Increase HP in 2015 EZ GO S4

[Numbers]

Hey everyone - been searching for this answer but could not find it, thanks in advance for any help you can give.

I have a 2015 EZGO with the 13.5 hp Kawasaki engine. I have looked high and low for performance parts for this engine. Not finding anything.

Anyone got a source for performance parts for this engine? Also ideas on what is best place to start? I figure upgrading the exhaust should come first, looks like what is there is extremely restrictive. I am not trying to drag race the buggy, just get more torque and hp.

Thanks!

[EZ GO L4 Beach]

I can't see any "performance" part really doing much for these engines other than a new clutch, which will net you torque down low but sacrifice your top end. An exhaust on a small hp motor like this isn't going to give you anything significant. It actually may wind up leaning out your a/f ratio and hurting your motor. If you adjust the governor, you should be able to top out in the mid to high twenty mph without floating the valves. I've seen 30 in mine, consistent 28.x on flat ground.

[BrewCityMusic]

First and Foremost, keep in mind (along with the aforementioned "Valve Float") that your cart has plastic governor gears in the rear end, which are known to "grenade" under sustained high speeds (which leaves a REAL mess) - if You're going to tweak the Kawasaki drivetrain at *all* it's best to take the preventative route and remove them from your transaxle entirely. I've seen them let go on stock carts that had nothing done but governor tweaking, they just weren't designed for anything over 15mph or so and when You start cranking things down and running at 18-20mph+ it's basically just lighting the fuse. That whole drivetrain is a great example of "just because You CAN doesn't mean You SHOULD" ...

the TEAM clutch upgrade for the 401's is a HUGE upgrade, and definitely the single-best thing You can do for that cart. 20% more power to the ground over stock and the same final ratio as stock so no decrease in top end.

As mentioned above, keep in mind that You *will* start having fuel issues if You change the stock exhaust, at very least You will need to drill out your jets in proportion to how much You are upping the flow but that can get rather hard to get right and generally results in sacrifices with starting, low-speed running, etc.

[Golf cart guy]

Those motors hate to be turned up. Rod threw the block due is end result.
High speed gears to keep RPM down is the answer.
I agree also that the rear ends are weak also. Bad thing is high speed gears don't help them last any longer.

[doo dah]

Old thread but I've been searching awhile for more power and all I come across is adjusting the governor. My cart is a 2013 but I have 25" tires so even though I run 25mph+ for long periods up and down the beach I have yet to experience an issue with the motor or axle. I assume because of the large tires RPM is down and therefore less stress at that higher speed, don't know. I also did Gboost belt, springs, and rebuilt the clutch which helped with torque and actually did not impact top end. Ultimately an engine swap is only thing that will get more actual power.

[EZ GO L4 Beach]

Ran my S4 from 2014 to just selling it this weekend, ran perfectly with the governor maxed out. I ran it at full speed rarely, typically around 15-20 most of the time, maybe that helped.