Recommendation for High-Performance Carburetor and Reed Valve Kit Upgrade

[berk]

Go with the Nibbi brand if you can. I can say they are of stunning quality for the price. I put one on my fourwheeler, but then it decided to jump time and destroy the cam before I could fire it with the new carb.

Thanks i will Look for that

 

[ImpulseRocket]

My 2 cents. Get a genuine carb, and don't fall too much into the "bigger is better" mentality like so many do. Carb size is a very misunderstood part of engine tuning and too many people just go huge and call it a day.

Cheap PWK carbs tend to be terrible, as are cheap clone phgb carbs.

Mikuni carbs, in my experience with pretty much every carb type and size from Mikuni and Keihin, are the best running and easiest to tune. They also tend to hold their tune with changing conditions a little better. Because of the way the VM carbs function, they also tend to be more reliable even with the cheap clones.

My top three upgrades for a Phantom in no order.
1. VM-18 - mostly because it's a perfect size and can easily adapt to an OZ reed with a 23mm adapter.
2. VM-20 - will still run good, just needs more to adapt and is 20mm
3. Deloroto PHGB 19 DS - A 19.5mm bore carb. It's just a great carb. Link to a real one:

 

[Gordy]

I'm tempted to to upgrade to the VM18 due to the tunability, but I think I'll be plenty happy with the BoFeng

 

[berk]

Thanks for you reply

My 2 cents. Get a genuine carb, and don't fall too much into the "bigger is better" mentality like so many do. Carb size is a very misunderstood part of engine tuning and too many people just go huge and call it a day.

Cheap PWK carbs tend to be terrible, as are cheap clone phgb carbs.

Mikuni carbs, in my experience with pretty much every carb type and size from Mikuni and Keihin, are the best running and easiest to tune. They also tend to hold their tune with changing conditions a little better. Because of the way the VM carbs function, they also tend to be more reliable even with the cheap clones.

My top three upgrades for a Phantom in no order.
1. VM-18 - mostly because it's a perfect size and can easily adapt to an OZ reed with a 23mm adapter.
2. VM-20 - will still run good, just needs more to adapt and is 20mm
3. Deloroto PHGB 19 DS - A 19.5mm bore carb. It's just a great carb. Link to a real one:

Thanks for your reply, which carb size would be the max you would go? And is the PWK better then Mikuni?

 

[ImpulseRocket]

Thanks for you reply

Thanks for your reply, which carb size would be the max you would go? And is the PWK better then Mikuni?

For a V3 P85. With no other work done, the VM18. It complements the intake port size and port timing well. It's still a big upgrade from the 14mm Bofeng carburetor, but will still be a great size to maintain induction velocity and vacuum so the engine will be easier to tune and keep in tune.

If you are going to do some port work or plan to add a pipe, but would still run good and not get too sensitive to DA changes - a 20mm, be it the PHGB or VM. The PWK21 would fall into this category too.

I have nothing against a genuine PWK21. I highly recommend avoiding the cheap clones. What is the definition of "better" in this case? You won't see any mentionable difference in power between any of those carbs. Maybe a tiny bit of throttle response, but nothing you would notice on a single speed engine setup.

 

[berk]

For a V3 P85. With no other work done, the VM18. It complements the intake port size and port timing well. It's still a big upgrade from the 14mm Bofeng carburetor, but will still be a great size to maintain induction velocity and vacuum so the engine will be easier to tune and keep in tune.

If you are going to do some port work or plan to add a pipe, but would still run good and not get too sensitive to DA changes - a 20mm, be it the PHGB or VM. The PWK21 would fall into this category too.

I have nothing against a genuine PWK21. I highly recommend avoiding the cheap clones. What is the definition of "better" in this case? You won't see any mentionable difference in power between any of those carbs. Maybe a tiny bit of throttle response, but nothing you would notice on a single speed engine setup.

Thanks for you reply, i personally wanted to go with the PWK 21 but know i will Look, which one i could get. I'm like Finished with building the engine but the Adapter from Reed Valve broke so First i need to fix this and then im ready to go, i Had my First run on this engine for Like a few minutes and it felt really good, did i told you that my engine is from Alibaba? Im really considering If this engine is real because teh Guy told me that they are the manufactorer of this engine but enginebicycles com told me different Thing, but from Look and from the Sound it's Like the original one but dont know what to Thing about it

 

[Dogsoldier]

Since joining this forum many people have bad things to say about the HP carb. What seems to be the issues with them? This is the one with the flat slide and so called automatic choke right? My son got me my first M/B kit and a HP carb. And I haven’t had any issues with it so far, so, fill me in!

 

[Gordy]

Since joining this forum many people have bad things to say about the HP carb. What seems to be the issues with them? This is the one with the flat slide and so called automatic choke right? My son got me my first M/B kit and a HP carb. And I haven’t had any issues with it so far, so, fill me in!

They are insanely difficult to tune and have no real advantage over a BoFeng.

 

[Dogsoldier]

They are insanely difficult to tune and have no real advantage over a BoFeng.

I did have a time tuning mine, ended up with a 63 jet. But it cranks right up, runs smoothly and that auto choke is handy. It’s on a BT 100 V2 from bikeberry.

 

[Dogsoldier]

I did have a time tuning mine, ended up with a 63 jet. But it cranks right up, runs smoothly and that auto choke is handy. It’s on a BT 100 V2 from bikeberry.

Fake phantom has reached 325 miles, leaving everything stock for now, I do have a real VM-18 but just gonna leave stock right now.