Thanks man 👍. It usually does take me more time to edit the videos than to do the actual work lol, but it is fun to see it all come together and paint the picture of the results. Thanks again and all the best !

Thanks man 👍. Yep, for me, I’ll be sticking with the dual carbs since, like you said, once to get the process down to sync them, they perform really well. From the testing, the motor seemed so much happier and the throttle was much smoother with the dual carbs for sure. If someone was wanting to get that extra lower rpm torque, the dual carbs can easily be fitted with air pods and the jets increased to compensate for the extra air and you get the same result along with the stability of the dual carbs. I set my Bobber up this way with the stock dual carbs and it pulls like a horse and I still can tune each cylinder for the best performance. Thanks again and all the best ! Steve

Thanks ! It was interesting to see how the single carbs did vs. the stock dual ones for sure. Finally settles it in my mind that properly adjusted duals make the two cylinders work together much better. I will have to say that pulling a single carb off is a ton easier than pulling off the duals so if I ever find the right manifold design that balanced the two cylinders it would be the best of both worlds 👍. Thanks again and all the best ! Steve.

Hey again, yep, it becomes even more obvious with the equal runner for the imbalance for sure…a bit opposite to what I was imagining, but none the less made for a good test as it further confirms how much the cylinder firing comes into play. In thinking about it a bit more after the testing, since these are wasted spark ignitions, I should be able to change the front cylinder’s timing (basically 180 out from normal), and have both cylinders fire on the same rotation. Might not run very well (who knows till we try, lol !), but it should show a difference in the lean or rich condition compared to the normal timing. I might experiment with different runner lengths just to see if one can be made, but the biggest thing for me was the confirmation that running dual carbs is much better for balancing since each can be adjusted and are independent 👍

Yep, definitely seems to make a difference 👍. Probably with a few trials, the correct lengths could be found that would balance the two cylinders I would think

Thanks man 👍. Yep, for me, the dual carbs are the way to go as well since each cylinder can be optimized. I don’t mind them either for adjusting and sync’ing (but I’ll admit I don’t like having to take them off so much, lol !). I’ll have to say that if someone wasn’t good at dealing with the duals and getting them adjusted correctly, a properly jetted single with a well designed manifold should work better than poorly tuned duals.

Thanks man 👍. Yep, if I was planning to replace my stock 1st Gen dual carbs with newer ones (of if someone was swapping to a single carb with a manifold), I would pick the type with the acceleration pumps (thus the name “pumper carb”) so when the throttle is opened to accelerate, the little pumper circuit adds extra fuel just as the throttle is opened to smooth out the initial acceleration. This would keep the AFR from going lean just as the throttles were opened like what I saw in the testing. I believe the 2nd Gen Virago Mikuni carbs are the pumper type so I’d probably grab a set of them if I was swapping as they would be direct fit to the cylinders. For just a single pumper type carb for a single carb manifold, there are many available in the 36 mm to 38 mm range that have the accelerator pump built in…I haven’t looked for any though so I’m not sure which ones would be the best to choose. Thanks again and all the best !

👍. Yep, it would be interesting to try some more modern carbs to see how they compare. After the testing, I was thinking that the 40mm Hitachis may be a bit too big in the throat so the smaller diameter runners may be messing up the air and fuel flow. At least seeing that the equal length runner one made things worse, that says that there much be a good unequal dimension that would balance the two cylinders. I still haven’t given up on finding out why the cylinders act differently, but that’s gonna take some more testing lol !

That would be pretty interesting since those have the air chamber in the middle that might help to balance things out 👍. Maybe they will see the video and send me one to compare as it would be some good comparison testing for them 😃

Hey man ! I’m actually not sure where he sells them from as he contacted me from the “Virago Nation- All things Yamaha Virago” Facebook forum to see if I wanted to test the ones he designed. If you have Facebook, hop out on the forum as he has his messaging setup (which is how he contacted me). If not, let me know and I’ll message him to see if he can provide a link 👍.

Hey man ! Yep, not really sure either as there seems to be quite a bit going on inside the manifold if the design differences affect the results so much.

Hey ! Yep, I was hoping he would start making them again soon, but seems he hasn’t restarted yet. I was hoping to get my hands on a couple more from different manufacturers and compare them into it so I need to keep this one for a while longer unfortunately

@@StevesDIYs Meanie

Hey ! It’s an Innovate brand. Here’s a link to another video I did on tips for setting it up on the test motor if interested: Innovate Dual Air/Fuel Ratio Gage Kit - Waste of Money or Worth it ?!?! kzfaq.info/get/bejne/Y-CKZKyGnsfXYqs.html

Thanks for the reply. I'm putting a single carb on my son's six hundred shadow . Just don't want to ruin the motor.

Hey man ! No, I’m a pretty good ways away in Nashville TN.

@@StevesDIYs hey bro awesome work you're amazing!!

@@karlh4313 thanks man 👍. It was a fun experiment indeed !

@@StevesDIYs thank you for all you do!!