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Messages - sf_guy

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Downtown 300 / Re: white smoke coming from 02 sensor area on exhaust pipe
« on: April 29, 2019, 09:36:44 PM »
Sorry I should've said , 'I wonder if I damaged the engine during that test drive when I first took out the cylinder head'. But that sounds like a good diagnostic procedure for a cracked engine, mr. scooterfan.  Anyway, that was the first time the temp went full bars and flashing since I bought it last August (though I've only put maybe just around 60 mi since that time). I wonder if that instance that the idle went up suddenly by itself (to around 3k rpm) at the same time the temp gauge went flashing after my test ride meant that maybe I warped/ damaged/etc. the engine. It must've been like 2-3 secs. that the rpm went slightly up before I realized that  the temp gauge was full/ flashing.

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Downtown 300 / Re: white smoke coming from 02 sensor area on exhaust pipe
« on: April 28, 2019, 09:09:07 PM »
Thanks guys for the replies. Here are more details about my situation:

At first, I didn't replace the head gasket after successfully extracting the bolt and returning the cylinder head (newbie diy mechanic here). I also didn't torque to specs the cylinder head nuts. Then I took it out for a test ride. It was running fine and I was monitoring the temp gauge and it was fine. A few feet from our garage door on my return (after about 10 min test run), the rpm suddenly went up a little bit without me twisting the throttle (idle is 1.8, it went to about 2.5-3). Then I took a look at the dashboard and the temp was full and flashing. And some white smoke came from engine area.
   So, after some research, I decided to replace the head gasket and took out the cylinder head again. I checked the flatness of the head before putting it back (though I didnt use a feeler gauge, just a steel ruler). I also torqued the head nuts this time to specs. Then I tested it but this time I didn't go out (just stationary at garage). And now, back to present time. I wonder if I cracked the engine that first time I test rode it.

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Downtown 300 / Re: white smoke coming from 02 sensor area on exhaust pipe
« on: April 28, 2019, 01:47:57 PM »
thanks. I tested the radiator fan by connecting it directly to a battery and it was working. Then I tested it with the cube thing, even though not knowing what it was then, and the fan wasn't turning. I was afraid I broke something.

In my case, my coolant leak I guess was the result of maybe me not doing the head gasket reaplacement correctly or also maybe that I did the coolant replacement wrong (as a friend told me).
I should've joined this forum way earlier  :)

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Downtown 300 / Re: white smoke coming from 02 sensor area on exhaust pipe
« on: April 28, 2019, 06:15:06 AM »
thanks. Do u think those gasket sealers that you pour on the radiator will work for a warped cylinder head?

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Downtown 300 / Re: white smoke coming from 02 sensor area on exhaust pipe
« on: April 28, 2019, 02:17:39 AM »
Btw, it's a 2012 I bought used last August. I was trying to fix a small leak on valve cover gasket but upon returning the cover, I overtorqued one of the bolts and it broke into two and got stuck on the cylinder head. I had to get the cylinder head out to extract the bolt so that's why I changed the head gasket. Also, what is the cube thing about 3in x 3in x 3in that's connected to the radiator fan? Help will be appreciated

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Downtown 300 / Re: Mirror screw
« on: April 28, 2019, 02:02:39 AM »
I just use regular spanner wrench

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Downtown 300 / white smoke coming from 02 sensor area on exhaust pipe
« on: April 28, 2019, 02:00:59 AM »
hi. I just changed the head gasket on my downtown 300. Engine starts fine but after reaching working temperature, wisp of white smoke start coming out of 02 sensor area in exhaust pipe (if you take off the seat bucket). First in small amounts then getting greater. Also noticed that the radiator fan does not turn on. My bike has 18k mi. Also, my valve cover gasket has a small oil leak. Can this be the culprit?

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