My MC-13-250 has problems

[ykdavid]

I got the air out of it by running it and refilling it a few times. <-- Is that burping it?

[spandi]

Originally Posted by ykdavid

I got the air out of it by running it and refilling it a few times. <-- Is that burping it?

Yeah. Just as long as there is no air in the system. (give the radiator hoses a squeeze to make sure) Now what about the temp sensor? (the fan shouldn't be running continuously) and in your picture it's unplugged.

[Guest_3]

If the fan is running all the time. You shouldn't be overheating above 45mph.

I would do a radiator pressure/leak test.



And a cylinder leak down test also.



You can rent these from most auto parts store.

[jrryan]

Why would you do a pressure test on a radiator that he didn't say was leaking?

He said he changed the oil and didn't mention any antifreeze in it so it doesn't have a blown head gasket. Not a stuck thermostat either, if it was the scooter would overheat just idling?

It's very simple, air in the system, the slightest amount will make it overheat especially after it's ran at higher RPM's.

We have a full proof burping how to where you first asked about this scooter and I know it well and before anyone asks, yes I have a scooter with this same exact engine/radiator set up along with two other water cooled scooters including the 250A and 250B with linhais.

JR

[spandi]

As usual JR your tech chops are dead on. (burp the baby) but I'm also thinking that the jury rigged wiring, no temperature sensor, and having the fan on all the time can't be good.

[jrryan]

Yes he needs to fix the thermo switch and re-wire the fan but at this point it's not an issue with the over heating. But in the long run it will cause weak battery issues because unlike the other popular 250 engine the linhai this engine's charging system is weaker.

Also it seems that when I ask some questions they seem to get edited? In the above post I asked why would one do a radiator pressure test on a radiator that is not leaking? Makes no sense? Everyone knows if the radiator is leaking eventually the engine will run hot but even then you just fix or replace the radiator, pressure test?

Also if the engine has low compression? This will not cause overheating.

I put the question back in.

JR

[Guest_3]

Also it seems that when I ask some questions they seem to get edited?

By who ??. Only a mod or you can edit your posts.

It will say who did the edit in your post.

It wasn't me.

I guess we do things different out here at chasing problems.

Without being there, Nobody really knows whats wrong with it.

[jrryan]

Originally Posted by scooterwayne

By who ??. Only a mod or you can edit your posts.

It will say who did the edit in your post.

It wasn't me.

I guess we do things different out here at chasing problems.

Without being there, Nobody really knows whats wrong with it.

It wasn't me.


Didn't say it was?

I guess we do things different out here at chasing problems.


Very different indeed? Man never said or implied it was leaking, pressure tests are for a leaking radiator, compression tests are for engine problems, has nothing to do with it running hot.


Without being there, Nobody really knows what's wrong with i

Don't need to be there unless his information is wrong. By his information he does not have a blown head gasket or a leaking radiator. Air even the slightest amount is a killer on this engine. Thermostat isn't closed or it would heat up in less than 5 minutes.

He hasn't mentioned if he has checked to see if the coolant is circulating. If it is then it's just plain old air......but if he doesn't have coolant circulation, I'll see if the way people check out there know what the problem is?

JR

[Guest_3]

when i pulled away "I noticed a lot of smoke coming form the muffler" I thought to myself that "if it continued I'd stop" but shortly after it stopped. So I rode on.

That is the sign of a blown head gasket = Steam looking like smoke.

Next I started losing power "It didn't shut off like before" but it was slowly dying.

It was getting HOT again.


And you still think its just air in the cooling system ? .

[jrryan]

Originally Posted by scooterwayne

That is the sign of a blown head gasket = Steam looking like smoke.

It was getting HOT again.


And you still think its just air in the cooling system ? .

Missed by all including me:

So I thought to check the coolant the reservoir was full but when I looked under the seat I found a hole in the plastic filler.

Loss of power = hot engine.

Steam equal coolant coming or dripping out this hole. If the radiator reservoir has a hole in it not only is it losing coolant slowly when the engine heats up but when it cools and the radiator is pulling fluid back in the radiator there is none there and it's pulling air into the system.

We all know that these systems work just like a auto system, cap expands when hot, pulls extra coolant if needed from the reservoir tank or releases it back to the tank if not needed. As it cools off it makes sure the radiator is topped off to the full amount.

Got to fix this or it's never work right.

JR

[ykdavid]

did the burp thing and now waiting for a nicer day to test it.

[Guest_3]

David, Any updates ??.

[damorg5623]

I am having a similar problem with overheating. I thought that I had burped all of the air out, engine temp. was running normal. The fan was coming on. Twice I let my scooter idle for about 30 minutes and everything was fine. Or so I thought it was until I went out on the interstate. I went only about a mile at around 70 mph. then I exited. The temp guage never went above normal. The fan was running, everything appeared fine. After about another mile on the street, I noticed the temp. guage had red lined HOT. I have NO thermostat installed, I had removed it to eliminate that as a possible problem. So there shouldn;t be anything keeping the collant from circulating. Now, when I pulled over, I noticed that my fan was NO longer coming on. I believe that there is still air in the system, and my interstate ride moved it along.
Because before when I first flushed the system, and then installed the new coolant, when I first started up the scooter, the fan didn't come on because the radiator was cold. Even though the engine was HOT, but the coolant wasn't getting circulated thru the system because of the AIR in the line. As far as the radiator was concered the collant was cool and didn't need the fan. The HOT coolant wasn't being circulated to the radiator. However, after several burps, the fan came on and the temp guage went to normal. The problem that I am having now, is exactly as it was yesterday before I was able to get the darn thing to burp, burp, burp.
So, be sure to burp your baby really really good!

[damorg5623]

I too am having serious overheating issues with my MC-54-250 Roketa. This has been going on for 8 months now. I have already posted several threads about it. It has been a long story but I will not start at the beginning. I will just start here...
I can go about 4-5 miles and then it starts to overheat. SOMEHOW... Air keeps getting back into the system. I have burped, & burped, & burped, & burped, & burped this scooter and STILL there is air in the cooloing system. After every good burping session, I can actually go around 25 miles before it starts to overheat. I received a New Fan, Thermostat, and Both Temp Sensors from Roketa. I only had to pay shipping charges. Still did not fix this problem though. I DO NOT have any oil in my anti-freeze, nor do I have any anti-freeze in my oil. I was told that this was a sure sign of a blown/bad head gasket. I was told to try and spray ether (starting fluid) around the cylinder head to see if the idle increased. It DID NOT. I was a little bit afraid to spray too much, for fear of an explosion caused by heat around the exhaust.
I honestly DO NOT know where, or how air keeps getting back in to this cooling system. Unless it is being sucked in thru the head gasket.
I am at a loss here. Like I said, this has been going on for 8 months now. I have gone thru 2 gallons of coolant trying to keep burping the air out. There is NO way that all of this air is still coming from my coolant change.
By the way... I am an expert now at doing JR's burping method.
Also... after I have gotten ALL of the air out of the system, and filled both the overflow tank and the radiator with the proper coolant levels, while I am riding the coolant is being burped back into the overflow from the radiator. This causes the coolant level in the radiator to get too low and that's when the overheating starts.
I will stop my ride and return home before it gets too hot.
Two, even as much as 3 days later, when I start to go for another ride, of course I check the coolant level in the radiator first, and there is STILL a great deal of pressure inside of the radiator/cooling system.
Still, 3 days later, and the pressure is so great that it spews out some of the COLD coolant. I then go thru the burping process all over again. This is killing me and my wallet. I want to take a nice long ride soooo bad, and I can't.
I can just make it to the necessary places like Walmart, the doctors office, gas station etc... As long as I don't go more then 7-8 miles from home, and that's being generous, I'm fine. But what's fun about that.
Please, somebody HELP!
I did read that there was a kit that I could purchase from the automotive store for about $45.00 that would tell me whether or not there were any exhaust gases in the radiator. I was also told that I could use a sniffer from an emissions testing/repair place to sniff out any exhaust gases in the radiator. This would supposedly tell me for sure whether or not I had a head gasket leak. I'm guessing one of those should be my next move, huh?
If anybody has any other thoughts, PLEASE, PLEASE, PLEASE call me...
Dan @ 443-653-1674

[bandito2]

GOOD GRIEF! Some of you guys are tough as hell because I wouldn't put up with
these relentless headache inducing POS problem (often times clone) scoots. If it
were me, (but it aint, so it is JMO) I'd cut my losses and unload the bike. You're
loosing on it in more ways than one anyway as it is it so it wouldn't matter much
to take a loss when you do sell it. Of course you'd need to make a disclosure on
the overheating or whatever issue.

I don't mean to make you feel bad but I can't be doing any worse for you than what
your bike is doing to you already. (and for as long as you continue to let it be a
problem to you.)

My advice, because this thing is taking the joy out of your scootering experience is:
Be done with it and get a more reliable bike. (not a clone)
FWIW