Street Legal Dirt Bike 2002 XR100 Top End Engine Rebuild Part 1

Join us as we show you the step-by-step process of rebuilding the top end of a 2002 XR 100 street legal dirt bike. This project will involve disassembling the engine, inspecting the components, and replacing any worn or damaged parts. Stay tuned for part 2, where we will reassemble the engine and get this XR 100 back on the road. Don't forget to like, comment, and subscribe for more motorcycle maintenance and repair videos!
FULL BUILD PLAYLIST • $400 Honda XR100r Rebu...
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[@MotoVated207]

Link to the full build series kzbin.info/aero/PLIN6s_PxF9hrgnkuwWswB4_ZWTuStoW1z

[@davidbegor8709]

Ah, engine work. Love it. Just watched a video of a 327 tear down. Rebuilt at one time with all ring gaps including oil scrapers indexed all in one line! 🤔 Every piston. Quality!😖

[@MotoVated207]

I remember my dad telling me stories about that back in the day about someone he knew that did that. What a bummer that must be when you realize your mistake.

[@jimmacsuga2592]

Great job, Brandon!!! Fun project.

[@MotoVated207]

Thanks Jim! This was a fun project!

[@chadriddle3517]

Great video !

[@MotoVated207]

Thanks for the visit!

[@frasermacmannis614]

Well done, great stuff!

[@MotoVated207]

Thank you kindly!

[@Tubeagrutis]

Love it! Can't wait for part 2

[@MotoVated207]

Thanks man! Yah this was a lot of fun. Part 2 should be out this Saturday

[@PilotMcbride]

Nice job so far Brandon. Interesting storage spot for your “leakage plug” or …… 😂😂😂 (no butts about it) Bikes are built to such tight tolerances these days, as soon as I saw the cylinder walls, yeah, I knew a new one would be ordered. Hope your weather is behaving, we’ve had hi 30s - mid 40s for the last month, with 1 day in the 20s. Cheers ol’ pal.

[@MotoVated207]

Thanks buddy! Yah it needed it for sure. We have had a VERY mild winter. I've only used the snowblower 3x and I don't think we are supposed to have anymore snow...which is OK with me!

[@PilotMcbride]

Quick reminder mate, our temps are Celsius 😂😂😂 Been bloody hot down here

[@MotoVated207]

LOL I forgot. It's been unusally warm here (above 32 C) which is unusual for us. But it far from hot here LOL. @@PilotMcbride

[@viniciuswiermann3010]

A good machinist can rebore that cylinder easily, it will increase the diameter, so you or the next person who assembles it will need to use a 0.25 (13102-KN4-A60) piston instead of the std. But I believe that it is a good idea, you can even sell the cylinder to mitigate the price that you'll end up paying on that new cylinder or save it for the future!!

[@MotoVated207]

I'll probably end up saving it. I think I only paid 190 bucks for the new OEM cylinder shipped to my door.

[@copperdog6393]

bbr big bore kit

[@MotoVated207]

Honestly, I think big bore kits have their place, but I'm not a big fan. My thoughts are that whenever you add mass or added compression to a stock rotating assembly, you are decreasing its lifespan and reliability.

[@copperdog6393]

Also you were talking about lapping the valves of supposedly they have a hardener on the valve seat so you're not supposed to

[@copperdog6393]

@@MotoVated207 and when you put the motor back together where the cam sits in the cavity, make sure you fill that up with oil because it takes the oil pump a little time to pump up in there

[@MotoVated207]

They do have a special coating on them. I lapped them per the service manual. The manual instructs to lap the valves and seat after checking with Dykem.

[@mrkattm]

Why get a new cylinder? Can't you get an over sized piston? Much cheaper

[@MotoVated207]

You still need to hone it to get rid of the damage then hope that its somewhat round when your done then hope that you measured your bore correctly and ordered the right size piston. For $190 bucks i get a brand new OEM cylinder thats perfectly matched to the std. OEM piston and ready to bolt on. Avoiding those issues and having a brand new OEM top end is well worth the additional expense in my opinion. It's pretty fool proof and you haven't changed the displacement which also means no carb tuning. Everything remains stock.