Gravelroad
Hero member
- Location
- Central Europe
Being a seasoned 2-stroke rider, my first attempt in this case would have been replacing the plug of the cylinder not firing. As already mentioned, they may have nice spark only when operated outside the engine.
Did the plug of the failing cylinder get wet during your attempts to get it running properly?
Assuming a blocked idle system, any attempt to clean it properly w/o taking the carbies off is futile. :-* Narrowest part of the system is the small orifice running from the mixture screw directly into the throat at engine side. Pushing from the wrong side will only result in finally clogging it up with dirt in most cases.
IMHO the most nasty dirt trap in the idle system on many Dellortos, including the PHFs, is the hole where the mixture screw sits in. >
PITA to clean out properly. On the worst Dello I had, any attempts by ultrasonic, carb cleaner and compressed air had failed in getting it's idle circuit back to reasonable work. Shortly before throwing the sucker into the bin, I resorted to a single strand of copper wire (grind your axes here), to carefully scrape out some tiny flakes of dirt from that place. I did this outside in the bright sun, to shine some light into that hole. It's dark in there...and the little hole where the screw tip goes in should better not be touched by the wire. :
After this being done, the idle circuit of that little troublemaker was working perfectly well again.
Even the tiniest bit of dirt in these holes will create trouble, keep this in mind when putting the mixture screw back in after cleaning.
Would recommend to drain the float bowls when laying up the bike for long periods, they are selling shit fuels these days.
Did the plug of the failing cylinder get wet during your attempts to get it running properly?
Assuming a blocked idle system, any attempt to clean it properly w/o taking the carbies off is futile. :-* Narrowest part of the system is the small orifice running from the mixture screw directly into the throat at engine side. Pushing from the wrong side will only result in finally clogging it up with dirt in most cases.
IMHO the most nasty dirt trap in the idle system on many Dellortos, including the PHFs, is the hole where the mixture screw sits in. >
PITA to clean out properly. On the worst Dello I had, any attempts by ultrasonic, carb cleaner and compressed air had failed in getting it's idle circuit back to reasonable work. Shortly before throwing the sucker into the bin, I resorted to a single strand of copper wire (grind your axes here), to carefully scrape out some tiny flakes of dirt from that place. I did this outside in the bright sun, to shine some light into that hole. It's dark in there...and the little hole where the screw tip goes in should better not be touched by the wire. :
After this being done, the idle circuit of that little troublemaker was working perfectly well again. Even the tiniest bit of dirt in these holes will create trouble, keep this in mind when putting the mixture screw back in after cleaning.
Would recommend to drain the float bowls when laying up the bike for long periods, they are selling shit fuels these days.
