Topic: Can a little spring cause this much damage

[M 750K6]

Sorry if it appears like "damned if I do, damned if i don't", I would not run these air cooled motors standing still for 30 minutes. I would be very concerned about overheating.

Personally, I would forget about the cosmetic stuff for now, deal with anything that's still preventing you from riding, then ride it and use the engine as designed. If all runs fine, then you can sort the cosmetics as you go from there. Avoid causing fresh damage. 👍

[PeWe]

You need a cooling fan after ca 5 minutes idling.
A std table fan work fine. I use it when synching the carbs

[newday777]

You need a cooling fan after ca 5 minutes idling.
A std table fan work fine. I use it when synching the carbs

Come on Per he is in the Philippines not snow country.....he needs a real fan to make his hair flow
😉

[BenelliSEI]

1/2 hour is too long. When you can’t hold your hand flat on the oil tank (+140F), shut it off.

[kyle750]

Damed if I do and Damed if I don't is right

Running the engine for only a few minutes is bad because it allows for moisture to build up in the engine and exhaust

Running the engine on idle for 30 minutes is bad because it gets too hot (but surely hot enough to expel any built up moisture from combustion)

I did place a large table top fan in front of the engine and ran the fan the whole time I was idling the bike and for about 10 minutes after turning off the engine

[newday777]

Actually only riding it a good 1/2 hour or more will burn out the moisture. Idling won't do it. It need the load of riding to push out the moisture.

[kyle750]

How would you know if the engine is overheating to a dangerous level? When you can’t hold your hand flat on the oil tank (+140F) does not sound like a very safe warning method.

While running the engine I kept walking around the bike and I did not notice any extremely hot air around the engine.  When I ride my water cooled Honda 250 for a long period a fan automatically turns on and I  definitely notice the high heat coming off the engine.

No high heat from the CB750

[calj737]

Sorry if it appears like "damned if I do, damned if i don't", I would not run these air cooled motors standing still for 30 minutes. I would be very concerned about overheating.

+1. Especially in Thailand.

[kyle750]

Thailand is scorching Hot and overheating is a real concern.  Does anyone ride over 500 miles in a day on a 50 year old air cooled motorcycle in the middle of the summer through the American Southwest desert? 

[kyle750]

Last month I had a non-running pile of junk and now I'm worried about running the engine for too long and overheating.  I am still totally shocked that "it runs" at all!

[newday777]

Thailand is scorching Hot and overheating is a real concern.  Does anyone ride over 500 miles in a day on a 50 year old air cooled motorcycle in the middle of the summer through the American Southwest desert?

I did back in the 70s and 80s. I had put on a Lockhart oil cooler when I built the motor with a big bore 811, 3/4 race cam, ported head. Keeping it moving so good air flows over the motor is extremely important.
Honda when they introduced the 750 in 69 road around the desert southwest for 12(?) Days to prove it can handle the heat if moving.

[kyle750]

^ ^ ^ Love It ^ ^ ^

[Stev-o]

Last month I had a non-running pile of junk and now I'm worried about running the engine for too long and overheating.  I am still totally shocked that "it runs" at all!

Dont worry or believe everything you read on the internet......just start it when you want, let it run, and dont listen to these guys!!! 

It's a Honda, you cant kill it.  Of course, you may not want to believe me either?

[BenelliSEI]

Oil temp will run well over 200F when you ride the bike. Your hand can only stand about 140F without pulling away. The oil moves all through the engine, so the tank temperature is a good indication of how hot the engine is. It does get a bit hotter around the barrels and head. This is just a good way to make sure you don’t overheat if you are determined to start it up regularly (I wouldn’t).

[PeWe]

If only idling, not revving... It will stop when pistons swell quicker than the bores expand. 
Probably no damage.

I have used my fan direct after a ride when I need to change jets in the Mikuni carbs quickly. Fan helps to cool down the engine surfaces and do the job.
Change pilot and/or main jets and back on the road again.

You need as Stu wrote a bigger fan or 2 fans. The people I have met in Thailand have several fans at home

[kyle750]

  . . .  and if anyone tells me there is too much accumulated dust on the fan blades and needs to be cleaned for better performance and less drag I am going to scream . . .

[newday777]

  . . .  and if anyone tells me there is too must accumulated dust on the fan blades and needs to be cleaned for better performance and less drag I am going to scream . . .

Nope. Just get a real fan that pushes enough aur

[BenelliSEI]

  . . .  and if anyone tells me there is too much accumulated dust on the fan blades and needs to be cleaned for better performance and less drag I am going to scream . . .

That’s the size I use. Turn the front wheel and get it right in there…..

[kyle750]

Turn the front wheel

I love you guys . . . there is always room for improvement . . . (including my bad spelling and poor grammar)

[calj737]

I love you guys . . . there is always room for improvement . . .

Perfection is the result of an endless pursuit of excellence. Accept no substitutes. 

[kyle750]

I love you guys . . . there is always room for improvement . . .

Perfectoin is the result of an endless pursuit of excellence. Accept no substitutes. 

Laughing my ass off.  You guys are even more smart ass and sarcastic than me

[kyle750]

 . . .  the wall mounted rotating fan in the work area.  Rusted and looks terrible but the motor is strong and runs great -  just like the Honda