# Top End, Valve Clearance, and Timing > This is a plain-text (markdown) copy of a page on tboltusa.com, made for AI assistants. People see the same page at the HTML link below. - **Breadcrumbs:** [Home](https://tboltusa.com/store/index.md) > [Tech Database home](https://tboltusa.com/store/tbolt-usa-pit-bike-minimoto-technical-info-database-tech-15.md) > [Pit Bike Installation Info](https://tboltusa.com/store/pit-bike-installation-info-tech-99.md) > Top End, Valve Clearance, and Timing - **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/top-end-valve-clearance-and-timing-tech-62.html) - **Markdown:** [this page as markdown](https://tboltusa.com/store/top-end-valve-clearance-and-timing-tech-62.md) - **Generated:** 2026-11-15 03:59 EST - **Site guide for AI assistants:** [llms.txt](https://tboltusa.com/llms.txt) 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 To get everything together properly on your Pitbike 4 stroke single top end heres a few tips Some Big bore kits have thinner head and base gaskets than stock With these do not use the stock "O" rings You may want to use a thin layer of Yamaha bond or honda4 semi drying adhesive Set you Flywheel to "T" mark (top dead center) then align you top cam sprocket mark to 9 o clock Valve Lash - Valve tappet adjustment KLX110 HONDA 50-70 China 50-190 Daytona 190 Adjust your tappets to .003" intake and .003" exhaust **TBPARTS NOTE:** **Valve Lash Settings for All TBparts Race Heads & Camshafts:** **Intake 0.003" & Exhaust 0.003” Note - This gap between the valve tip and rocker tip is necessary, it closes when the bike gets hot.** **In all applications regarding the use of TBparts Install the camshaft with the lobes down or toward the piston. This first step combined with aligning the camshaft timing marks and crankshaft timing marks will ensure your engine is timed properly.** Note: 2 bolt cam mounting bolt holes are offset drilled and only go on one way so it cant be 180 degrees out Torque the head to 110" lbs, run for one heat cycle then re-torque 110in/lbs is for the 50-110cc round cam cover type and Honda 50/70 6mm studs Torque the head to 140" lbs, run for one heat cycle then re-torque 140in/lbs is for the 125-150cc round cam cover type and Honda TRX90 7mm studs KLX110 and KLX head type motors ZS155, 155HO and YX 150/160 16ft/lbs ,run for one heat cycle then re-torque 8mm studs Heres is a YouTube of a guy setting his valves [youtube.com/watch](https://www.youtube.com/watch?v=HppcqVpnaFw) Special Note about TBparts KLX114 143cc kit piston TBW0377 TBparts 143cc 60mm piston part number TBW0377 that is sold in all of the 143cc bore kits has the IN marked on the smaller valve relief and it is correct. The Exhaust relief is larger because our piston was made to work with several different cylinder heads. ?Here is how to decide the piston alignment side: ![Image: https://tboltusa.com/store/images/TECH-0377-INTAKE-VALVE-SIDE.jpg](https://tboltusa.com/store/images/TECH-0377-INTAKE-VALVE-SIDE.jpg) ## 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)