My 15 year olds 2000 Honda 125 R had the back tire lock uo and it died and now will roll but has no compression. This is all going from what the boys have told me. Taking that info it sounds like it needs a complete rebuild.

Im no mechanic but seem to remember hearing 2 strokes are easy to rebuild. I was told to have it done would be between 1500 and 2 k.. im not thinking a 26 year old bike would be worth putting that much into. So im thinking it may be a god project to tackle and something to do with the boys. Looking up rebuild kits it looks like about 7 or 800 will buy all the parts IF im looking at the right stuff. I may need a few tools I dont have to check and se if the cylinder are round not oval from basic readi I have done.

I have been cutting back hours at work some(called in and took my last vacation day last night along with not working my day off Monday but 16 tonight. Baby steps) So with more time a project with the boys seems nice.

Does anyone know if ther is a book or video on this model with step by step guide to do a rebuild with tools and parts list for beginners? Any idea how many hours it should take to complete if starting out prepaired so I can allocate # of days off to the project if it looks like something I think we can tackle.

Any insight and info would be appreciated.

Should be a repair manual out there also consider machine shop work as a possibility cost wise.

Pretty fast to rebuild maybe two days drinking beer without any machining, I’d say a valve stuck open, pretty easy to tell take the head off and see if both are up.

If the engine turns over but no compression I would suspect something relatively simple in the head; valve broken, timing chain broken etc.. Try tackling it yourself, but I'd tear into it first.
If it actually froze up first, then turned over with no compression I would suspect bad piston and a scored cylinder.

YouTube is your friend.

2 strokes are easy to rebuild , for example , it doesn't have valves like a 4 stroke , it uses reed valves , which rarely fail.

I've changed out piston rings , new jug and head gasket on a 1 cylinder in under a half hour on a bike I had.

The lockup was probably from the piston seazing in the cylinder. Maybe not enough oil,mixed into the gas. I would expect piston and cylinder damage.