Figured I'd pose this to the community and see if anyone has any ideas.
Ordered a new dizzy and carb from Marshall a couple months ago. Decided to install the new dizzy first, got it installed and set the timing with my old carb with the advance disconnected; it ran like a champ. Timing advanced on acceleration, all cylinders firing, had oil pressure, etc.
Installed my new carb and it fired right up; no pumping the gas and cranking the engine over or anything. I checked for vacuum leaks by misting water at all hose connections and at the base of the carb with no issues. The cruiser also immediately shut itself off when i cut off the air supply.
I let the engine get up to temperature, adjusted the idle so it sat right at 650 rpm, and checked the vacuum at this point as well; sat right at 18 psi. The engine sounded great sitting in the drive way across the RPM range and the fuel bowl stayed filled right around the halfway mark.
As soon as I got it out of the driveway, it had a really really hard time getting going. The cruiser really wanted to die as soon as I'd try to move forward, lots of misfires and sputtering, backfires through the carb, and once it got going, it would backfire through the exhaust if I needed to accelerate. I asked Marshall about it and he sent me out a new carb.
When the new carb arrived, I swapped in the high altitude jets and repeated my install procedure from above. This time the cruiser won't start without pumping the gas for about 5-10 seconds and then I have to let it run choked for 4-5 minutes before it will idle without the choke.
It's having the same problem getting going from 2 paragraphs above. If I let it idle in the driveway for 15 minutes or so, it's not nearly as bad, but it still wants to die once I get going and it backfires a lot on deceleration. I tried the paperclip trick on the
secondary rod, taken it around the block a couple times and it looks like the secondary isn't opening at all.
I can't believe that I'd have two bad carbs, so I feel like I'm doing something wrong. I feel like it's nothing related to the dizzy as it's timed correctly, advances correctly on acceleration, and each of the exhaust ports on the manifold are blazing hot after a couple minutes of idling. I fairly certain I don't have a vacuum leak as I've sprayed water and starting spray all over my connections with no change in idle.
Anyone have any ideas?
Ordered a new dizzy and carb from Marshall a couple months ago. Decided to install the new dizzy first, got it installed and set the timing with my old carb with the advance disconnected; it ran like a champ. Timing advanced on acceleration, all cylinders firing, had oil pressure, etc.
Installed my new carb and it fired right up; no pumping the gas and cranking the engine over or anything. I checked for vacuum leaks by misting water at all hose connections and at the base of the carb with no issues. The cruiser also immediately shut itself off when i cut off the air supply.
I let the engine get up to temperature, adjusted the idle so it sat right at 650 rpm, and checked the vacuum at this point as well; sat right at 18 psi. The engine sounded great sitting in the drive way across the RPM range and the fuel bowl stayed filled right around the halfway mark.
As soon as I got it out of the driveway, it had a really really hard time getting going. The cruiser really wanted to die as soon as I'd try to move forward, lots of misfires and sputtering, backfires through the carb, and once it got going, it would backfire through the exhaust if I needed to accelerate. I asked Marshall about it and he sent me out a new carb.
When the new carb arrived, I swapped in the high altitude jets and repeated my install procedure from above. This time the cruiser won't start without pumping the gas for about 5-10 seconds and then I have to let it run choked for 4-5 minutes before it will idle without the choke.
It's having the same problem getting going from 2 paragraphs above. If I let it idle in the driveway for 15 minutes or so, it's not nearly as bad, but it still wants to die once I get going and it backfires a lot on deceleration. I tried the paperclip trick on the
secondary rod, taken it around the block a couple times and it looks like the secondary isn't opening at all.
I can't believe that I'd have two bad carbs, so I feel like I'm doing something wrong. I feel like it's nothing related to the dizzy as it's timed correctly, advances correctly on acceleration, and each of the exhaust ports on the manifold are blazing hot after a couple minutes of idling. I fairly certain I don't have a vacuum leak as I've sprayed water and starting spray all over my connections with no change in idle.
Anyone have any ideas?
