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I have a new-to-me 1988 Gl1500 that has the famous hesitation problem. I had another 1988 GL1500 many years ago and it had the same issue. Back then Honda offered a kit to fix it. I installed the kit in my first '88 and all was good.
For this bike, I ordered the 55 slow jet and a gasket set. I went through the carbs and noticed the slow jet was already a 55 but the carb control unit was the old version. Also, no X was stamped on the frame as per Honda's service bulletin. Obviously someone had been in there before trying to fix the problem.
I cleaned the carbs, checked everything, installed the new 55 jets and synched them. The hesitation was still there. I pulled them 2 more times and took them apart looking for a clogged passage or anything, no luck.
I found a set of carbs off a low-mileage '95 bike on eBay and bought them. There are few differences like a third cable connection to the throttle linkage. It looks like they will work without that 3rd cable my '88 does not have.
The big question is the vacuum lines. The '88 carbs have a total of 4 vacuum lines leaving the carbs and connecting to 2 air injection valves (hose #18 & 19). The other two hoses connect to the air valve controller (hose #16 & 17). Both the air injection and control valves are under the right fairing pocket.
The 1995 carbs have rigid plumbing with a total of 2 vacuum lines leaving the carbs. Comparing the two I see that the 2 lines on the '95 carbs match the lines going to the air injection valves (hose #18 &19).
Has anyone made this swap? If so, what did you do with the air injection controller that is supposed to have 2 vacuum lines?. Also on the '95 carb there is another line (pink) that is connected to the throttle body. Where does that one go?
Thanks.
For this bike, I ordered the 55 slow jet and a gasket set. I went through the carbs and noticed the slow jet was already a 55 but the carb control unit was the old version. Also, no X was stamped on the frame as per Honda's service bulletin. Obviously someone had been in there before trying to fix the problem.
I cleaned the carbs, checked everything, installed the new 55 jets and synched them. The hesitation was still there. I pulled them 2 more times and took them apart looking for a clogged passage or anything, no luck.
I found a set of carbs off a low-mileage '95 bike on eBay and bought them. There are few differences like a third cable connection to the throttle linkage. It looks like they will work without that 3rd cable my '88 does not have.
The big question is the vacuum lines. The '88 carbs have a total of 4 vacuum lines leaving the carbs and connecting to 2 air injection valves (hose #18 & 19). The other two hoses connect to the air valve controller (hose #16 & 17). Both the air injection and control valves are under the right fairing pocket.
The 1995 carbs have rigid plumbing with a total of 2 vacuum lines leaving the carbs. Comparing the two I see that the 2 lines on the '95 carbs match the lines going to the air injection valves (hose #18 &19).
Has anyone made this swap? If so, what did you do with the air injection controller that is supposed to have 2 vacuum lines?. Also on the '95 carb there is another line (pink) that is connected to the throttle body. Where does that one go?
Thanks.