Turbo 125 PULSAR

[KymcoKDG]

Does anyone here know where I can get a turbo that would fit my 125cc Kymco Pulsar ?
If anyone has any experience in doing this, help would be appreciated! thanks

[CROSSBOLT]

Interesting project. Don't know if anyone makes a turbo that small. I do know Garrett makes a small turbocharger that the Harley customizers use but that's in the range of 50 to 100 cubic inches. Yours is 7.5 cubic inches! I will bet there is a ton of info on the internet about turbocharging and hardware. So far no one here has said anything about it so you will be the pioneer! That should last until you see the price tag on a purpose-built turbo by Garrett!HomeProductsEV / HybridSupportAbout UsCareerFAQContact Us

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Small Engine Turbo (RHB31 VZ21)


Small Engine Turbo Charger - RHB31 VZ21


This is a copy of IHI RHB31 turbocharger, the world's smallest turbo. We notice there are a lot of interest in the aftermarket to convert a natural aspired small engine to turbo charged. While the genuine RHB31 turbo is not easily available to the aftermarket, we carefully source a copy of it from an established manufacturer. Let's be honest: this copy may not have the same quality as the genuine one, but it is fairly well built and we provide tech support and customer service for it. 

This turbo is a good choice to turbocharge the small engine on your motorcycle, scooter, dirt bike, ATV, go kart, buggy, and snowmobiles. This turbo works well with our turbo version of small engine EFI kits. Together, VZ21 turbo and our EFI conversion Kit would match perfectly. With one stop shopping, you can get a turbo and an EFI system to convert your small engine from carburated to turbo-charged and fuel injected, with no worry about issues on forced air induction with a carb. 

Note: this turbo is suitable for 125cc to 600cc engines. Engines that are too small would not have enough air flow to push the turbo to generate meaningful boost. 

Click Here for our Small Engine Fuel Injection Kit for Turbo 

Small Turbo related documents:
ECOTRONS Turbo VZ21 technical spec 
ECOTRONS Oil pump technical spec 
ECOTRONS Oil cooler technical spec 


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Small turbo Auxiliary parts


Turbo assembled with the accessories


Oil pump


Oil cooler

Small Engine Turbo (similar to RHB31 VZ21) @ $349 USD

Oil pump $59 USD

Oil cooler $39 USD

Accessories (flanges, gaskets, oil inlet/outlet fittins, fixtures) total: $89 USD

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[JJJoseph]

Does anyone here know where I can get a turbo that would fit my 125cc Kymco Pulsar ?
If anyone has any experience in doing this, help would be appreciated! thanks

Check the Honda Ruckus builders.  They like turbo'd GY6 engines like yours:http://www.sub5zero.com/sites/default/files/uploads/2012/05/IMG_8579.jpg

[CROSSBOLT]

Check the Honda Ruckus builders.  They like turbo'd GY6 engines like yours:http://www.sub5zero.com/sites/default/files/uploads/2012/05/IMG_8579.jpg

Now that is HOT!

[Tromper]

Kinda on the way out the door in a few here, but got intrigued and did a quick google for VZ21.
Saw a few options on Amazon, but crossbolt's was the only one noted for engines that small..
 http://www.ecotrons.com/products/small_engine_rhb31_vz21_turbocharger/  is the link I believe.

Kinda intriguing, not sure how I'd mount it but could be fun on my blue SYM.

[CROSSBOLT]

Personally, I did not think such existed! Shows what is available. That thing I sent was supposed to be a link. Looks like I sent the whole library!

[KymcoKDG]

Thanks allot for the helpfull info .
I already ordered a knock off of a RHB31VZ21 turbo now just waiting for it to arrive. Next up is to reduce the compression ratio by fitting a thicker head gasket. Does anybody know if there are thicker gaskets available ? And i havent seen any openings to run my oil lines to the turbo and oil cooler . Has anybody here placed an oil cooler on one of these ? Thanks allot evryone ill be posting pics of the build as we go . Lets hope it all goes well!

[KymcoKDG]

the parts are in and the engine has been overhauled. A few broken gears and and bearings prevented me from shifting into 3rd .
If anybody knows a good thickness for a thicker headgasket please feel free to share. The standard size is 0.3mm i was thinking of placing one thats 1mm thick.
Is this too much ? not enough ? all help is welcome.
 

[CROSSBOLT]

Work out the volume of that "disk" 1 mm tall diameter what ever the bore is. Then use the claimed compression ratio and figure what that 1 mm x bore volume does to reduce the compression ratio. Better yet, decide what ratio you NEED for the turbo to work at maximum boost so the engine won't destruct. At least right away... I think you will decide to use a waste gate to regulate the boost as the easiest way to avoid over boost. Like most other engine designers and builders. Also consider the limit of how far you can "jack the head up" to reduce compression ratio since the cam is chain driven. See, whole buncha stuff involved, ain't it?