Kevin,

That is awesome! Any podium pics this time?

yes

just picked up a blue head one of these engines, has anyone had any issues with the carb?

how far off race tune is the out of box settings?

The box setting are just to get it started. You should then tun for break in then just retune for races. But once tuned should hold the tune very well!

after break-in my motor is not to far in from flush on both needles. with temps here are about 65 degrees. high end needle is about 1/2-3/4 turn in from flush. this is just for reference, as everyone one tunes different. Fuel, plug, and temp play a big roll. hope this helps out a lil bit. I run the pr21c 3port and pr21bs 5port and love them for the price you cant beat them.

Guys also notewe have the new EVO engine in stock and should have them into AMain soon!

Great job Kevin and Tanner!
PR21BS WINS AGAIN! Tanner continues to prove the abilities.



Also Taylor James has drove the new PR21BS EVO engine to amain position at the Southern Nats!

not very impressed so far..

changed over from alpha engines,

leaking front bearing now on two engines.
and a carb thats grabbing when going in and out... its brand new -.-

your precirotate has leaky front bearing or your alphas? i have not had a single problem with my motors. i run the pr21bs and pr21c both run flawless

He is talking about his PR Engine.

I replied to his last post about the bearing. It was leaking during breakin. Most likely too rich. Lean it out and continue the process.

As for the carb make sure that the slide is being pulled straight. If the servo pulls it at an angle this could cause the issue on any carb.

Hope this helps.

Jason

Hey guys i'm new on this forum and was thinking about buying a pr21bs. I will drive it in my MP9 on relatively short and sharp curved tracks which are mainly made out of artificial grass. Therfore bottom- and mid end are most important. I have a new Go efra2047 pipe and was wondering if anyone could tell me if this might be a good combo with the pr21bs. Besides torque, mileage is an important aspect as well (obviously). I can chose between the go or to order the precirotates efra 2088 pipe, which i've read good things about in this thread. Other stuff is a bit to expensive. hopefully someone can give me some info about the Go pipe.

alright, now honestly, can anyone give me the power difference between the 3 port, and 5 port. Also, is there anyway that I can get the OD of the sleeves? Are they the same OD as the GO engines?? Thanks in advance!!

The 3 port is a great engine but for racing I would go with the 5 port. Just a more well rounded engine!

if you really need to know the OD of the sleeves i can go pull them apart and get measurements for you, i have both engines, i know rods are the same.

Inferno, I dont want you to pull it apart just for that. The bore and stroke is the same, so I highly doubt that they changed the OD of the sleeve, as that would mean more machine work. I dont run the offroad stuff, but run nothing but GO engines in my boats. I machine my own head buttons and water jackers, and raise the port timing, and induction timing myself. So always looking for a better (read cheaper) way to go. Looks like these P/S along with the JS P/S will work in the GO case. Very cool to see more based on the same platform though (im sure they have there own timing changes, etc) but its a great series of engines!!!