Another nice one on the 90 twin Dale 👍 Your eye for detail is amazing. The meticulous setup of the boring and the post process of honing, deburring and finishing, flatness checks are good lessons of precision. Looking forward to the final assembly. Thanks

Such a cute little bike holding some nasty traps for the unwary. Good meticulous work as usual Dale.

Another great video

Could have been caused by too tight of chain tension and jumping that little tike with a heavy adult...😮

Dale, does that case side have the serial numbers?

These videos are very inspiring to me. I’m on my 2nd project now. Both of them are stuck cos I couldn’t open the darn flywheel. I come here and see how easy it it 😭😭😭😭

Maybe the cracked case and melted/displaced seals caused by gear shafts not being stable in their case bearings. That instability would transfer damaging torque pressure into the case making it buckle and crack. Would also cause the gear bundle and crank shaft to twist and overheat. Would be interesting to see if there is run-out on shafts in the lathe. That engine was 1 minute away from zero hour!

great job dale looks like its never been down as the gearbox bearing got a lot of play could have caused the damage sure ul sort it next video please

Great progress Dale, albeit with some surprises. Such a pity about the case. Cheers, Peter.

Breaking out the popcorn

I don't think that's not an original key switch. My 78 is either on or off. Awesome to see that you're working on one of these though for sure! I absolutely love mine, although I wish it had some more power I must admit lol.. I have made mine a little quicker by installing the transmission gears out of a 74-75 YZ80, a piston and rings from the same yr YZ's, and some minor port work. I have a different carb on the way hopefully that I can make work on the old girl. Will find out on Monday. Fun little bikes regardless though. Thanks for all the great videos Dale!

Here!

Your attention to detail and precision are the best that I have ever seen! Not many machinists are as methodical as you are. You always take your time to make sure it is done correctly! Keep up the great work.

You give me hope for some of my old bikes that have been in line for several decades. Maybe I’ll get to them. Best Regards.

The 80 really is a cute little bike, being a scaled down version of its bigger brothers. Bet that would really go with a 90-pound kid on it. Can't believe the low miles and incredible shape it's in. A true survivor for sure.

Looked like pretty even wear on that one, and it cleaned up nicely. That little twin should really pop when you're finished with it.

Great video! What a fascinating little twin. Really look forward to hearing it fire up and purring as only a twin can. Keep 'em coming!

Could you sometime take a cylinder and shoot water into the different ports to show everyone that the ports are designed to direct the incoming charge to different parts of the cylinder and swirl the charge to help scavenging. Just a thought.

Another awesome one Dale, thank you for your time making these videos fella and bringing us along for the ride, it's appreciated.

Top vid again can you put a link up to the big boring head and tool you use please

Excellent video Dale, lots of detail. Those little pint pots came out great! Best wishes, Dean.

Thanks for the in depth explanation of the gear and their setup. Always good to watch craftsmanship. As ever, take care. PS looking forward to seeing another ride out on one of those beautiful old 2-strokes of yours.

Another Great video Dale. I'm sure you have probably shown this in other videos but it would be good to show as the 1st step how to make sure the head on the machine is perfectly square to the table with the Indicol / indicator just in case it would be off a little it could bore on a slight angle. Have a Great day sir.

Hi Dale, good video! I see your cars are gone; they are pretty. Rich

Thanks Dale, Always great and excellent camera placement . Cant wait to hear her purr .

great job as always dale should run sweet keep it going next video please

It's going to be a sweet little ride !

A lot of work involved Dale especially when you take the extra care to be precise. Interesting to see.

I love these videos . Itchy boots starts up again on Sunday .

2 thumbs up 4 me ol buddy, you keep wrench'en and i keep on learning...

I have to admit I always give your videos a thumbs up before even watching because there always good, learn something new on every one. Keep up the great videos. Waiting patiently for the next GT80 video haha.

I use my lathe for all cylinders and it works very well.

Love the 80

5.5 cubic inches! You'd almost need watchmaker tools.

Thanks Dale. Another great video. And the boring videos are never boring😉 Very interesting to see it done on these small barrels. Cheers, Peter.

Great job brother

Well you showed some new things on this one. On set ups. Thanks brother. I’ve got a lead on a 68 Yamaha from someone that stopped me to look at the 70 cb.

its not a boring video, its interesting. LOL

Love the shirt. Sent one to Kevin b.

Here!

Here

Hope you’re doing well Dale. What a beautiful little GT80. I could hear the bearings grind immediately. 🤣 I have an Rm465 engine like that- but it’s a good core.

i wonder how a ts 200 piston would fit in there, it appears to be veryy similar but 66mm bore.

What a cool little bike! Friend of mine from long ago had this same one! What a blast from the past. Going to really enjoy this project as it takes me way back.

Thick AF

What do you do if the centers are damaged ?

A nice clean bike. They used Philips screws on my 87 rz350.

What is torque induction?

im thinking you are rite about the switch, left should be run with no headlite ,, middle should be off and right should be run with lights turned on, just my 2 cents worth, another good vid dale, catch you on the next one...

Camera "Fish Eye" or are the front fork tubes bent to the rear?