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Post by jetsteve2011 on Nov 23, 2018 11:32:30 GMT -5
I’m ready to order a new carb for my prebug Zuma. I’ve got an athena sport 70cc coming and have the stage6 r1400 exhaust already. I plan on getting the stage6 big valve intake, but deciding on a carb type and size is stressing me out.
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Post by jetsteve2011 on Nov 23, 2018 11:35:55 GMT -5
Also plan on getting a new variator when I order carb. that is equally stressful deciding which one.
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jack667
Scoot Enthusiast
Posts: 190
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Post by jack667 on Nov 23, 2018 12:05:57 GMT -5
I have a setup like yours, and I'm building a second one. But - I'm still a total newbie compared to most of the other people here that post regularly. So - caveat - I really don't know what I'm talking about and have very little experience! I bought the Dellorto 17.5 for my '08 zuma and I'm pretty happy with it. I like the simplicity of re-using the electric choke, oil lines, and my jet kit. I'm sure others will say that one should go with manual choke and pre-mix, and then go to 19mm or even 21... I like it so much, I just ordered another one for the '05. (But, I don't really have anything to compare it to, other than stock) Jack
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Post by jetsteve2011 on Nov 23, 2018 12:16:22 GMT -5
I’m a total newbie to scooters myself. I bought this off an older couple that used it when they went to Florida. I drive it to work 2.5 miles. I’ve became obsessed with making it go faster. I could buy a big bike and go faster. A co-worker let me ride his Harley with like a 1300cc. It was nice and had power like I’ll never have but I like the zuma better.
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Post by jetsteve2011 on Nov 23, 2018 12:18:38 GMT -5
I was thinking bigger like the 24,26, or 28mm. But what’s too big? I’d eventually like to get the Athena 80cc kit w/ longer crank.
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Post by 'O'Verse on Nov 23, 2018 13:56:35 GMT -5
Id say the biggest you'd want to go is 28mm Keihin on a 70-80cc race build. Your running an air cooled engine race exhaust with a sport cylinder so your rpms won't be as high as say a full or hyper race build. So I wouldn't go any higher than a 28mm. In theory A 21-24mm would work just fine for what your running. 15-21mm I'd go with a Dellorto. 19-24mm I'd go with a polini. 24mm only I'd go with an Oko. 28+ mm I'd go with Keihin. if you've caught the bug like you say. Chances are your gonna keep chasing down faster and faster cylinders.... Your pipes ready for a full race category build anyway. There's a member here named Pig. He uses the r1400 with an air cooled 70cc race cylinder and 28mm carb with great success. He might have some pointers for you in both the carb and Variator category on a pre bug. Dellortos are known to run flawlessly time and again when jetted correctly. Phbg or vhst. You can't go wrong with name brands like Dellorto, Keihin, Polini, Malossi, Oko, or even stage 6. The Malossi and Stage 6 carbs are usually just rebranded Dellortos so...... Like jack mentioned before if you haven't already you will definitely want to go premix and manual pull choke for that set up. Your gonna be reving past 10,000 rpms. The chances of an oil pump producing enough oil for that combo is slim to none. Good luck. Question i have is have you done anything with your crank yet? Are you still using your stock crank? Anything higher than 10,000 rpms puts a lot of stress on a stock crank.
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Post by pinkscoot on Nov 23, 2018 14:02:52 GMT -5
My 2 cents, I have been using Delorto 19mm PHBG carbs and they have done me well. The parts are readily available and they are very tunable. They do require a manual choke but that's never been a hassle. Treatland has a 18% off sale through the weekend. They have good prices to start with. Here is a link to more information on the sale: 49ccscoot.proboards.com/thread/23967/treatlands-black-friday-sale. As for the variator, I am a big fan of Malossi Multivars but there are people here that have their favorites as well. What ever you do don't go cheap it will come back to get you.
Edit O'Verse beat me to it.
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Post by ryan_ott on Nov 23, 2018 18:35:00 GMT -5
A genuine Dellorto 19mm or 21mm will suit you well. They are great carbs and once tuned they don’t require much fuss season to season. I’m running the Athena 80cc with a 21mm and there is no need for anything larger. A 19 may give better fuel economy. Unless you plan on turning 13-14,000 rpm plus I don’t think there is a need to run large carbs they are more difficult to tune part throttle and burn a lot of fuel.
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Post by 190mech on Nov 23, 2018 20:01:19 GMT -5
No carb info here,,An R1400 pipe is waaay more than that cylinder can handle!Save that one for a future build and find a milder pipe for this one...
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Post by jetsteve2011 on Nov 23, 2018 22:23:00 GMT -5
I ordered the mallosi “la Furia Rossa” variator kit, stage 6 intake, and a generic 21mm pwk style. That set me back $600ish. Hopefully, I can make that set up last 6 months. Then I’ll reassess at least upgrade crank and to a race cylinder. Thanks for the input everyone. I’m sure I’ll have questions once everything arrives and I try to build and tune.
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Post by jetsteve2011 on Nov 23, 2018 22:38:05 GMT -5
I got such a good deal on the r1400 pipe and Athena sport kit it was too much to pass up. I may consider selling it for something milder if it doesn’t perform like I want.
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Post by 'O'Verse on Nov 23, 2018 23:12:06 GMT -5
Definetley keep the R1400 in your arsenal. Just pick up a matched race cylinder and crank combo next.
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Post by niz76 on Nov 23, 2018 23:21:41 GMT -5
R1400 is a pretty big revver in the pipe game. Revvy pipes like this don't like to make much power down lower in the rev range. Sport cylinders like the Athena sport probably isn't going to be able to rev nearly where that pipe would make power- so yeah- all the carb info provided here is spot on. I just came to comment on the pretty big cylinder/pipe mismatch. Anything that's gonna run well with that pipe will certainly require an aftermarket crank. Scoot on!
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Post by jetsteve2011 on Nov 24, 2018 12:22:28 GMT -5
I purchased the Malossi overrange variator kit. I see there’s not a new clutch with it. How important is it to replace/upgrade the clutch and the primary gears?
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Post by Lucass2T on Nov 25, 2018 5:04:20 GMT -5
That pipe can work with that cylinder. Make sure you have it ported and timed to suit that pipe. It won't be as powerful as a true race kit because of the lesser port areas...but in theory it should work.
Do some research on timings first, decide wether you want to keep that pipe or switch to a yasuni c16. Carb wise id pick 21 or 24mm. Dellorto would be an excellent choice or go with the Mikuni TM24.
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