Taper bored 38's on a 845cc Big Bore?

[Jr Freestyle]

While we're at it, which oil is the best?
Also, who builds the best motors?

So your saying performance wise they are all pretty close??

[Scorn800]

Mark Erickson builds the best motors..........

Does he use a dyno?

[Matt_E]

So your saying performance wise they are all pretty close??

Most people don't take the time to objectively compare different carb setups, tune them all to perfection, make sure everything else is equal, etc. I have yet to see such a test. So you get a bunch of opinion and brand loyalty.
My personal opinion is that if you've got a well tuned carb setup, there isn't all that much to gain by going to another well-tuned setup (unless you got a really chitty setup to begin with).
Also, a poorly tuned top dollar setup will be outperformed by a well-tuned set of stockers.
If you've got the money, the best setup is the one your engine builder recommends to run on the package he is building you, with the specs he tells you to run.
Personal experience.
My BlackJacks perform better than anything else I've had in the past, but this is on a Jetworks motor, set up by Art from the ground-up. And my prior carbs and motor setups were done by me (a hack), so it isn't really a fair comparison.
I don't know how other carbs would perform on my current setup, because I don't feel like messing with it. I trust the guy that I paid a bunch of money to build it for me.

[Big Kahuna]

Does he use a dyno?

Dont know, look next to his Air Compressor next time your at his shop!

[waxhead]

Very true words there Matt
I have seen so many skis with people claiming this and that and how crap one set of carbs are etc. Then riding it and tuning it and then they are all happy.
I think with bj carbs you get the setup art recommends and so because its close you are very happy with them.
You dont get that with novi or stock 46 so you they only go as good as the person tuning them.
As far as taper bore 38s I would refuse to tune some ones ski if they had taper bore 38s on them. They are so inconsistent and the fuel flow doesn't match the carb flow and so there are always weak spots in the carburation.
Best cheap carb set is still the oem 44s in my book. Other than that its novi all the way

[2XLR8]

I think tuning a set of taperbored 38's is way different than tuning a set of 44's or larger carbs.

Wax maybe you don't work with too many taperbored 38' so you don't have it figured out yet.

I'm currently building a 771 for my 16 year old nephew and we are going to run the original 38's taperbored and the thin tube with the stock air box. I should know how they tune in a few weeks. I hope to remove the carbs only once to get it dialed in.

[waxhead]

Yes that will be it. my lack of experience will be stopping me from getting the 38s to run correctly

[2XLR8]

I'll let you know how my limited experience with the 38 plays a role in tuning them.

[Matt_E]

Lol.

[Breese08SJ]

Very true words there Matt
I have seen so many skis with people claiming this and that and how crap one set of carbs are etc. Then riding it and tuning it and then they are all happy.
I think with bj carbs you get the setup art recommends and so because its close you are very happy with them.
You dont get that with novi or stock 46 so you they only go as good as the person tuning them.
As far as taper bore 38s I would refuse to tune some ones ski if they had taper bore 38s on them. They are so inconsistent and the fuel flow doesn't match the carb flow and so there are always weak spots in the carburation.
Best cheap carb set is still the oem 44s in my book. Other than that its novi all the way

Hmmmm... Thats funny I have a set of Jetworks Mod 38's and they are spot on... They came to me jetted by Art, I listened to his instructions on how to adjust the screws by how the boat reacts at various Rpm's and throttle positions and it took no time at all to set them up! I've had plenty of people ride my boat who have the same size motor and the bandwagon 44-46's with Rad Valves blah blah blah etc, and everyone of them have been impressed with his 38 Mod carbs. Little off topic but maybe people should take some advice from people like Art @ Jetworks, He wouldn't recommend a set of 38 Mod carbs to someone if he knew they didnt work and they wouldn't be happy with them. All that would do is kill his business and credibility.

[Matt_E]

I rode a motor almost identical to yours and it was very snappy.

[WaveDemon]

Most people don't take the time to objectively compare different carb setups, tune them all to perfection, make sure everything else is equal, etc. I have yet to see such a test. So you get a bunch of opinion and brand loyalty.

The only time I can think of that this isn't true are with xmetal modified carbs (if you want to call them AM). There are times when even xmetal will use Full Spectrum carbs over their own.