Vader 125 Engine Internal Specs

Lucas@Air_Lift · 06-29-2017, 11:11 AM

After about 200 miles of riding the Vader, I am really itching for more power. The bike struggles to maintain 50mph going up big hills with my 250lb self. So I decided it would be a good idea to start a new thread outlining the engine specs for anyone looking for more power through a high comp piston/big bore kit/race head. What I've gathered so far without taking the engine apart:

Engine: BD 1P54FMI
Piston Diameter: 54mm
Wrist Pin Diameter: Unknown (someone please chime in!!)
Stroke: 55.5mm
Cylinder Jug Height: 78mm
Head: Appears to be a big valve YX head (similar to YX140)

It appears a TBolt USA Big Bore kit for a YX124cc engine should work, as well as the Race Head for the same engine. I am unsure if the head is, in fact, a big valve head. I know a few people have taken them off so hopefully someone measured the valve and combustion chamber size!

Please share any info you guys have on this topic here and I will update the first post

Rangerscott · 06-29-2017, 12:16 PM

Gotta know the stroke, piston pin size, type head needed. I'd compare the cost and time doing all tgis to the stick engine to buying a 160cc or bigger engine.

06-29-2017, 11:11 AM	#1
Lucas@Air_Lift Join Date: Mar 2017 Location: Lansing, MI Posts: 61	Vader 125 Engine Internal Specs After about 200 miles of riding the Vader, I am really itching for more power. The bike struggles to maintain 50mph going up big hills with my 250lb self. So I decided it would be a good idea to start a new thread outlining the engine specs for anyone looking for more power through a high comp piston/big bore kit/race head. What I've gathered so far without taking the engine apart: Engine: BD 1P54FMI Piston Diameter: 54mm Wrist Pin Diameter: Unknown (someone please chime in!!) Stroke: 55.5mm Cylinder Jug Height: 78mm Head: Appears to be a big valve YX head (similar to YX140) It appears a TBolt USA Big Bore kit for a YX124cc engine should work, as well as the Race Head for the same engine. I am unsure if the head is, in fact, a big valve head. I know a few people have taken them off so hopefully someone measured the valve and combustion chamber size! Please share any info you guys have on this topic here and I will update the first post __________________ *Convert your engine to Electronic Fuel Injection* Trail: 07 Coolster: Lifan 1P52FMI, PZ26 carb, red bars, CNC throttle, "Metal Mullisha" plastics (the GF's bike) 16 SSR SR125: PZ26, New Racing CDI, Blue plastics, LED headlight Street: 16 Boom Vader 125: Microsquirt EFI conversion, HID/LED headlights, 17T front sprocket, O-Ringed Gold chain, adjustable rear damper, The DD
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06-29-2017, 12:16 PM	#2
Rangerscott Join Date: Sep 2016 Location: Texas Posts: 165	Gotta know the stroke, piston pin size, type head needed. I'd compare the cost and time doing all tgis to the stick engine to buying a 160cc or bigger engine.
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