What is the safe running distance of these engines?

[Waxxumus]

I have about a 15 mile commute to work. 30 miles round trip.
In this situation, would it be necessary to stop the engine for periods to rest, then restart and run again after about say 20 minutes?
Or are these engines fully capable of going 15 miles after break in without a problem?

 

[crassius]

I find it takes 6 to 8 miles to get those huge crank cheeks up to a stable operating temp. My run-in trips are usually about 16 miles to get a new engine working well before delivery to customer.

You should have no problems with 15 miles.

 

[Waxxumus]

Then on a ride we shall go.

 

[troyg]

I don't know what engines you're talking about, but the quality rackmounts will run 8hrs straight easy, plenty of 200 mile-in-a-day trips here.

 

[Timbone]

For a HT 2 stroke, you should be getting a minimum of 90 mpg. Full 2.5L tanks should take you a minimum of 50 miles. My 25 mile round trip commute only requires about a quart of fuel.

 

[butre]

they're air cooled, run them as long as you like. as long as you're moving they'll never overheat

 

[Waxxumus]

Well, I ended up running it for awhile yesterday. Went about an hour and a half on it.
Turns out I had a tiny leak in my fuel line that was causing leaking fuel and an air leak. Fixed that, now she runs with a bit more pep. Back wheel appears to be beginning to bow inwards. Aah cheap spokes almost time to get that cnc milled sprocket and new rims. Wonder how many miles after 400 i can ride on this funky rim.

 

[crassius]

depends on whether you own a spoke wrench

 

[Waxxumus]

i shall buy one.

 

[The_Aleman]

they're air cooled, run them as long as you like. as long as you're moving they'll never overheat

Overheating is one thing, catastrophic failure is another. Chinagirls aren't really designed for all-day operation under heavy load.
They are primitive low-compression engines with always-questionable build quality that seem to be happiest below 6K RPM.

As soon as yet another motorcyclist-in-denial starts hopping them up, raising the compression and other mods, the chances for engine failure greatly increase.

Early "instructions" that came with chinagirl kits used to state "do not run for more than 30 minutes at a time".
(That may have been a blessing in disguise because many of those older kits would rattle your teeth out within 30 minutes!)

If one is looking for a reliable engine that can run all day long under load, the first place to look is at industrial/commercial engines.
Engines made by companies like Tanaka, Robin-Subaru, Honda and clones like Lifan and Huasheng - these engines will typically run as long as you want them to.