predator 212 governor removal

[exenos]

It might be valve float it's supposed to happen around 5500 rpm on stock clones, although I've never experienced any pulsing with my clone and I've had it up near the 7k mark.Still trying to figure out how it does that stock.

 

[Doc Sprocket]

It might be valve float it's supposed to happen around 5500 rpm on stock clones, although I've never experienced any pulsing with my clone and I've had it up near the 7k mark.Still trying to figure out how it does that stock.

For comparative (scientific) purposes, how are you measuring that?
As far as how it happens, it's all in the springs. They can tend to flutter at a certain RPM, but with all the various manufacturers and parts suppliers, there is a large possible margin.

 

[tundrabeagle3]

the noise stopped after i rode it wot for a while. i got a top speed of 37 mph with 16 in tires and a 6:1 ratio and everything stock. according to the mini bike speed calculator i only got to 4700 rpm. i checked the throttle valve and it was opened about 7/8th of the way would this be enough to keep rpms down ? any tips on getting it all the way open?

 

[Doc Sprocket]

If there's still room for the throttle to open, then you have to adjust your throttle linkage/cable. This may entail altering your cable mounting points to that the cable travels further from idle to WOT.

 

[tundrabeagle3]

thanks for the the response i will look into adding a cable adjuster to my throttle set up.

 

[exenos]

For comparative (scientific) purposes, how are you measuring that?
As far as how it happens, it's all in the springs. They can tend to flutter at a certain RPM, but with all the various manufacturers and parts suppliers, there is a large possible margin.

I'm using a digital tach and its a princes auto power fist clone.
I know that I'm getting that rpm under load as well because I checked the speed with a gps an used a reverse speed calc to get the rpm and it out put something around 6800.

 

[Bluethunder3320]

EDIT--- i replied on the first page. now my post is out of place.



you have probably backed out the throttle stop, or put the spring in a different hole to pull back the linkage more. the governor is fighting to keep the speed down and it "surges"

if you want to beat the governor without modding the engine you can tie a thin string from the throttle arm to the governor arm. i dont have a picture of this but hopefully you know what im talking about. that way when you pull back the throttle arm it directly moves back the governor arm.

when the engine is running you can put your fingers under the gas tank and pull back the governor arm, it will directly operate the carb. same idea.

its not recommended to do it this way but ive done it without ever having a problem

 

[tundrabeagle3]

yea i think i will move the governor return spring because it creates a lot of tension making it hard to get the throttle all the way open. would the throttle valve in the pic affect my performance at wot?

 

[Doc Sprocket]

I'm using a digital tach and its a princes auto power fist clone.
I know that I'm getting that rpm under load as well because I checked the speed with a gps an used a reverse speed calc to get the rpm and it out put something around 6800.

Gotcha. Your tach- is it the laser tach that Princess sells? I have one, and it's dead handy! With regards to the GPS thing, just make sure you're doing LONG hi-speed runs of at least 30-45 seconds at full bore to allow the most accurate read- takes a bit for the unit to best average the satellite reports.

When I was figuring out everything on my kart, I did 8 passes of about one minute long, in opposing directions, and averaged the result.

 

[tundrabeagle3]

yea i think i will move the governor return spring because it creates a lot of tension making it hard to get the throttle all the way open. would the throttle valve in the pic affect my performance at wot?

i got throttle all the way open and am still getting 37 mph (around 4700) with the throttle wide open on a long level street. is that normal for a stock un governed predator 212 ?

 

[Doc Sprocket]

Define "normal".

If your gearing (in relation to the available horsepower) can only push you that fast, then that's how fast you go- and in turn, how many RPM you can achieve.

 

[tundrabeagle3]

i have a 6:1 ratio with a 16 inch rear tire. I have gotten to 5500 rpms with my 5 hp briggs with the same gearing.

 

[Doc Sprocket]

Good question. WOT is WOT. Perhaps the Briggs carb is more capable, or stronger valve springs- he//, maybe it's the torque curve that's making the difference...

 

[tundrabeagle3]

The briggs did have an uni filter and straight exhaust when i got it to 5500 rpms, im going to try and do the same for the predator. im guessing it will open it up the powerband up for more rpms. makes me wonder how exenos is getting 7000 rpms on his stock predator.
thanks toystory for the replies.

 

[exenos]

It's not a predator, it's a 196cc power fist. Not sure if that makes a difference but it may have stronger springs than normal because it might have been cheaper for the company than the weaker "stock" springs.
Also changing the muffler is a HUGE increase in performance, at least for me. I put a open pipe on mine and noticed a large increase in acceleration at all speeds, but almost no increase at top end,

 

[tundrabeagle3]

i added a 90 jet, ar3910x spark plug, k&n style air filter and a header with hot dog muffler. I did another top speed run with my gps and only got 40 mph. kinda dissapointed with it because it only feels a little stronger than before and alot less torquey than my 5 hp briggs. is anybody getting more than 4900 rpms with a ungoverned predator 212 with stock springs?

 

[exenos]

Maybe check the plug reading? If it's rich then remove the hot dog and see how it works.

 

[tundrabeagle3]

here are some pics of my set up. i don't think its running rich this is a common set up for predator 212s on omb. does the crankcase tube need some back pressure to run better?

 

[Brandon1023]

I have a 420 Predator and it has the governor in, still. I have no plans of removing it either. Backing out the throttle stop screw on my engine allowed for 4500 RPM under no load with a tinytac.

As far as engine harmonics, how long does it take to damage an engine, running it with no load at high RPM?

 

[tundrabeagle3]

i suggest you start your own thread, you will get more responses.