Picking up a speedo-healer (like the SRD-H9) is an easy install to correct that speedometer. You're right, the 14T will help get you a bit more power to the wheel throughout the powerband, but you're not going to see a lot of help on the top end with this alone. The monkey will definitely want to pull off the line a lot quicker with that smaller sprocket, though.
You will absolutely not increase top speed with the 14 T front sprocket. You will increase torque in the lower and mid range and get closer to the rev limiter. At top speed you can expect the speedometer to be off as much as 7%. You will need a speedo healer or the Takegawa replacement DN meter (absent using a phone GPS). Check out gear commander's website if you are interested in the facts.
Apio Thanks for your feedback. How is the phone GPS accurate in a car, but not on the Monkey? That doesn’t make sense. Top speed was for sure increased with this mod as the power in 3rd and 4th became more useable. 4th gear did nothing before the mid. Thanks for watching! I personally found the “% off” varied from 3% to 5% depending on speed. - Kyle
@@manybikes It’s just under 7% off with the 14t sprocket (you’re taking 1 tooth out of 15, which means you’re reducing your actual speed by 1/15th, or 6.67%). If 60 mph is indicated, you’re actually doing about 56. Multiply your indicated speed by 0.93 to get your actual speed.
Sorry Apio... I have changed sprockets on my new Monkey, an original Honda z50, multiple CT70’s...and my speed measured before and after via a GPS has been increased on every single one of them. 100% a fact.
Look at the monkey horsepower curve. Getting closer to the rev limiter (although in 4th you're still nowhere near close) is the whole point, the (stock) monkey doesn't make full horsepower until it's at least 5500rpm. Stock sprocket doesn't put you there.
Hi nice test ! Did you test the real speed with GPS ? Changing the front sprocket does change the speed on the odometer… On my Grom I changed for a 16 front sprocket : I reach the same final speed but 1000 rpm lower !
I wonder if a similar mod is available for a Yam XT250? I would love a higher top speed, plus it would be nice if my bike could actually have a lower minimum speed in first. It is hard to creep along on the 250 when I need to.
Hi kyle.what did you do to actually get that sprocket on shaft.when I tried to put sprocket on it would only go on a little way.did you tap it on all the way with a hammer?I bought another one to see if I got a bad one.any suggestion on how you put it on.the cut on stock one goes on easily.thanks mike
Newbie rider here trying to understand. The original Sprocket is 15T and you changed to 14T. That will increase higher top end speed but you will lose some torque (assuming every things else is stock). Is my understanding correct?
Francis Ho thanks for watching! Actually the monkey 15T to 14T to gain top speed is NOT typical. Here is a video I made with my friend Travis that really breaks it down: ruclips.net/video/3jGdmbq6Ajw/видео.html With the Monkey I wasn’t able to use all the motor power in 3rd gear and 4th acted as an overdrive. Lowering the gearing on the monkey allowed 3rd and 4th to have more torque and allowed it to use the power. - Kyle
Just got my monkey, been looking forward to making this upgrade. But, when I follow the link, the Monkey (z125 i think?) model does not show up. What am I doing wrong?
loadblock49 what!? Going 50mph when the throttle is pinned open? Yes... it was a test of patience commuting daily 50 miles on the Monkey. Knowing the 1 hour 10 minute +/- ride could be 20 minutes on the “big bike”... it was fun though!!!
Picking up a speedo-healer (like the SRD-H9) is an easy install to correct that speedometer. You're right, the 14T will help get you a bit more power to the wheel throughout the powerband, but you're not going to see a lot of help on the top end with this alone. The monkey will definitely want to pull off the line a lot quicker with that smaller sprocket, though.
Unknown Overland it was installed AFTER I installed the Yoshimura Race Series Pipe - that helped for sure!
You will absolutely not increase top speed with the 14 T front sprocket. You will increase torque in the lower and mid range and get closer to the rev limiter. At top speed you can expect the speedometer to be off as much as 7%. You will need a speedo healer or the Takegawa replacement DN meter (absent using a phone GPS). Check out gear commander's website if you are interested in the facts.
Apio Thanks for your feedback. How is the phone GPS accurate in a car, but not on the Monkey? That doesn’t make sense. Top speed was for sure increased with this mod as the power in 3rd and 4th became more useable. 4th gear did nothing before the mid. Thanks for watching! I personally found the “% off” varied from 3% to 5% depending on speed. - Kyle
@@manybikes It’s just under 7% off with the 14t sprocket (you’re taking 1 tooth out of 15, which means you’re reducing your actual speed by 1/15th, or 6.67%). If 60 mph is indicated, you’re actually doing about 56. Multiply your indicated speed by 0.93 to get your actual speed.
Sorry Apio... I have changed sprockets on my new Monkey, an original Honda z50, multiple CT70’s...and my speed measured before and after via a GPS has been increased on every single one of them. 100% a fact.
Matt L thanks for your real world feedback!
Look at the monkey horsepower curve. Getting closer to the rev limiter (although in 4th you're still nowhere near close) is the whole point, the (stock) monkey doesn't make full horsepower until it's at least 5500rpm. Stock sprocket doesn't put you there.
There is one thing to watch out for, more speed means less thrust and vice versa. This is an equation from which there is no escape.
Mohssine Maddah Very true... Very True!
Hi nice test ! Did you test the real speed with GPS ? Changing the front sprocket does change the speed on the odometer… On my
Grom I changed for a 16 front sprocket : I reach the same final speed but 1000 rpm lower !
Yes, on GPS. Super fun!
great video sir, the results surprised me. did you verify that 69mph with your phone?
Yes I did! Both via my phone and a Garmin GPS. NOTE: I am also running the Yoshimura Race full system... That helps!
I wonder if a similar mod is available for a Yam XT250? I would love a higher top speed, plus it would be nice if my bike could actually have a lower minimum speed in first. It is hard to creep along on the 250 when I need to.
For sure! The creeping would require this Mod and the higher top speed would require a Mod in the opposite direction. Thanks for watching!
Hi kyle.what did you do to actually get that sprocket on shaft.when I tried to put sprocket on it would only go on a little way.did you tap it on all the way with a hammer?I bought another one to see if I got a bad one.any suggestion on how you put it on.the cut on stock one goes on easily.thanks mike
It goes on super easy! Check this out: ruclips.net/video/NyGKzwM50gk/видео.html
Newbie rider here trying to understand. The original Sprocket is 15T and you changed to 14T. That will increase higher top end speed but you will lose some torque (assuming every things else is stock). Is my understanding correct?
Francis Ho thanks for watching! Actually the monkey 15T to 14T to gain top speed is NOT typical. Here is a video I made with my friend Travis that really breaks it down: ruclips.net/video/3jGdmbq6Ajw/видео.html With the Monkey I wasn’t able to use all the motor power in 3rd gear and 4th acted as an overdrive. Lowering the gearing on the monkey allowed 3rd and 4th to have more torque and allowed it to use the power. - Kyle
Is it ACTUALLY going that fast? I installed this front sprocket, definitely accelerates WAYYY faster, but I'm not sure the top speeds are accurate.
GPS had me tracked at 3mph less. So... Right at 70ish. Super fun!
Just got my monkey, been looking forward to making this upgrade. But, when I follow the link, the Monkey (z125 i think?) model does not show up. What am I doing wrong?
The only option they give in this link for Honda is the CRF 150, 15 tooth
Interesting. The 14 Tooth Sprocket part number is JT249-14 and you can find it just about anywhere. - Kyle
I wonder why there is such a disparity between top speeds people are getting on these. I’m 6’ 210lbs and mine does 60mph stock.
That is a great question. I have wondered the same.
Do you have to update the speedo ???
Yes. An update to the speedo will give you a correct reading. I was able to get it to roll 72 mph via GPS speed readings.
It's insane how your state let Lane splitting legal.... That's just suicidal.
Better than getting rear ended though!
Isn’t the speedometer no longer accurate after a gear change?
I guess that would depend on where the speed sensor receives its data source (or input). If coming from the rear wheel, it would still be accurate.
Yes. Ian get the speedo yo to 72 mph while my GPS speed reads mid to high 60’s. It’s only off like 3 to 5% - and that varies on speed.
On the monkey, where does the speedo capture data? Anyone know?
Dan Coleman, I would be curious about that too!
@@dancoleman1269 It's connected to the gearbox.
That’s gotta be tuff when you own an 1190🤷
loadblock49 what!? Going 50mph when the throttle is pinned open? Yes... it was a test of patience commuting daily 50 miles on the Monkey. Knowing the 1 hour 10 minute +/- ride could be 20 minutes on the “big bike”... it was fun though!!!