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Post by daven68 on May 6, 2012 19:03:00 GMT -6
Hey guys, thanks for all the great info. Thankfully , as scootforfun stated we got the problem solved. As we disassembled the side panels again to start on the tests we noticed a disconnected plug a few inches away from the RR,which we originally thought was an accessory plug (there seems to be a few of them hanging around) plugged it back together and bingo! She`s charging like a champ. ;DNeither of us remember touching it but it`s possible we did or it happened the last time in the shop. Strange thing now is the engine not cutting off when the key is removed Lights and fan cut off but not the engine. Oh well I guess it`s not a huge deal since it cuts off by the kill switch and will not start again untill the key is back in the ignition position so at least that way it cant be driven away without the key. now back to the overheating problem.
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Post by daven68 on May 6, 2012 18:10:23 GMT -6
Here I go again, hottest scooter on 2 wheels. Over heating has improved but still running too hot. Here`s what we did so far, removed the thermostat ( i know some of you had recommended against it, but by the time I got that post the bike was almost back together so thought I would just try it to see, I`m trying to juggle this repair around work. I do have a new thermostat in the waiting) . Flushed the radiator by forcing water through the radiator cap neck and disconnecting the hose at the water pump. did not see a clear way to flush the water pump though. refilled with dexcool and burped, saw air bubbles and a drop in levels but no gurgling . repeated this and topped off. took on a decent ride and temp stayed around 1/2 way or a little below. took a hard ride up a steep mountain about 2 miles straight up. heated up to over 3/4 , but did not redline. cooled to 1/2 on the way back down. stayed between 1/2 and 3/4 for the ride back. coolant level had dropped about 1 cups worth when i got back , topped off again. My friend , scootforfun, who is working on this with me has a theory. One thing I forgot to mention is that , last year, when the radiator fan originally crapped out the mechanic I was using had the bike for a month and then said he could not find a fan for it . Since I did not know better at that time I believed him and allowed him to cut out the front grill and install this huge aftermarket car fan in it`s place wired to a toggle switch. It sounds very similar to an air raid siren when engaged, and it worked to a degree, but never cooled properly and the bike always ran about 3/4 temp even at idle. now the new fan is installed but scootforfun thinks the big fan in front is possibly blocking the airflow from reaching the radiator at high speeds. I could remove it , leaving a big gaping hole where the grill used to be , if this would help. What do you guys think?? Also, when the scooter was in the shop when this all began one of the things he was supposed to do was a compression test to check for a head gasket leak. He said he did and it was fine, but I have no way to verify this.
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Post by daven68 on May 6, 2012 8:06:19 GMT -6
Thanks for all the suggestions guys, I`ll try them and let you know how it turns out. Hope it`s the RR thats a quick , easy fix on this bike. I don`t have a clue on how to change out the stator.
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Post by daven68 on May 5, 2012 17:18:40 GMT -6
Hi again guys, think I have the over heating issue solved( thanks for all the help), but now realized a new problem (does this ever end?). Scooter is again a Jonway yy250t-2 and it is apparently not charging. Ruled out the battery being bad and from research it seems to be down to the stator and/or the regulator rectifier. Battery shows about 12.4 volts with no lights or fans on . when the cooling fan comes on it drops to about 11.6 , lights drop it even more. Looks like I have been riding around on pure batt power for a little while now. Also while the engine is running if I disconnect the battery it immediately kills the engine. Any thoughts on how to test which one of these parts has gone belly up? Thanks again.
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Post by daven68 on Apr 23, 2012 21:14:36 GMT -6
Thanks again to everyone who replied, we will definitely be using your suggestions. I will go ahead and order a new stat and install it hopefully that plus a good system flush will solve the issue. Cant wait to get cruising again. Forgot to mention we live in the mountains so everywhere I go is uphill. If that doesn`t solve it i`m not real sure where to look next.
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Post by daven68 on Apr 23, 2012 10:55:43 GMT -6
Hey guys, thanks for the quick response. I have been reading through the threads you suggested and all others i can find as well. I believe it was on another forum where i read of someone with the same engine and problem removing the thermostat and fixing the issue , which was where I got the idea. Out of curiosity why do you say it must be installed? I know on a car it mainly gets the temp up quickly for heating purposes. Also can you recommend a good place to order a replacement thermostat from? I believe the engine must be the CFmoto clone because a friend of mine , with greater knowledge of these things than I have, is working on this with me and he has the Linhai scoot and it is totally different than what I have. As a test I boiled the thermostat and it opened up but the spring had a gap in it, I would say it opened 3/4 of the way maybe a little more .Is that normal or should it have completely compressed tight? We did not find the housing to be clogged up but dont know about the rest of the system yet as we have not completed a flush. Also the bike has about 4000 miles on it . It did sit all winter with periodic idle running where it did get too hot ,but at that point the fan was not operating. since then I have put about 100 miles on it riding it back and forth to the shop on cool days but after what happened I have given up on this mechanic and cant find another local one. Thanks again for all your help.
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Post by daven68 on Apr 22, 2012 19:41:16 GMT -6
Hi, great board. I am looking for some help with some over heating issues. Paid 140$ to my local repair shop and they didn`t fix it. In fact after examination of the bike I believe all that was done was replacing the coolant. Scoot is a 2007 model jonway, yy250t-2 . radiator fan previously died and has been replaced and does now appear to be working. Scooter runs cool, about 1/4 on the gauge for about 20 mins then shoots up to almost red line after that. Left just idling it seems to stay cool, fan comes on as it should. after about 20 minutes of riding at 45 + mph is when it overheats. The bike is now dissembled and I have completely removed the thermostat from the housing. My question is , could running with no thermostat cause any problems? Seems like this bike has always run smoothest when running cold. Any other suggestions would be greatly appreciated. Thanks, Dave
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