Which carbs are for me?

[RIPRuck]

My banshee is down right now due to a blown rod bearing and have been accumilating parts to upgrade. Other than the items listed in my sig I've decided to go with an aggressive trail port, hot-rods crank trued/weld(stock length rods), 20cc domes, lightned flywheel and weisco pro-lites. I was told to go with larger carbs but not sure what ones to go with. I ride mostly trails at the moment.. Will I see a big difference with the port job and larger carbs? I already know the port job will wake it up but whats your thoughts on carbs?

 

I also live in New England which means rejetting frequently is a must so I'm looking for a set that is easy to tune.

[jmd0346]

My banshee is down right now due to a blown rod bearing and have been accumilating parts to upgrade. Other than the items listed in my sig I've decided to go with an aggressive trail port, hot-rods crank trued/weld(stock length rods), 20cc domes, lightned flywheel and weisco pro-lites. I was told to go with larger carbs but not sure what ones to go with. I ride mostly trails at the moment.. Will I see a big difference with the port job and larger carbs? I already know the port job will wake it up but whats your thoughts on carbs?

 

I also live in New England which means rejetting frequently is a must so I'm looking for a set that is easy to tune.

 

 

 

 

Id go with the 30mm OKO's. They're a keihin knockoff. They can be bought at Carbpartswarehouse.com.

[locogato11283]

keihin 33mm pwk. call FAST. 1 785 364 5325. jeff will get you set up.

[RIPRuck]

keihin 33mm pwk. call FAST. 1 785 364 5325. jeff will get you set up.

 

 

Any reason the 33mm over any of the others? Just to get familiar..

[Snopczynski]

your a prime cadidate for a 2 into 1 intake with a 35mm pwk.

[locogato11283]

Any reason the 33mm over any of the others? Just to get familiar..

well the 33's are a good carb. they arent too big but will increase performance on the top end. they will work nicely with your trail port. my brother had a similar setup. plus, if you ever decide to go to a 4mm motor youll already have a carb big enough for that. these carbs are also very easy to jet. a lot of people here use them and can help get you tuned in properly. i really recommend them. youll have to get some new intakes to run them. thats why i said call FAST. jeff will have everything you need in one phone call..

 

your a prime cadidate for a 2 into 1 intake with a 35mm pwk.

single carb setups will never make the power dual carbs can. honestly, i see no point in running single setups on a twin cylinder motor. his bike is going to have tons of low end after his porting is done. he would benefit more from a carb setup that will bring back some of his top end..

[odaen]

My banshee is down right now due to a blown rod bearing and have been accumilating parts to upgrade. Other than the items listed in my sig I've decided to go with an aggressive trail port, hot-rods crank trued/weld(stock length rods), 20cc domes, lightned flywheel and weisco pro-lites. I was told to go with larger carbs but not sure what ones to go with. I ride mostly trails at the moment.. Will I see a big difference with the port job and larger carbs? I already know the port job will wake it up but whats your thoughts on carbs?

 

I also live in New England which means rejetting frequently is a must so I'm looking for a set that is easy to tune.

 

I'd say stick with your stockers(can get them bored to 27.5mm), or go with some 28pwk's or the 30 oko's (clone of the 28pwk). You will lose more throttle response and bottom end torque the bigger the carb you go.

[Snopczynski]

Single carb especially on a mx or woods port works just as good if not better than a set of twins. Its super easy to tune, and you only have to buy parts for 1 carb. Its right up his alley. :biggrin:

 

I have stated this many times, I know a ton of dune and trail bikes that run a single carb intake and they are fast, fun, and reliable setups.

[RZBansheeMan]

A pair of 30 - 33 PWK's are gonna net you the most mid to top power from your set up at the expense of having 2 carbs to buy and tune.

 

A single 35 PWK is going to be a real good bottom to mid set up with a slightly less top end, and there might be some savings there. The single is also gonna be much easier to work on and or much easier on your thumb.

[locogato11283]

I'd say stick with your stockers(can get them bored to 27.5mm), or go with some 28pwk's or the 30 oko's (clone of the 28pwk). You will lose more throttle response and bottom end torque the bigger the carb you go.

i would stick with stockers over going to 28mm.. theres really no point in that. but in his particular situation of doing the trail port, hes not gonna need any more bottom end. he'd be better off with the bigger carbs, gaining some of his top end back. the bike will be strong all around. my brother had a very similar setup and it was a monster off the line and ran hard on top...

 

A pair of 30 - 33 PWK's are gonna net you the most mid to top power from your set up at the expense of having 2 carbs to buy and tune.

 

A single 35 PWK is going to be a real good bottom to mid set up with a slightly less top end, and there might be some savings there. The single is also gonna be much easier to work on and or much easier on your thumb.

cutting a few loops off the springs makes the carbs a lot easier to work with. the thumb doesnt get nearly as tired. again, i dont see him needing anymore bottom end power. hes gonna need more back on top.

[RZBansheeMan]

I agree. IMO a banshee should be treated as a twin with twin carbs and twin pipes.

[Snopczynski]

Top end end gains to be had with dual carbs compared to a single carb setup with a low-mid port job and pipes to compliment will be minimal if not existent. The pipes you run with this setup will peak at 9k rpm best case scenario, the 2 into 1 carb will work the same as a set of duals at this rpm.

 

There is no top end to gain on a low-mid motor by switching to dual carbs. Not to mention there are not a whole lot of guys on here that have experimented with building a bottom end power oriented bike to ride. So your speaking from experience then right? You had a mx or woods port job and ran both intake setups on the same dyno and did before and after mod runs right? In my opinion the more bottom end, the funner the damn thing is to ride. I have a lightly ported engine with all bolt on low-mid parts and the bike runs dead even on the hill with a fully ported drag 350 engine with cpi pipes and dual 35mm pwk carbs. So, at the end of the day when I whomp on his ass in the holes and they stay next to him on the hill, he just kicks himself for spending all that money on a bike that he can only ride in a straight line with and not even do that really well next to the little bike with 1 carb, and 1 pipe on it.

[odaen]

Top end end gains to be had with dual carbs compared to a single carb setup with a low-mid port job and pipes to compliment will be minimal if not existent. The pipes you run with this setup will peak at 9k rpm best case scenario, the 2 into 1 carb will work the same as a set of duals at this rpm.

 

There is no top end to gain on a low-mid motor by switching to dual carbs. Not to mention there are not a whole lot of guys on here that have experimented with building a bottom end power oriented bike to ride. So your speaking from experience then right? You had a mx or woods port job and ran both intake setups on the same dyno and did before and after mod runs right? In my opinion the more bottom end, the funner the damn thing is to ride. I have a lightly ported engine with all bolt on low-mid parts and the bike runs dead even on the hill with a fully ported drag 350 engine with cpi pipes and dual 35mm pwk carbs. So, at the end of the day when I whomp on his ass in the holes and they stay next to him on the hill, he just kicks himself for spending all that money on a bike that he can only ride in a straight line with and not even do that really well next to the little bike with 1 carb, and 1 pipe on it.

 

The single carb setup seems to be a love it or hate it kinda deal. More times than not though, I've heard of people taking them off to go back to dual carbs. Maybe they just don't have the experience with them to set them up properly. The jetting is quite a bit different than dual carbs and far less people run them, so, I dunno. Personally, I like the idea. One carb to setup and jet, no sync'ing necessary, etc.

 

However, if your trail bike is kicking his drag bike's ass, I'd say it has very little to do with his 35mm dual carbs vs your single carb, and much more to do with gearing/paddle/rider ability than anything else.

[jbooker82]

I would run PWK33's Not to big not to small. They are a good all around carb.

[Snopczynski]

The point here is that you can build a very fast trail bike using what everyone considers to be bottom end parts and it will still keep up with a top end built bike. There is nothing wrong with this guys bike, it runs rather well, my bike is built to do what I want it to do. I spent some time on the dyno and put parts on it that made a difference and made it quick. I actually took some parts off that didn't do much (reed spacers).

 

If you go with twins on a trail bike I recommend pwk 28's or mikuni tm 28's. Max absolute size I would go on a stock stroke banshee is 32mm, but I dont recommend those for this bike. What has to be realized here is this. He is building a bottom-mid bike. Its not going to peak at a very high rpm and its gonna build power quick. One of the keys to this is velocity, and you cant get a whole lot of velocity with gigantic carburetors bolted on the thing. Just cause most people do something, doesn't necessarily mean its the optimal thing for everyone to be doing.