Super Jet Dual 44s or dual 38s for 770 motor?

[Dustin88]

I have a 62t bottom, 61x top with a 5mm protec stroker crank and 82mm pistons with a SJ Mod b-pipe. Right now it has dual oem 44mm mikunis on it.

Right now it has no bottom end hit, I just kind of sputters below half throttle then takes off and runs great up top.

Im trying to get more bottom end out of it, What can I do to get more bottom end out of the 44s? Right now the carbs have 110 p and 110 m jets in them.

Would I get more bottom end hit running oem dual 38s? I have a set laying around

 

[Byeai]

I had same problem with my Jetmaniac motor is was my needle and seat oring not holding pressure so my pop off was way off

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[Vumad]

44's should hit. Tune it.

Not implying you don't know, but just in case, tune means more than main, pilot and screws. You need right needle/seat/pop off, right pitch prop, right timing, right screw settings on your pipe. If it is a jetmaniac motor, just ask him, he'll tell you what to do.

Otherwise, I'm sure someone will post some specs.

If you don't have a mikuni pop-off tester, you should buy one. $50+/- from JM

 

[Dustin88]

I do suck at tuning! Its an old race ski, it was already put together when I got it, I know it was tuning for racing and it is tuning great to racings, Im just trying to turn it into a freestyle motor. I know the porting is probably not ideal but I will keep playing with it, I just read somewhere that sometimes dual 44s do not have enough pull though them on smaller motors and bottom end will suffer.

 

[Freakrider]

Reed and case stuffers along with an epoxied ramped intake manifold step up the air velocity especially for the small motors and make the 44's perform better...imo.

 

[CWAmeden]

I'm running dual 38's modded my jetworks on my jetmaniac 781. It has great bottom end hit!

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[Yami-Rider]

dual stock 38s on my buddies JM 771...runs great.

 

[tipafew]

Aftermarket 44's will work well with that motor. Are they OEM 44's or A/M Mikuni 44's?
Make sure whatever you are using has fresh rebuild kits and throttle plates.

 

[blaster800]

Your presently running untuned 44's and it has poor low end performance , you have a set of untuned 38's laying around . The 38's are not going to dial themselves in all of a sudden any more than the 44's will . Just work on what you have in the ski already . When you get them dialed in correctly they will scream from bottom to top , follow these instructions and the 44's will make you happy , it solved my tuning problem which was lack of tuning knowledge .... http://www.x-h2o.com/threads/58480-Carb-Tuning-101-Info-From-WATCON&highlight=tuning

 

[Dustin88]

Ok I will work on tuning them, I guess they are aftermarket 44s, They are grey and have the easy turn adjusters. Took it again today, screams up top just have to get that bottom end tuned!