# Running Condition

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This is an article from the TBolt USA Tech Database, the store's free online library of pit bike technical info. The text below is the article as written.

## Article

`RUNNING CONDITION Please got thru these steps: Engine and Carb quick check list: https://tboltusa.com/store/tech.php?pID=88/Engine+and+Carb+quick+check+list To Check Valve lash (Tappet adjustment): https://tboltusa.com/store/tech.php?pID=62/Top+End%2C+Valve+Clearance%2C+and+Timing Jetting guide: https://tboltusa.com/store/tech.php?pID=61/Simple+Guide+to+Jetting Most of the time you can tune new bikes in with the needle and brass screw adjustments and not need to change jets Tims TB20 jetting tech:The 20mm ShengWay carb is relatively easy to tune right out of the box.It comes with the #89 main and a #35 pilot jetbaseline setting:I use the #90 or #92 main jet, the #38 or #40 pilot jet, set the jetneedle e-clip in the 3rd or 4th notch from the top, and the air screw at1-1/2 to 1-3/4 turns OUT from seated. Make the necessary air screwadjustments IN to richen it a 1/4-turn at a time and see what the bikedoes. With some of the carbs, I've run it to within a 1/2-turn of beingall the way IN to get rid of 98% of the off-idle hesitation.You might have to raise or lower the clip on the needle, depending uponyour altitude,I'm at sea level.Also be advised that the above settings are for use with an aftermarketor bigger valved head, not the stock head.You might want to try the stock carb jetting first, due to the smallerstock head intake port.`

## Tech Database sections

- [Tech Database home](https://tboltusa.com/store/tbolt-usa-pit-bike-minimoto-technical-info-database-tech-15.md)
- [Pit bike Buying and Ownership info](https://tboltusa.com/store/pit-bike-buying-and-ownership-info-tech-98.md)
- [Pit Bike Wiring Info](https://tboltusa.com/store/pit-bike-wiring-info-tech-56.md)
- [General Motorcycle Maintenance](https://tboltusa.com/store/general-motorcycle-maintenance-tech-95.md)
- [General Motorcycle Troubleshooting](https://tboltusa.com/store/general-motorcycle-troubleshooting-tech-97.md)
- [How Things Work](https://tboltusa.com/store/how-things-work-tech-115.md)
- [Identifying Parts, Bikes, and Engines](https://tboltusa.com/store/identifying-parts-bikes-and-engines-tech-96.md)
- [Parts Diagrams and Breakdowns](https://tboltusa.com/store/parts-diagrams-and-breakdowns-tech-120.md)
- [Pit Bike Installation Info](https://tboltusa.com/store/pit-bike-installation-info-tech-99.md)