MT is slow!

[Shalako]

So I've ran about a tank and a half through my MT after installing the ProStock 5.5hp. It is horribly slow. I haven't tuned it completely yet, just been running rich as I break it in.


Any reason it would be slow at this point? I would think as I tune it would lean out some and then run a bit faster.


Have a Dominator pipe and HPI filter and stock carb on it.


Thanks.

 

[Guest]

Most new motors start to come to life after the 5th tank. If running to rich it will bog and perform poorly.

 

[Shalako]

Could there be a carb problem?

 

[Stygian]

I personally would upgrade the stock carb, as I personally have had nothing but problems with them the 990 is a good choice and I have heard the 998 is good too.

 

[Shalako]

Well I did get a new one from RCDAD but I didn't want to install it till I got the MT up and going.

 

[alfred e numan]

i am not certan the factory hy carb can flow enough air or fuel to be really be able to light up the ported engine you have @ high rpm. the added resistance of the choke plate-shaft breaks up the air flow. I mess with carbs on assorted engines frequently. I have a little f-270 with a 813, 1" velocity stack, jet-pro rear. this required running the fuel bulb about 90% full, hsn 1.75 out, lsn nearly 1.25 out. this is @ about 70 degrees, 35% hunidity. thats a Lot of fuel!!

 

[Shalako]

Might have to put in the 998

 

[TheCount]

I have the 813 on my MT. 998 is the new version of the 813. you will notice the diff over std carb. It's a good carb for the MT. The accel pump helps. I can notice the diff between my MT with the 813 & my DR with the stock carb. My MT even being bigger , is snappier than the lighter DR.

Also put a Alloy carby manifold & velocity stack on.

 

[Jackleg]

I put a 990 and alloy intake manifold on my MT and it made the biggest improvement in performance over other mods I've done.

 

[rampagemt]

Yup the 990 is a great carb hands down