Product Description
PIRANHA 125cc Pit Bike Engine
Kit includes:
- 22mm Mikuni Carb
- Coil
- Wiring harness
- CDI
- Kick starter
- Shifter
- Intake Manifold & Gaskets
- 4-Up Gear Pattern Engine
Engine
| Displacement | 124cc |
| Engine Type | Air Cooled, Single-Cylinder, 2-valve, 4-stroke |
| Bore/Stroke | 52.4mm x 57mm |
| Final Drive | Chain |
| Fuel Delivery | 22mm |
| Fuel | Unleaded / 93 Octane |
| Recommended Engine Oil | 10W-40 Petroleum Based (Non-synthetic) |
Ignition
| Kick Start | Yes |
| Electric Start | No |
| CDI | Yes |
| Auxiliary Output | Yes |
Transmission
| Transmission | 4-Speed Manual 4-Up |
| Shift-Pattern | Four-speed Transmission: N-1-2-3-4 |
| Clutch | Rear 5-Plate Manual |
Starting pit bike engines will take some practice. All pit bike engines have relatively high compression ratios and require a "quality over quantity " approach in order to ensure quick start ups and avoid mechanical mishaps. It is important follow this routine the first few times when first attempting to start your bike.
- Slowly kick engine over until the kick start reaches a compression stroke (the point in which the kick start lever is hardest to push down.)
- Slowly continue to press the kick starter until the engine rotates slightly through the firmest point in the compression stroke.
- Allow the kick start lever to return back its top rest position
- With a quick and balanced motion - Move down forcefully on the kick lever. These motors need a strong, quick kick to get started.
- If you fail to follow this procedure, especially with longer stroke engines or 125cc + bores you can cause serious damage to your crankcase, clutch and transmissions assemblies!
Tips to Avoid kickback
- Hold onto the crossbar pad with your throttle hand while kicking the bike over to avoid twisting the throttle open by accident
- Before start up - turn the idle screw on the carburetor in a turn or 2 (turn the screw back out to normal idle setting once running.)
- Use a digital CDI with variable ignition timing at start-up, this will help reduce kick back and allow the bike to start much easier compared to the stock CDI unit.
- If ignition timing is adjustable it should be adjusted to the minimum
- Furious, repeated kicking will not get the engine started - firm, full stroke kicks are the only way to get them to start first kick, every time "Quality over Quantity"
- Throttle must be completely closed when you kick the engine over or it will kick back EVERY TIME.
- A small blip of the throttle maybe used when the engine is hot if required but NO more than 10 ° opening of the throttle in any case
R-H1
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Huge upgrade for xr70
Put this on a bone stock xr70 to learn a manual trans, it rips so hard now. Outruns a yx160/z50r and 65 2 stroke no problem. Plenty of power in every gear. Perfect power level for this size bike. starts and runs just fine out of the box.
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Great motor
Have 2hrs on motor so far with out any trouble and comes with every thing to get u going.
