Best non-BBK power mods?

[Flash]

Here is the JA65 one from Takegawa

SP TAKEGAWA : FI-CON TYPE-X [05-04-0125]

o2 sensor is behind a guard on the right side of engine head. Vertically it's just below the spark plug.

Here is the JA65 one from Takegawa

SP TAKEGAWA : FI-CON TYPE-X [05-04-0125]

o2 sensor is behind a guard on the right side of engine head. Vertically it's just below the spark plug.

Located it. Then dug in deeper. The number one cause ofvrestrictive exhaust is the catalytic convertor labyrinth. It is removable if you have a welder friend. Just at the front elbow there is a swell in the exhaust pipe anout 5 inches long. Cut off just before the last weld to reveal the little core. It then falls out. Voila way less restrictive exhaust. Mildly deeper sound. Free flowing. Yes it's not a youokshema

 

[Flash]

So the mentioned pcx150 injector seems to have multiple part numbers on amazon as well as pricing. Which unit actually fits a JA65 2024 model?

 

[Flash]

Here is the JA65 one from Takegawa

SP TAKEGAWA : FI-CON TYPE-X [05-04-0125]

o2 sensor is behind a guard on the right side of engine head. Vertically it's just below the spark plug.

Here is the JA65 one from Takegawa

SP TAKEGAWA : FI-CON TYPE-X [05-04-0125]

o2 sensor is behind a guard on the right side of engine head. Vertically it's just below the spark plug.

Located it. Then dug in deeper. The number one cause ofvrestrictive exhaust is the catalytic convertor labyrinth. It is removable if you have a welder friend. Just at the front elbow there is a swell in the exhaust pipe anout 5 inches long. Cut off just before the last weld to reveal the little core. It then falls out. Voila way less restrictive exhaust. Mildly deeper sound. Free flowing. Yes it's not a yoshemura pipe but it only cost labour time.

 

[dmonkey]

Not sure on the PCX150 injector details, but try to buy one with a Honda part number through an OEM parts vendor, or one where the reviews check out. For some reason there are knock offs.

 

[m in sc]

use an oem injector if you can.

amazon isn't a parts specialist. i de-catted my 21, it was 'ok' and def helped... but didnt do a *whole* lot. head pipe diameter was a way bigger game changer, which is why i went ahead and changed it. .

 

[Happy Campa]

You can also reduce power loss in the drive train. I had positive results when I changed out my old chain and sprockets to lightened sprockets and a Renthal non-sealed chain.

A claim I heard about and tried was to remove the snorkel off the air box. A fellow on this forum said he dyno'd a half horsepower increase. It's something. Also try aftermarket air filters, but be sure to use an EFIE! I learned this the hard way... my piston overheated on a lean air fuel ratio. ‍

The more power you produce, the more imporrant an oil cooler and high volume oil pump is.

No one has mention stock bore high compression pistons yet, although I have not tried one. I did try a big bore kit but reverted to the original for longevity sake. The piston skirts were wearing quickly.

 

[m in sc]

i did. didn't do much. the main biggest primary reason this bike is so slow is the ecm tune. -primarily the timing curve-. you can throw all sorts of stuff at it, but the biggest gain is the ecm defeat/change etc. and IMHO there isnt a reliable replacement yet, like the groms and monkeys have. -IF_ i were to really try to squeeze power out of it, i would advance the flywheel about 8 degrees and put on a standalone timing controller, that's what we do on the vintage 2 strokes when we switch to cdi, and it makes -all- the difference there. apples to oranges but yes, it can be done on here. big reason we can get 65-75 HP out of a street ridden 350cc bike that's 50 years old. (and yes, they run cool & reliably)

 

[squeaks]

i did. didn't do much. the main biggest primary reason this bike is so slow is the ecm tune. -primarily the timing curve-. you can throw all sorts of stuff at it, but the biggest gain is the ecm defeat/change etc. and IMHO there isnt a reliable replacement yet, like the groms and monkeys have. -IF_ i were to really try to squeeze power out of it, i would advance the flywheel about 8 degrees and put on a standalone timing controller, that's what we do on the vintage 2 strokes when we switch to cdi, and it makes -all- the difference there. apples to oranges but yes, it can be done on here. big reason we can get 65-75 HP out of a street ridden 350cc bike that's 50 years old. (and yes, they run cool & reliably)

Just a heads up, there's two cats in the exhaust..
The one that you see in the head pipe, but also in the muffler itself.
I did post it somewhere on here last season.

 

[squeaks]

 

[RustyRodder]

Ill second using an OEM injector- I tried an aftermarket 'PCX' and it didnt flow even close to what the stock injector can.

 

[Happy Campa]

View attachment 9092

Cool dissection!

 

[dmonkey]

To clarify, the 2020-2022 model JA55 has two catalyzers in the stock exhaust, the 2023-2024 JA65 only has one.

 

[Flash]

View attachment 9092

Yes. Thanks for all the additional information

View attachment 9092

It was mentioned by Honda the 2023 models got new muffler internals. Thanks for showing your dissected muffler. Easy to see why the primary catylic didn't change the muffler tone as much as I thought it should have. A reason to go back in there. Just finished my second fill up. On fill ups both tanks got 111mile per imperial gallon. Will see what happens on the next fill while the ECU is learning the new exhaust flow pattern. Rumor was about 75 km minimium to have it learn. Bike seems to be running more smoother with even the front cat removed. I do have a HD Sportster tapered muffler but am trying to see where I can get with keeping it looking stock for the moment.

 

[Flash]

View attachment 9092

Yes. Thanks for all the additional information

 

[Flash]

use an oem injector if you can.

amazon isn't a parts specialist. i de-catted my 21, it was 'ok' and def helped... but didnt do a *whole* lot. head pipe diameter was a way bigger game changer, which is why i went ahead and changed it. .

So did you custom build a header pipe or is there an optional part? I was tempted to try flex exhaust tubing gor the first 18inches as there are some compound small radius bends until it get up to the horizontal pre muffler portion.

 

[m in sc]

cut out the 1st one and gutted the second one. i can weld and had the tubing so just removed the front one and sectioned in a straight thru pipe. eventually i just got a whole stainless system and it works better. don't do flexible conduit tubing, thats going to be a disaster.

 

[squeaks]

I didn't think about them changing the exhaust in the newer models, perhaps they run a bit cleaner or maybe something they did early on to pass US emissions?

 

[Flash]

I didn't think about them changing the exhaust in the newer models, perhaps they run a bit cleaner or maybe something they did early on to pass US emissions?

The "Euro 5" emmisions rating required something more than the pre 2023 models. Super lean and active Closed loop engine air fuel ratio ECU. I cant read Katakana but this is what I seen on another post.

 

[squeaks]

Wow this one was running lean enough, too much so after just a de cat and opening up the intake. After some good advice on here and I add the little EFIE device boy, what a difference.
Funny because I bought a 143 BBK, Cam and finbro head,
But at this point for me I'm not seeing the need to go any further.

 

[Flash]

Does anyone have the official Honda part number for the PCX150 injector. I am very curious as to the specs on it based on the fact it is for a high compression 160cc motor.