pros and cons new carb

[GIGAWATTS]

I’m new to gas, and have never run nitro. I just got a Rampage MT V4 about 3 month ago. I’m having trouble with the tune it seems to change. I have talked to a few people who say it’s the carb, but no one recommends the same carb . Could someone layout the pros and cons of using each .i plan to put a CPI pipe on and the RB hypercharge or if ther is a better one and it


Wt-668


Wt-813


Wt-990

 

[jeffp83]

668 - set it and forget it carb. Very easy to tune and having a choke makes engine starts a breeze.

813 - has an internal accelerator pump which gets rid of the small lag that is present in the 668 carb when initally getting on the throttle. A tough carb to find the sweet spot on and after a while I found it was increasingly hard to start the engine with. Because the choke has been removed there is also less air restriction.

990 - same carb as the 813 but without the accelerator pump. I've read a lot of positive things on this carb and I think OBR recommends this with all of their new engines.

Don't bother with that RB hypercharger filter, get this and http://www.davesmotors.com/s.nl/c.885035/n.1/it.A/id.771/.f to go along with it. Best filter system IMO.

 

[Deluge1]

Go with a 668 or 990. The 813 has throttle shaft issues. I run a 668 (MT) and a 990 (5T), and both are great carbs.

 

[Keith81]

I have the 990 on a stock motor and on my OBR motor as well, its a good carb!

 

[GIGAWATTS]

thanks for all the help. the owners of my LHS are NO help at all. Largescale is about 2 hours away I plan to run over there next spring if they have more playdays to meet more people who run 5th

 

[Chaser]

Do you bash or race? bash 668 race 990

 

[Keith81]

Should I put a 668 on my full mod obr? I bash....

 

[Deluge1]

Unless you're having problems with the 990, I'd say leave it alone.