2021 Xpro Titan DLX

[richpiano]

Originally Posted by severely

I placed rubber caps over both the intake manifold and the head port and secured caps with a small zip tye. A small welding shop might help with the cat removal for a few bucks and let them keep the cat material as it has some value. It's better than $200 for a new headpipe. Is the carb bolted squarely on the manifold, I've seen them tightened down not flush and leak air. Good luck.

Today, I sprayed carb cleaner over my block off plate, carb and intake, including the rubber plug. No increase in idle anywhere. Now it's idling only with the choke on unless the idle screw is turned so high that it's above 2k rpms. My current main jet is a 105. My idle jet is whatever came in the VM26 clone. Could that be the culprit at least somewhat? Maybe my orange CDI box is bad?

[severely]

Originally Posted by richpiano

Today, I sprayed carb cleaner over my block off plate, carb and intake, including the rubber plug. No increase in idle anywhere. Now it's idling only with the choke on unless the idle screw is turned so high that it's above 2k rpms. My current main jet is a 105. My idle jet is whatever came in the VM26 clone. Could that be the culprit at least somewhat? Maybe my orange CDI box is bad?

How about replacing the carb with the standard one, or replacing the CDI with stock to help isolate the issue. Has your throttle slide been installed/removed? Good luck.

[richpiano]

Turns out in trying to be gentle with the brass, I had not screwed the main jet in tightly enough, and also had an air leak with the current airbox not being installed correctly.. there was a big gap between the rubber and the frame allowing air to escape around the filter! I replaced the stock filter with a pod filter (https://www.walmart.com/ip/Air-Filte...more/568302849) and if I remember correctly am currently running a 100 main with stock exhaust and stock pilot jet. I ordered what I think are the correct pilot jets after getting the wrong ones before: https://www.denniskirk.com/ebc/rd-vm...d/17339730.sku

Mine is the VM26 knockoff carb but those jets look similar: https://www.amazon.com/exec/obidos/A...5be6b7a22ce1d2

I am able to hit about 45mph but it still sputters on full throttle and doesn't want to idle. Thinking of going down a size in the main jet for top speed and ordered a 30, 35 and 40 pilot to test those to stabilize the idle. Am I on the right track?

I feel that my main jet is still a little low compared to other reports. Maybe if I replace the pilot jet I would be able to go higher on the main? Not sure if that is how it works.

[severely]

Originally Posted by richpiano

Turns out in trying to be gentle with the brass, I had not screwed the main jet in tightly enough, and also had an air leak with the current airbox not being installed correctly.. there was a big gap between the rubber and the frame allowing air to escape around the filter! I replaced the stock filter with a pod filter (https://www.walmart.com/ip/Air-Filte...more/568302849) and if I remember correctly am currently running a 100 main with stock exhaust and stock pilot jet. I ordered what I think are the correct pilot jets after getting the wrong ones before: https://www.denniskirk.com/ebc/rd-vm...d/17339730.sku

Mine is the VM26 knockoff carb but those jets look similar: https://www.amazon.com/exec/obidos/A...5be6b7a22ce1d2

I am able to hit about 45mph but it still sputters on full throttle and doesn't want to idle. Thinking of going down a size in the main jet for top speed and ordered a 30, 35 and 40 pilot to test those to stabilize the idle. Am I on the right track?

I feel that my main jet is still a little low compared to other reports. Maybe if I replace the pilot jet I would be able to go higher on the main? Not sure if that is how it works.

IMO removing the cat from the headpipe is going to make tuning the carb much easier because it doesn't matter how much air you take in if it can't be exhausted properly. I too think you're too small on the main if it's not revving to redline. Can the bike idle with a little bit of choke? If so it's an indicator your pilot jet is too low or the mixture screw is in too far in. Turn the mixture screw out a full turn and see if the situation improves idling wise, if so you need a larger pilot. The mixture screw ideally be 1 1/2 to 2 1/2 turns from bottomed to run properly but you can use the screw as a tuning guide for low speed operation. Stick with it, you're getting closer. Main and pilot jets are completely different circuits and shouldn't affect each other.