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Post by hginhouston on Aug 23, 2008 10:09:01 GMT -5
man i have the burp blues....feel like i should have just left it alone....drained....flushed...ok at first it would not take much antifreeze....i have now put quite a bunch in but thermostat not coming on..... i unscrewed where the temp sensor is till fluid came out....rocked bike...rode bike....jiggled hoses. will not take any more fluid...but no fan. any suggestions? where is the thermostat and what does it look like? what should have been 10 min is now 2.5 hours of frustration
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Post by wxguru on Aug 23, 2008 11:10:33 GMT -5
just keep at it....eventually it will work. It took me over 2 hours.....over the course of 2 days to get it.
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Post by hginhouston on Aug 23, 2008 11:14:47 GMT -5
update.....i took the small hose off the top of the thermostat...started motor...getting lots of steam coming out.....is that the excess air?
also disconnect big hose on tstat housing...started motor....antifreeze was coming through the thermostat but is was more of a trickle.
Just curious...what exactly turns the fan on?
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Post by hginhouston on Aug 23, 2008 11:24:33 GMT -5
ran it for about 10 min...still with top hose off of tstat housing.....was getting a ton of steam....when all air is out of system should antifreeze start shooting out of the top hose?
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Post by wxguru on Aug 23, 2008 11:54:45 GMT -5
The fan turns on after the temp of the antifreeze triggers the thermostat to open.....if the thermostat isn't open, the fan won't come on....and if it isn't open, that means air is trapped at the thermostat....once it is displaced with antifreeze and it is circulating properly, it will pop open and the fan should kick on.
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Post by hginhouston on Aug 23, 2008 11:57:08 GMT -5
by disconnecting the small house on the top of the tstat and letting it bleed shouldnt that take the air out?
I had it running a while and is was hissing steam...i was thinking when the air was all gone anti freeze would shoot out.
i am running out of ideas to bleed
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Post by wxguru on Aug 23, 2008 12:20:04 GMT -5
keep trying to burp it from the cap...I know it is an endless cycle, but rock the scooter over....quite far without dropping it, then take the cap off, and watch for the air bubbles...if you are still getting air bubbles, then it is working, it just takes a long time. I wish I could help you with the other methods, but I didn't have to do them...although I did take the same hose off the t-stat until antifreeze came out....but put it back on before the fan kicked on. I only had success by rocking the bike, and then burping it from the cap.....it eventually worked. I wasted alot of fluid on the ground, but it did work and has worked since that time. I know it is frustrating and a PITA....just keep at it. Watch that temp gauge and shut it down before you get to that H on the gauge. That is critical...don't want a gasket failure in the motor or plain out ruin the motor. You might even lightly tap on the tstat housing with a screw driver or something....it may just need a friendly jolt if it is stuck.
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Post by yarddogbbq on Aug 23, 2008 12:51:50 GMT -5
fill it with engine off till coolant comes out of hose near tstat housing not running.
last resort remove temp sender unit (goes to temp gauge) near tstat housing and fill till coolant comes out of hole, (engine off ) put temp sender back in start engine and finish filling at radiator.
dont leave the hose or sender unit loose when engine running. will not work.
just let coolant get to the hose near tstat then clamp and start engine and finish filling at radiator cap.
if all else fails try lowtox antifreeze by prestone fullstrength, fill at radiator till system full. it doesnt blow up as bad or steam.
yarddog
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Post by goblue62577 on Aug 24, 2008 0:39:59 GMT -5
So as long as the fan turns on, you're good right?
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Post by wxguru on Aug 24, 2008 7:14:37 GMT -5
not necessarily...you need to make sure you top it off completely to be good.
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Post by hginhouston on Aug 25, 2008 10:13:23 GMT -5
Update....finally got it all working.....I took off the thermostat and could see it needed coolant. I filled it and while i had it out checked the thermostat...it worked. Put it back in...it was touch....had to be careful not to strip the screws. started up...fan came on....
put on windshield, mirrors and luggage rack.
I still have strange noise coming from the back tire....I can see the brakes are rubbing because the tire does not spin freely....been reading posts about brake adjustments on the 250B.....it is still not clear whether I can adjust from the front handles? Any thoughts?
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Post by bigbottom on May 24, 2009 18:06:19 GMT -5
where is the thermostat and what does it look like? what should have been 10 min is now 2.5 hours of frustration Has this question ever been answered. I too have spent hours trying to burp the system. I didn't want to, but the factory forgot to install a seal for the water pipe connected to the cylinder. I had a thread about it here: scootdawg.proboards.com/index.cgi?board=200cc&action=display&thread=23334. Anyway, repairing the factory mistake caused all the coolant to come out, so I've had to refill it. But after repairing the leak and filling it back up with coolant, the temp gauge keeps spiking to HOT without the fan ever coming on. If I have the radiator cap off and turn the bike off when it approaches hot, about a half a cup of completely cold coolant comes violantly spewing out the radiator cap. So I can't add more coolant but the system won't burp. I've been at this for hours. Where is the thermostat and what does it look like. I have a MC-250B with a linhai engine, and my carb doesn't look like the CF MOTO carb that was posted earlier in this thread. It doesn't look like coolant even goes to my carb. HELP!
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Post by jimslaton on Jun 28, 2009 19:34:57 GMT -5
Have you (or anybody else) tried to back-fill the coolant system from this hose, the one above the "drain" shown in this picture: I know GM's are terrible for bleeding the cooling system (hence many drill a small hole in the t-stat) so another thing that helps is filling the cooling system from someplace other than the obvious, like under the radiator cap area. Back-fill the system from someplace else with 100% coolant, which pushes the remaining water/air out (coolant is "heavier" than water). Does this picture show where to drain the radiator fluid for changing? If not please "show" me where?!
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Post by madmanjustice on Jun 28, 2009 20:04:49 GMT -5
yes, yes it does.
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