DuncanV
Member
Hi Guys, I'm new to this forum and seeking advice. I have been through the Carb thread but not found a definitive answer so the mods can redirect my questions if necessary.
I have a GL1000 trike conversion I have done myself and it has run fairly well for 4 years since I did the conversion, mileage is 77k and mechanically it is sound. It was always very thirsty (25mpg), and the previous owner confirmed it when I met him at a show. It also rattled at idle and even though the carbs were balanced to perfection I deceided to convert to single carb using the existing plenum and fabricated inlet tubes.
The carb is a 32/34 DMTL Weber (NOS) which is about as simple as a Weber can be, no auto choke, no solenoids, blanked off vacuum pipes and mechanical second choke so as not to cloud the issue. It sits atop the plenum with a 10mm adaptor plate with no need to cut the frame or any other mods.
The bike starts well on the choke and revs well, as smooth as can be BUT only over 3k. As soon as it dip below 3K it need to be revived with a few pumps of the accelerator pump and so it goes on. The pilot jet is a 50 and the main jet is 120 in both barrels of the carb. The primary of the OEM carbs is 65 so I wondered if this is the problem as only one (small), jet is not supplying enough gas to, now, all four cylinders.
There are no air leaks and the fuel pump can clearly supply enough for 3k+ running. The cutoff is quite distinct and it could be the changeover between pilot and main jet but I don't have any useful carb information. If anyone has any thoughts on the problem I would be glad to hear it, it is disappointing to me as the conversion and the theory behind it is all good and I don't want a fire breathing dragon, (I have a Buell and Ducati Monster for that!!), I just want a reliable and economical engine
I have a GL1000 trike conversion I have done myself and it has run fairly well for 4 years since I did the conversion, mileage is 77k and mechanically it is sound. It was always very thirsty (25mpg), and the previous owner confirmed it when I met him at a show. It also rattled at idle and even though the carbs were balanced to perfection I deceided to convert to single carb using the existing plenum and fabricated inlet tubes.
The carb is a 32/34 DMTL Weber (NOS) which is about as simple as a Weber can be, no auto choke, no solenoids, blanked off vacuum pipes and mechanical second choke so as not to cloud the issue. It sits atop the plenum with a 10mm adaptor plate with no need to cut the frame or any other mods.
The bike starts well on the choke and revs well, as smooth as can be BUT only over 3k. As soon as it dip below 3K it need to be revived with a few pumps of the accelerator pump and so it goes on. The pilot jet is a 50 and the main jet is 120 in both barrels of the carb. The primary of the OEM carbs is 65 so I wondered if this is the problem as only one (small), jet is not supplying enough gas to, now, all four cylinders.
There are no air leaks and the fuel pump can clearly supply enough for 3k+ running. The cutoff is quite distinct and it could be the changeover between pilot and main jet but I don't have any useful carb information. If anyone has any thoughts on the problem I would be glad to hear it, it is disappointing to me as the conversion and the theory behind it is all good and I don't want a fire breathing dragon, (I have a Buell and Ducati Monster for that!!), I just want a reliable and economical engine