IDK...never looked that closelyThat's a lot of zeros. I hope that doesn't equal the amount of butt calluses.
I dunno, CJ...when I began this adventure, I ordered the 137 tune and that choice was based on some educated assumptions. The goal was 55-60mph, riding two-up, ascending a 10% grade, (which translates to 75-80mph on the flat, sans passenger) while retaining as much of the stock durability/longevity as possible. At the time, the 62mm crank was in the prototype stage, otherwise I'd have gone for 160(ish) configuration. I went at this like an OEM engineer. The stock lump in this bike was more of an afterthought, as the bike was intended to be nothing more than a "beater"...the one that got taken to swap meets, thrown-in amongst camping gear, otherwise only a standby for when my "real bike" wasn't ready to roll. You know, "dull-but-stone-reliable", as in machinery that could be taken for granted (as close as one can get, anyway). There never has been a definitive word on service life. The lowest estimate was 40000 miles the highest in excess of 60000...or 120000 (but smoking and running like ) Those sky-high numbers were from a source in Thailand, where the bikes were/are used as everything from grocery-getters to taxis to fleet vehicles...and he turned out to be shady.You sure have gotten alot of mileage out of that Nice engine. Wish I could get my hands on one. How far do you think it will go?
Yes, I have noticed that yours has plenty of go and seems to have the ability to eat up the miles. I would bet that your oil cooler has contributed alot to the great mileage you've gotten. The reason I say this is because of my own experience years ago when servicing a strangely optioned 90-91 Chevy S10 with a 4.3/R4700 tranny. At 105K miles, I went to go over the little truck and change all its fluids/tune up. Noticing bolt holes in the middle of the bed, I soon realized that those holes were for a gooseneck trailer hookup. I thought, " What kind of moron would hook a gooseneck trailer to a small carriage like this????? I bet the tranny is toast!!!". Come to find out there was a BIG tranny cooler up front. When I went to change its filter, the tranny fluid still smelt like it was BRAND NEW.lol. Even stranger is, I ended up marrying the pickup owner later.lol. She had gotten the truck from her grandfather, who bought it used. I put 40K on it and the only trouble with it was a failed alternator bearing when I changed the original serpentine belt.IDK...never looked that closely
I dunno, CJ...when I began this adventure, I ordered the 137 tune and that choice was based on some educated assumptions. The goal was 55-60mph, riding two-up, ascending a 10% grade, (which translates to 75-80mph on the flat, sans passenger) while retaining as much of the stock durability/longevity as possible. At the time, the 62mm crank was in the prototype stage, otherwise I'd have gone for 160(ish) configuration. I went at this like an OEM engineer. The stock lump in this bike was more of an afterthought, as the bike was intended to be nothing more than a "beater"...the one that got taken to swap meets, thrown-in amongst camping gear, otherwise only a standby for when my "real bike" wasn't ready to roll. You know, "dull-but-stone-reliable", as in machinery that could be taken for granted (as close as one can get, anyway). There never has been a definitive word on service life. The lowest estimate was 40000 miles the highest in excess of 60000...or 120000 (but smoking and running like ) Those sky-high numbers were from a source in Thailand, where the bikes were/are used as everything from grocery-getters to taxis to fleet vehicles...and he turned out to be shady.
I've seen a few of the smaller tunes (up to 127) make this kind of mileage. The one that failed did so because the owner ran it without oil! There were a couple of 160 tunes that were still healthy around the 11000-mile mark. I lost track of them all, over the years. As for my stocker, beyond the crankshaft oil seal (began seeping at the 17K mark) it's shown no signs of fatigue. Valve lash has been untouched since day one and I do check it. The original spark plug is still present. I always park the bike with the engine on the compression stroke; rotating the kickstart lever by hand, it still feels like the onset of hydrolock when then valves close. My guess is that the bore will eventually be the wear point. That said, I've yet to see a stocker with a worn-out bore and you wouldn't believe some of the junk that came out of Thailand sold as "used & reconditioned"...every last one of them had the stock bore & std size piston. So, the most factual answer is "who knows?". I wouldn't be surprised if mine is still healthy at the 40000-mile mark. At the annualized mileage rates I've ridden since 2002, that'll be reached somewhere between 2027 and 2032. Stay tuned...
I concur, oil can never be a.) too clean or b.) kept at a temp that's "too ideal". I chose the oil cooler and and oil viscosity based on real-world testing. When I first installed this motor two things became readily apparent. One was the shift quality...that took about 100 feet. The other took a little longer...peak oil temps. Around here, it's mostly race up to 50mph+/-, then grab a handful of brakes every 1-3 miles. That spikes oil temps very effectively. I'd get about 20-30 minutes of "stoplight grand prix" action before oil temps were pushing 235F (113C). That's certainly not fatal. GN4 oil is probably good to ~270F before thermal breakdown becomes an issue...most quality oils are. That said, I wasn't pushing the motor anywhere near as hard as I knew would be required...and...I want the temps held below 110C, peak, with 90-105C being what I consider ideal. Ever notice how shift quality loses that velvety quality once oil temp tops 100C? That's telling you something, if one is willing to "listen".Yes, I have noticed that yours has plenty of go and seems to have the ability to eat up the miles. I would bet that your oil cooler has contributed alot to the great mileage you've gotten. The reason I say this is because of my own experience years ago when servicing a strangely optioned 90-91 Chevy S10 with a 4.3/R4700 tranny. At 105K miles, I went to go over the little truck and change all its fluids/tune up. Noticing bolt holes in the middle of the bed, I soon realized that those holes were for a gooseneck trailer hookup. I thought, " What kind of moron would hook a gooseneck trailer to a small carriage like this????? I bet the tranny is toast!!!". Come to find out there was a BIG tranny cooler up front. When I went to change its filter, the tranny fluid still smelt like it was BRAND NEW.lol. Even stranger is, I ended up marrying the pickup owner later.lol. She had gotten the truck from her grandfather, who bought it used. I put 40K on it and the only trouble with it was a failed alternator bearing when I changed the original serpentine belt.
I didn't do anything to my CT today, but I did reset my password and login to this forum for the first time in a couple years. It seems every time I get started on the project I change jobs and can't make time for it. So this time I waited until I already changed jobs (3 months ago) before pulling the bike out from under the garage stairs. Only time will tell if this strategy works, but it's great to be on here again and see the same familiar usernames. My CT hasn't run since I found it at the landfill 6 years ago, but I am hopeful that I can get it reassembled and started in the next 6 months. Lets not talk about the odds...
Awesome dealI'm on vacation 1100 miles from home. Found a 70 KO engine on CL in Wyoming for 100 bills so I stopped on my way through to take a look as it was only 2 miles out of my way. Couldn't pass it up, the guy had swapped it out for a 125cc years ago and let me have the engine complete with intake manifold and carb, coil, harness, battery, 6v bulbs, rear 44t sprocket, kick and shifter arms, and airbox. Everything is in real decent shape. The guy thought it was from a 69 but the S/N is 126312 so it's actually from a 1970.
Buy itI looked at my new seat cover and thought about installing it. Then decide just to take it for a spin and install another day. Also looked at a 74 ct90 with only 272 miles in mint condition owner wants $1250 for it looks like it rolled of the showroom floor. What should I do ?
Good thing you're back in Utah, Ryan. Since you left it's been warming up. It's 82 right now.
How's your drinking water, Kirby?