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Discussion Starter · #1 ·
Hello all,

I would like to discuss performance upgrades for a Polaris ranger 150 EFI 2021 model. I bought the new Ranger for my kids and noticed that the ground clearance was not as advertised. I love all the new features and think it’s perfect for my kids. I recently purchased a new set of rear tires that are 14 inch rims with 26 inch tires. I have a lift kit ordered that I plan on only using the on the front end to kind of level the UTV a bit And leave stock 22 in factory tires on the front.(2 in) This has significantly increased the ground clearance in the rear by about 2 inches. (Was around 6.5 now 8.5)

I took it out with the kids on about a 30 mile ride and had no issues with him hitting anything. I did however notice that the larger tires had trouble in sand and would like now to increase the performance of the machine. After doing some searching I found a few performance clutch parts that I plan on installing. Namely a performance torque driver and clutch. I’m also getting some smaller rollers.

now I’ve been looking at big bore kit’s and crankshaft and wondering if anybody has any experience.

I can tell through research that this UTV has the GY6 motor with serial number jl1p57f. It is an a model that I verified by measuring the bolts on the cylinder head.

with the a model GY6 the largest I can safely go is the 63 inch big bore kit. Then I will have to bore out the case. I can also get a +3.5 mm stroker crank shaft that will put me at a 191 cc engine.

has anyone done any of these mods on the Polaris ranger 150? I’m specifically wondering if the electronica fuel injection is enough fuel for this size and if boring the case makes it too weak.

my kids are too small for the 570 and I really want to make this machine work until they’re old enough.

thanks for any of the comments.
 

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Hello all,

I would like to discuss performance upgrades for a Polaris ranger 150 EFI 2021 model. I bought the new Ranger for my kids and noticed that the ground clearance was not as advertised. I love all the new features and think it’s perfect for my kids. I recently purchased a new set of rear tires that are 14 inch rims with 26 inch tires. I have a lift kit ordered that I plan on only using the on the front end to kind of level the UTV a bit And leave stock 22 in factory tires on the front.(2 in) This has significantly increased the ground clearance in the rear by about 2 inches. (Was around 6.5 now 8.5)

I took it out with the kids on about a 30 mile ride and had no issues with him hitting anything. I did however notice that the larger tires had trouble in sand and would like now to increase the performance of the machine. After doing some searching I found a few performance clutch parts that I plan on installing. Namely a performance torque driver and clutch. I’m also getting some smaller rollers.

now I’ve been looking at big bore kit’s and crankshaft and wondering if anybody has any experience.

I can tell through research that this UTV has the GY6 motor with serial number jl1p57f. It is an a model that I verified by measuring the bolts on the cylinder head.

with the a model GY6 the largest I can safely go is the 63 inch big bore kit. Then I will have to bore out the case. I can also get a +3.5 mm stroker crank shaft that will put me at a 191 cc engine.

has anyone done any of these mods on the Polaris ranger 150? I’m specifically wondering if the electronica fuel injection is enough fuel for this size and if boring the case makes it too weak.

my kids are too small for the 570 and I really want to make this machine work until they’re old enough.

thanks for any of the comments.
The fuel injection is calibrated for the diameter of the throttle body, not the size of the engine - changes to the intake and exhaust will affect the fuel injection, but it will have to be hooked up to a dyno and re-calibrated by an experienced tuner with a program compatible to the electronics.

Boring the engine will give a bit more low end grunt and revamping the variator will change the engagement characteristic, but you will need to get a high lift cam to get back some of the top end you lose when you increase the bore. Likewise the stroker crank will boost the low end grunt wile lowering the redline RPM limit.

Have fun - engine building is great if you have the time and money - if you have the time, you might get it all done in a 2 to 4 week to month time frame. If you are going for maximum performance allow about 6 months to a year for disassembly, machining, clearance checking, head porting, recutting the valve seats for the larger valves, checking the clearance between the piston and the valves and the overlap clearance between the intake and exhaust valve (one is opening as the other is closing and they have to miss), finding an over sized exhaust system to match the enlarged exhaust port, final assembly and the dyno runs to fine tune the EFI.

Now get the variator tuned for the performance curve of the engine, possibly consider a heavy duty driven clutch assembly and a heavy duty belt.

Whew! I think I would just consider a Chinese 250 instead of all the work of building a Chinese 150 into a 160+, but on the other hand, if you have free time, go for it and let us know how it progresses
 

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Discussion Starter · #5 ·
The fuel injection is calibrated for the diameter of the throttle body, not the size of the engine - changes to the intake and exhaust will affect the fuel injection, but it will have to be hooked up to a dyno and re-calibrated by an experienced tuner with a program compatible to the electronics.

Boring the engine will give a bit more low end grunt and revamping the variator will change the engagement characteristic, but you will need to get a high lift cam to get back some of the top end you lose when you increase the bore. Likewise the stroker crank will boost the low end grunt wile lowering the redline RPM limit.

Have fun - engine building is great if you have the time and money - if you have the time, you might get it all done in a 2 to 4 week to month time frame. If you are going for maximum performance allow about 6 months to a year for disassembly, machining, clearance checking, head porting, recutting the valve seats for the larger valves, checking the clearance between the piston and the valves and the overlap clearance between the intake and exhaust valve (one is opening as the other is closing and they have to miss), finding an over sized exhaust system to match the enlarged exhaust port, final assembly and the dyno runs to fine tune the EFI.

Now get the variator tuned for the performance curve of the engine, possibly consider a heavy duty driven clutch assembly and a heavy duty belt.

Whew! I think I would just consider a Chinese 250 instead of all the work of building a Chinese 150 into a 160+, but on the other hand, if you have free time, go for it and let us know how it progresses
Thank you for the feedback! The engine has a thriving aftermarket community that has a lot of pre built kits and they are not expensive. The fuel injected model I have seems to be a slight variant than a lot of other ones out there (carbureted) For a few hundred dollars I can get pistons (with cylinder, head, valves, rocker arms, and cover), stroker crank, and camshaft included with kits. Being a 1 cylinder the teardown is super simple on a tiny engine. timing should be ok as long as i line cam up with TDC and use the markings as a guide. Feeler gage is not to bad with only 2 valves.

I have gone with the Chinese 250 at one time. It was an purchased a dealership and labeled as a go cart/buggy. It had off road tires but I had major issues with the clutch/ground clearance and decided to bring it back. The distance was too far support for that type of machine was not as prevalent as with the Polaris or name brand companies.

From scouring the internet it looks like I will be the first to attempt this type of thing......... What could go wrong?
 

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Hello all,

I would like to discuss performance upgrades for a Polaris ranger 150 EFI 2021 model. I bought the new Ranger for my kids and noticed that the ground clearance was not as advertised. I love all the new features and think it’s perfect for my kids. I recently purchased a new set of rear tires that are 14 inch rims with 26 inch tires. I have a lift kit ordered that I plan on only using the on the front end to kind of level the UTV a bit And leave stock 22 in factory tires on the front.(2 in) This has significantly increased the ground clearance in the rear by about 2 inches. (Was around 6.5 now 8.5)

I took it out with the kids on about a 30 mile ride and had no issues with him hitting anything. I did however notice that the larger tires had trouble in sand and would like now to increase the performance of the machine. After doing some searching I found a few performance clutch parts that I plan on installing. Namely a performance torque driver and clutch. I’m also getting some smaller rollers.

now I’ve been looking at big bore kit’s and crankshaft and wondering if anybody has any experience.

I can tell through research that this UTV has the GY6 motor with serial number jl1p57f. It is an a model that I verified by measuring the bolts on the cylinder head.

with the a model GY6 the largest I can safely go is the 63 inch big bore kit. Then I will have to bore out the case. I can also get a +3.5 mm stroker crank shaft that will put me at a 191 cc engine.

has anyone done any of these mods on the Polaris ranger 150? I’m specifically wondering if the electronica fuel injection is enough fuel for this size and if boring the case makes it too weak.

my kids are too small for the 570 and I really want to make this machine work until they’re old enough.

thanks for any of the comments.
im interested in anything you have found out. I put new rims and tires, and a lift kit on my kids 150. I also went with a smaller sprocket for More torque. Still trying to get a little more performance out of this thing. I think it’s something my kids could ride for a few more years. I was not as impressed with the stock performance as I thought I would be. The thing wouldn’t climb hills for nothing.
Hopefully you have had better luck finding performance parts than I have!
 

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im interested in anything you have found out. I put new rims and tires, and a lift kit on my kids 150. I also went with a smaller sprocket for More torque. Still trying to get a little more performance out of this thing. I think it’s something my kids could ride for a few more years. I was not as impressed with the stock performance as I thought I would be. The thing wouldn’t climb hills for nothing.
Hopefully you have had better luck finding performance parts than I have!
154891
154892
154893
 

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Discussion Starter · #10 ·
Sorry it’s been a while. I put a ton of performance parts on it and just got the power commander installed I can give you a list of the parts that I used but there is a caveat to it.

1. Clutch upgrade. I purchased a clutch kit for it with a higher rev spring. It now engages at about 4000 RPM which helps with turning the larger wheels that I have.
The part that I bought is right here-

And

Performance torque driver for Polaris RZR 170 ACE 150 Ranger 150 US TW | eBay

I talked to the guy andGave me the higher spring for free.

2. Oil cooler, and 170cc tadia cylinder with larger heads and a performance cam. Bought it all from


Be forewarned warned!!!! You have to remove the head and measure 2 critical parts!!!!

mine is a gy6 a block short case. There is literally 20 different variations of this motor!!! Make sure you do the work and measure before you buy! The guy at gy6 store is super knowledgeable to.

A good reference to show what yours is is here -


Stud spacing will be a definitive tell but your opening size on the case will tell you how big of a kit you can get. I had about 62.7 mm.

3. I just installed a power commander and wide band kit to control the fuel flow. Just installed it and will let you know the final results in a few weeks.

4. Windshield, roof, hard doors, and a 2 in lift. I have Purchaced 26 in tires in the back to increase clearance from the bar by 2 in. I only insIf anyone wants info on any of this I will share where I got it.

I just installed everything. I have to tune it to have results. I will post pictures and results in a few weeks.
Good luck!
 

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Discussion Starter · #15 ·
Can you please let me know the exact part numbers of everything you ordered. sprockets tries clutches. Everything please!!!!!!! I keep ordering the wrong stuff
If you contact the gentleman at the GY6 store he is an expert on these engines. https://www.gy6store.com/. As i warned in the above post there is almost 20 different versions of this engine. The only way to be sure is to take it apart as outlined in my post above. as far as clutch parts a the one i purchased is also outlined in the post above. power commander only sells 2 products that fit this.
 

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