new pro kart picked up last night

[Russ2251]

keeps you busy trying to get both to idle the same.

In reality, the hardest part was high speed needle adjust.

 

[zip kart]

So if i can find out how many turns the idle screw is set on 1 of the engines
just set the other engine the same??

 

[firemanjim]

If i had 2 motors, i think i would spend like $30-40 and get 2 of them little tach/hour meter boxes off eBay. It reads the rpm and keeps track of running hours. Mount both to your steering wheel (they're small) so you ALWAYS know whats going on, at a moments glance....
The main advantage with 2 motors is HP and not spending a couple weeks worth of wages to get it. Now you got twice the power, so you can re-gear for a higher top end,just dont get crazy with the ratios...

 

[firemanjim]

So if i can find out how many turns the idle screw is set on 1 of the engines
just set the other engine the same??

If you turn one in all the way, unscrewit about 1&1/2 turns. Then start and see how it idles,adjust if needed, counting your turns. Once its running how you like, mimic the number of turns on the other carb. That should get you in the same neighborhood, if not the same street....

 

[Poboy kartman]

So if i can find out how many turns the idle screw is set on 1 of the engines
just set the other engine the same??

Theoretically-yes, in reality probably not, a tac is the only way. Why are you so concerned about idle speed, what's more important is synchronizing them off idle.

 

[zip kart]

How can i do that ?

 

[zip kart]

Can someond send me a link for 1 of those meters to tell rpm
Thanks for all the help so far

 

[Russ2251]

Keep in mind that once both clutches are fully engaged, both tachs will show an identical reading no mater how off or on target the throttles may be.
Engines self synchronize when clutches are fully engaged.
When one engine reads 6500 rpm, so will the other...even if it is out of fuel!
The 2 tach idea will not work above ~2000 rpm.

 

[zip kart]

so what should I do ?

 

[Russ2251]

My guess is you don't have to do anything unless the previous owner was clueless as to how engines should be set up. I think this unlikely, but possible.
I would run it the way it is as received. Make no adjustments unless you can perceive that something is wrong.

 

[zip kart]

well d reason why I wanted to adjust them is because when they are ticking over they start moving on there own
and when im driving and let off the gas the still go abit ???

 

[Russ2251]

Just back out idle speed screws (anti-clockwise) until kart does not roll on it's own.
My idle speeds are not identical. Varies as much as 300 rpm between the two and has no negative effect on top end.

 

[Poboy kartman]

well d reason why I wanted to adjust them is because when they are ticking over they start moving on there own
and when im driving and let off the gas the still go abit ???

That's more than likely the clutches and not the idle speed. They're slightly less complicated than a Swiss watch.... (actually not too complicated) since you have 2 you have a backup, but I took one apart for the first time and was able to reconstruct how it went together with the pieces.
They're rebuildable and parts are available online. Just proceed slowly and take pics along the way (I didn't).

 

[Poboy kartman]

Another thought- try running it one engine at a time. Probably only one clutch is bad and this might show which.

 

[firemanjim]

Keep in mind that once both clutches are fully engaged, both tachs will show an identical reading no mater how off or on target the throttles may be.
Engines self synchronize when clutches are fully engaged.
When one engine reads 6500 rpm, so will the other...even if it is out of fuel!
The 2 tach idea will not work above ~2000 rpm.

I do not understand how you came up with that conclusion. If i have one engine running wide open and the other onlyhalf throttle, the tachs will read each motor iindividuall. With chains off, you will get a correct reading on rpms. Chains on, MIGHT be a different story, but i dont think so. Why would pro karts run 2 individual tachs if what you say is true? Tach gets signal from ignition, need certain amount of fuel to run certain rpm. If engine isnt getting it, it cant run that fast..... If it has no gas and not running, the tach CAN NOT RECIEVE SIGNAL and therefore show no rpm. The shaft has to turn to get a signal and the CC drum WILL NOT turn the shaft no matter HOW FAST you spin it. Shaft has to turn to make the drum spin......

 

[Russ2251]

Trust me ...I speak from experience.

 

[zip kart]

how would I put a kill switch under the steering to turn off both engines because each engine has a kill switch on the side but there 2 awkward to reach if anything happened

 

[Poboy kartman]

Keep in mind that once both clutches are fully engaged, both tachs will show an identical reading no mater how off or on target the throttles may be.
Engines self synchronize when clutches are fully engaged.
When one engine reads 6500 rpm, so will the other...even if it is out of fuel!
The 2 tach idea will not work above ~2000 rpm.

This makes sense to me. Centrifucal clutches aren't one way devices, in other words, once they reach a certain rpm they are engaged, whether that rpm is reached by the engine they are attached to or the chain.

Now once engaged, the whole drive system is pretty much (for lack of a better analogy) a direct drive gear system. So what I'm trying to say is you have two small gears driven by the same big one. Impossible for them to deviate from the rpms involved.

Not impossible with the kart setup-but only if one clutch is defective.

 

[mckutzy]

I havent payed much attention to this thread , but...
Zip- If the motors are just honda/clones, tap into the low oil sensors, wired with a push button switch.

 

[zip kart]

I havent payed much attention to this thread , but...
Zip- If the motors are just honda/clones, tap into the low oil sensors, wired with a push button switch.

there genuine Honda gx160's and there is no oil sensors on them
just the kill switch on the side of the engine so I want to move them to have them under the steering wheel
for safety