Freestyle Carbs, what the diffrence? 48 Novi, 48 Rive PB, 48 full specs sct

[Christian_83]

Hi Guys.
I've been wonderind about the diffrence in these big carbs. I might get flamed here - but here goes.
What are the diffrence in these carbs, lets compare the 48mm with Mikuni body, i notice some have bombs sights in diffrence size and so. But could someone please explain to me, what are the diffrence?
Thanks

 

[kevbo]

The only information available is the name and number associated with the product. All a jetskier needs to know is that "Its bigger, we make it, and you need it". There is more technical info on a bottle of shampoo. Its best to find a carb that has venturi, like a stock mikuni. Aftermarket modifiers like to cut that out for more flow and use vortex generators to make up for reduced air speed. This actually works well with jetskis since the throttle is used like a switch and peak rpm is largely fixed. Big carbs need a significant venturi and/or a vortex generator on the spraybar in order to work well on smaller and/or slower turning engines. A restrictive flame arrestor can do the same thing. A pair of SBN44-46 work extremely well for the money.

 

[2lick]

Call and talk to one of the carb guys... like Ed at Full Specturm or the guy at Novi.

I have always loved the FS carbs, but have not compared to novi, etc. I can only speak for FS, but when you buy a carb from them you get more then a hunk of aluminum.... you get a good amount of knowledge transfer, support, and can pull from their experiences both bad and good. That is worth a lot in my opinion.

If you want to get into the details and design, be prepared to spend some time and learn a lot!

 

[cljetski]

Ed at Full Spectrum has tons of information and likes passing the information to others. Was on the phone with him for 40 mins. the other day.

 

[D-Roc]

I use powerbombs, they are 48's and work really well for me. The next best thing imo is the FS or NOVI's those are tits!!! go big then go home.

 

[KTM434]

Are any of these a better freestyle carb? Novis, full spectrums, RIVA power bombs, etc.
as for 44s and 46s... I hear red tops, black jacks, buckshots, SREs are all race carbs. OEM 44s are hard to tune so that basically leaves just a standard aftermarket 44 or 46 Mikuni or the big bore/big dollar carbs listed above. Any insight on this? (Im only interested in riding surf and I dont care about peak RPM or max CFM flow)

 

[scottie mac]

You are going to get a ton of different opinions on this topic. IMO, the best carb is the one you can get tuned in the best. The greatest carb in the world is only as good as the person tuning it. Having said that, IMO, FSs and Novis are the best around. Have used them both for years and never seem to have any issues with them. If I couldn't get either of those, a standard mikuni 46mm is the only other thing I would use. As Kevbo mentioned earlier, for the money, they are tough to beat.

Scottie

 

[KTM434]

Thanks! I have a couple used Full Spectrum 44s on the way and can't wait to try them out... They happen to be mounted to a big bore 85.5mm ported 61x cylinder on 62t cases so I should have some serious Braaap soon. I'll be impressed if it beats my RIVA ported 760 and I think that will be very doable if ported and tuned correctly

 

[Matt_E]

Don't tell my engine that BlackJacks are race carbs. :shh:

 

[Waternut]

There is a lot to be said for a well tuned carb over a poorly tuned aftermarket carb. However, I do want to say that my dual 44 SBN's ran great and were tuned very well. Then I bought dual 44 GRS carbs (similar in design to Blackjacks) and those hit harder before I got them dialed in than my SBN's. Meanwhile, my buddy tried for weeks to tune his Blackjack carbs and never got them to run right so he stuck his SBN's back on and the motor ripped like crazy. My point in this post is to say....not all carbs are perfect for you engine setup.

Lastly...ask a knowledgeable engine builder and they will most likely tell you bigger is not always better when it comes to carbs.