or 10 to on. Temperature issue? Time itself? Thinking float height or fuel line restriction issue. There seems to be no fuel filter. Furthermore, there is fuel present in the line when the death occurs. Even more, the float piece is entirely plastic and cannot possibly be adjusted. How about ignition? That becomes the hot topic. Go straight ahead and do a quick resistance check on the coil, and clean the piss out of the stator and rotor with carb cleaner. No go.
Take it back out, ride it for a few minutes, and it dies. Pull the plug wire and with screwdriver to expansion chamber, plenty, plenty, plenty of fire. Reattaching to the plug--no go. Nothing.
However, with sick curiosity and knowing it will not work because it's hotter than hell out and this thing should require leaner jetting than it ran all winter, I pull the choke lever in and kick it over. It starts, and runs, but poorly. :think:
Jetting? Needs richer jetting? It was running perfectly until recently; including through the summer.....it's running a 75 main, I think a 40'ish pilot and stock needle position. Looking at the standard setup--looks like people are running 80 mains in cold weather, 70 in hot. Therefore, I highly doubt jetting. I also cleaned all orifices from the float only side with carb cleaner and compressed air.
The only thing I haven't said, and may be the problem, is it's louder than hell. The silencer needs repacked, no doubt. Repacking material is coming. That's next. Could this alone be the problem? I have not looked at the choke or slide apparatus yet (have left carb in).
Jasle--I expect you know the answer. Get on it, man! :laugh:
BTW--I tried old jets from the KTM, but hey--why would the Italians want to make carbs with identical jet thread orifice size and pattern (KTM=PHVA 19BS)? That would mean they couldn't be duplicitous, wasting time with extra tooling costs and creating frustration for those that unfortunately bought the silly stuff. Maybe that's why they're still a small boot, and we're.....nevermind.
When trying to restart--nothing, until about 5 or 10 minutes. 2 minutes to off, 5 or 10 to on. Temperature issue? Time itself? Thinking float height or fuel line restriction issue. There seems to be no fuel filter. Furthermore, there is fuel present in the line when the death occurs. Even more, the float piece is entirely plastic and cannot possibly be adjusted. How about ignition? That becomes the hot topic. Go straight ahead and do a quick resistance check on the coil, and clean the piss out of the stator and rotor with carb cleaner. No go.
Take it back out, ride it for a few minutes, and it dies. Pull the plug wire and with screwdriver to expansion chamber, plenty, plenty, plenty of fire. Reattaching to the plug--no go. Nothing.
However, with sick curiosity and knowing it will not work because it's hotter than hell out and this thing should require leaner jetting than it ran all winter, I pull the choke lever in and kick it over. It starts, and runs, but poorly. :think:
Jetting? Needs richer jetting? It was running perfectly until recently; including through the summer.....it's running a 75 main, I think a 40'ish pilot and stock needle position. Looking at the standard setup--looks like people are running 80 mains in cold weather, 70 in hot. Therefore, I highly doubt jetting. I also cleaned all orifices from the float only side with carb cleaner and compressed air.
The only thing I haven't said, and may be the problem, is it's louder than hell. The silencer needs repacked, no doubt. Repacking material is coming. That's next. Could this alone be the problem? I have not looked at the choke or slide apparatus yet (have left carb in).
Jasle--I expect you know the answer. Get on it, man! :laugh:
BTW--I tried old jets from the KTM, but hey--why would the Italians want to make carbs with identical jet thread orifice size and pattern (KTM=PHVA 19BS)? That would mean they couldn't be duplicitous, wasting time with extra tooling costs and creating frustration for those that unfortunately bought the silly stuff. Maybe that's why they're still a small boot, and we're.....nevermind.
