Project V27-164

[BPT7594]

Hi. I have got myself a pretty sweet deal. A guy sells his PCX 1st gen and his performance parts, which are cheap. They look about 80% new, but that's the look. Everything else works fine. I have been dreaming about this project for a long time, meeting this guy helps me finish it a lot sooner.
I confess. I have an Air Blade 125i, which is a Click 125i, which is a dumbed down PCX 125i but the engine is the same so I guess it's interchangeable (it's 100% interchangeable). My aim is to finish the project with the racing gear set (45/15) from Yuminashi, that's the ultimate goal.

Now the goodies.
1/ 31mm Throttle body and manifold set

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It's a little old looking but it works fine, because of its look I can get it for cheap. The guy has a CBR150 throttle body on sale too, but it's new and costly.

2/ 60mm cylinder kit from the PCX 1st gen, it fits an esp just fine, slight difference in the cylinder base gasket, no big deal.

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I have also gotten a Torque Control Variator, when it arrives I'll take pictures and compare with the stock PCX variator.

That's it for now, more parts on the way. Cheers.

[nedla]

hi BPT,
what is your email address?

[BPT7594]

You can contact me at bpt7594@yahoo.com

[Jge64]

Excellent! Let us know.....

[BPT7594]

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Excellent! Let us know.....

Sure , more chance for me to show off my scoot .
One bummer today though. If you're thinking about getting the Kitaco 51 tooth gear, think long and hard about my friend's experience.
He installed it in his PCX esp 125. which changed the gearing from 53 to 51, final drive ratio down from 10.55 to 10.15 to gain more top speed and to smooth out the engine a little bit.
However, the kit seems to not fit his other gears. Had 20km on it and it kinda howls, more and more, so I sincerely advise you guys to think again if you have an esp gear set, be careful, 55$ down the drain is a pain in the a**. I don't know why but I thought Kitaco would have thought about this if they make that 51 tooth gear to match a 17 tooth counter gear, not really sure. He had to remove the gear tomorrow and switch back to stock gears with the potential damage to his other gears.
So, be careful and think about my friend's experience.
Here's the gear. Must be some oddity but I think this should be an example of Murphy's law, something that can go wrong, will go wrong.
Cheers.

[BPT7594]

I had to take the piston out and show it off a little.
It's a Yuminashi 60mm piston. It's not a forged piston, at least not according to Yuminashi since they did not mention it.

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The piston is very light though, and you want as light a piston as possible, to not waste the work needed to push it down. I currently have a Sonic 58mm piston and it weights more than this one so big plus for Yuminashi there, if it's a forged piston then it can be even lighter and even more reliable especially for such a high compression ratio (12.8 according to Yuminashi). You can clearly see there's carbon deposit on the top of the piston, no worries. This kit has 6000km on it so I don't need to change the rings, would be better but I'd rather spend my money elsewhere.

This is a closer look at the throttle body and manifold. I'm 95% sure it's a CBR150 throttle body which was mirror shine polished by Yuminashi. The guy I bought it from has modified it a little to make it fit his PCX 1st gen and from the outside it looks a little dirty so I got it for crazy cheap, throttle body and manifold about 70$, that's his asking price. I was shocked since it works just fine. To put it on my scoot it will require a wire loom, but I already ordered it, so more pics on the way.

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P/S: The Blackberry Passport makes truly amazing macros, but only for macros though, other shots are terrible


If you want to have a forged piston then there's a 61mm (170cc) kit from Taida in Taiwan which is very well made and pretty cheap, with a ceramic plated cylinder wall and a forged piston (at least according to Taida), they make big bore engine parts for GY6 engines and are quite popular. I have observed a kit up close but did not have the chance to take pics.
Here's some promotion pictures.

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I'm waiting for my CBR150 fuel injector, which is the A type high performance fuel injector from Yuminashi. At least they look exactly similar, I'm not sure if there's tricks you can do to "enhance" an injector or not but I can get the CBR150 fuel injector for cheaper then it's worth a try. Also waiting for my full Sonic 125 double valve spring set, I don't have a Yuminashi camshaft now but I figure I'll just be careful to install the double valve springs since I'll take my cylinder head out anyway.
I'm also getting the new Torque Control Variator from Yuminashi, Reggy personally guaranteed that with such a setup I'll get 150km/h, let's test that claim haha. I weigh in at 90kg (198 pounds for you americans, you and your imperial system ), so while it may reach 150km/h, I doubt I'll need a lot of open road.
Much more pics to come.
Cheers.

[Pcxdemon]

I like the throttle cable mod. What's a total length up to the weld and Also what the third screw for?

[BPT7594]

I'll measure it when I got home. I'm not really sure why he had to modify his throttle cable. I'll ask his mechanic (who happens to be mine too) about this.
He did have to shave a bit of metal on the top of the throttle body. Because originally it's for the manifold of the CBR150 and the fuel injector. The pcx v1 has a metal thingy that touches the throttle body so he had to shave it off.

[BPT7594]

I did try the Yuminashi inertia power booster.
I cannot update the pictures though. The forum won't let me update pictures more than 1440 wide.
The results exceed my expectations. It's noticeable. My engine does rev lower at almost any rpm, especially at a high speed. Take off is good too. I did not modify it, installed as is at 434 grams. the most noticeable loss of any kind for me happens at mid acceleration. But it passes very quickly, I guess you have to have a high revving from the start (light weight rollers) to help spin this thing up to a certain speed to have an effect.
The scoot is much smoother now. Very satisfied with it.
Personally I do recommend it. be sure to install with it slightly lighter rollers or better yet a performance vario.

[waspmike]

Me again:-) Customer just installed a variator as I said just now in another thread . http://hondapcx.org/viewtopic.php?f=9&t ... 114#p76114 That type of variator has been critcised for being heavier than stock but actually comes , if you like, complete with the extra weight of an innertial power booster built in and was designed that way from the outset to be used with std spring and std belt.

What one uses depends on what results one wants.

[BPT7594]

I have not and never have tried any variator that is heavier than stock really. If I have it on my hands yeah I'll be more than happy to test it and if it does turn out be great, it's great. I run a modified SH150 vario btw, i think my mech changed the angle or anything, I'm not sure about the effect of it, about the 130km/h, that's with a lot of open road and a rev limiter removing tool (at least I think so). The tool makes my scoot run too unstable so I removed it, learned it the hard way too that no way in hell the stock valve springs can handle even near the redline, I was crazy enough to push it hard though, currently waiting for my engine rebuild because I think my springs never recovered from that one time of abuse.
Again, just telling my experience here, I'm new to this forum so there's a lot I haven't tried yet. If I know that vario, I can find out if I can try it and be more than happy to do a test run and review, just found an amazing test road.

[waspmike]

I have not and never have tried any variator that is heavier than stock really.

Well you sort of have. As now your rotating mass has been increased by the adition of extra weight

[BPT7594]

I have not and never have tried any variator that is heavier than stock really.

Well you sort of have. As now your rotating mass has been increased by the adition of extra weight

Yeah I mean until now haha, still not dare to abuse her too much though. That one time really destroyed my valve springs. . wish I know about the springs you told me sooner.

[BPT7594]

Got some goodies today. Both from Honda and Yuminashi.
1/ Stock cylinder head.

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2/ Stock intake valve (27mm)

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3/ Stock exhaust valve (22)

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3/ Stock torque spring, as recommended by Reggy to go with the Torque Control Variator

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4/ Stock cam, I'm waiting for my replacement camshaft from Yuminashi.

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5/ The Yuminashi Torque Control Variator, comes with 1mm shorter stock pulley boss, 10gram rollers.

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6/ Big tube air intake, I figure I'll just get it from Yuminashi anyway.

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7/ B type to A type wire loom, again, easier to just buy from Yuminashi

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8/ 5 pin to 3 pin wire loom for the Click125i/AirBlade125i, not needed for the PCX 125

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9/ Gasket set with the 0.3mm thin copper head gasket from Yuminashi

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10/ Yuminashi Inertia Booster. I got this for my friend, I already have it.

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I did tried the Yuminashi variator. 10 grams were too light, so I dropped in my 12 gram rollers. The 1mm shorter boss does not fit my driving style too so I dropped it and use the stock boss. Perfect. I have to say my scooter has too much torque now, wheelie on the throttle control is possible, I did lift my front wheel a little but since I destroyed my valve springs I dare not WOT anymore.
The surface of the yuminashi variator is not as shiny as their old Speed Control one. It does not have separate ramps with different angles either, or at least I think so. The surface inside is weird though. It's rough. I think they do this to keep the rollers from going out too fast, but with this kind of rough surface I don't expect my rollers to last too long though. But I can change my roller every 2000km or so, rollers are cheap here anyway .
One thing I do worry about is my belt. I did not get the Gates belt, I use my stock one which has 8000km on it. With the extra squeezing and everything I really hope it's okay. When I have enough stuff to rebuild my engine I'll take it out to check, I have a new stock belt sitting in my garage, maybe I'll be careful and install it then.
The only problem I have with this variator is perhaps the inertia booster itself. Too much torque results in some dropped acceleration, but the scooter is very smooth, RPM changed fast but gradually, not suddenly. I hope I can machine the inertia booster a little though, because without it the scooter lacks some punch, with it, acceleration can drop a little. Maybe 350 or 300 grams will be enough, but I'll restrain from doing that until I rebuild my engine.
The feeling I have with this torque control is very good. There is torque at all RPM, I must say that, and a lot of it. Whenever you twist the throttle, there's more torque, but I did not check this above 80km/h though, no road to test and the valve spring thing. So this will be updated.
That's it for now. I'll update when I get the Sonic springs and the CBR150 fuel injector.

[nedla]

thanks for the pics and updates, wow there is torque in all rpm ranges? I can say my stock one have lesser torque in the low rpm, good torque in the mids and lack torque in the higher rpm onwards, it just feel can't go on anymore...

[BPT7594]

Update with the variator.
I did a test run. Turns out 12gram was too heavy and the engine runs into overdrive too soon with the stock torque spring.
I drop in a new pcx v1 belt as recommended by reggy and my mechanic. The take off is somehow weaker but obvious increased acceleration. 10 gamr is now the way to go.
There's some rpm range that the engine kinda vibrates a little under 20km/h. Think it's clutch slippage but not too sure

[waspmike]

The Yuminashi Torque Control Variator, comes with 1mm shorter stock pulley boss

Will you measure the stock one for me? The old V1. PCX 125 is 47.5mm. Some performance variators come with longer ones.

[BPT7594]

Stock one is 47.5mm. I am using kitaco dlc boss it s also 47.5mm long. I think the shorter pulley boss is for top speed and lower rpm. If I want I can install a washer to see how it goes. Yuminashi boss is 46.5mm

[waspmike]

The boss that comes with the variators I have is 50mm and still gets better top speed 120+ stock and cruises at lower RPM.

I think it is all to do with geometry:-)

[BPT7594]

I don't think installing a 50mm boss might be a good idea on my scooter. The crankshaft shaft does not allow it. I won't be able to put the starting crank gear on the shaft because the ramps on the shaft is very short. Might be wrong though.