|
|
Post by supermel74 on Oct 13, 2010 19:46:17 GMT -5
The other day while driving up a long hill on a nearly empty tank of gas, the scoot sputtered a bit, nearly stalled, but pulled out of it and kept moving along. About 5 minutes later I smelled something like burning plastic for about 5 seconds but didn't see any smoke or damage so I kept on going. I've rode several times since, fairly long rides(50 + miles) and haven't had anymore problems. I checked the plug today and noticed the insulator was melted. I didn't see any further damage to the engine or anything but I didn't really give it a good look either. I changed the plug and richened the mixture about a 1/4 turn. The idle is smoother and it seems to be running fine. Here's a pic of the plug. It's a bit blurry but you can probably see where it melted... Any opinions or suggestions?  |
|
|
|
Post by 90GTVert on Oct 13, 2010 20:54:40 GMT -5
I would think perhaps a spark plug a heat range colder and/or possibly needing a larger main jet. It coulda just been starving for fuel from the near empty tank, but I'd at least see what the plug looks like when you install a new one.
|
|
|
|
Post by supermel74 on Oct 13, 2010 21:27:40 GMT -5
You wouldn't happen to know which plug would be a heat range cooler than a BPR7HS/BPR7HIX would you? The plug that melted was the iridium(IX). I put the regular BPR7HS back in because I had one as a spare.
|
|
jimh
Scoot Enthusiast
Posts: 198
|
Post by jimh on Oct 13, 2010 21:44:49 GMT -5
An 8 would be cooler
|
|
|
|
Post by 90GTVert on Oct 13, 2010 21:54:44 GMT -5
Yeah, the 8 series NGKs are as hot as I run in my minarellis.
|
|
|
|
Post by supermel74 on Oct 13, 2010 21:55:11 GMT -5
Awesome. Much thanks guys.
|
|
|
|
Post by stepthrutuner on Oct 14, 2010 13:38:27 GMT -5
I wish the picture were clearer. I really didn't know you could melt a porcelain insulator. The cement will boil out between the insulator and center electrode with excessive heat. I would think the ground strap would go before the porcelain would.
|
|
|
|
Post by tomcas on Oct 14, 2010 21:14:03 GMT -5
It's hard to tell from such a crappy picture but I don't see the characteristic white coloring that would indicate too lean a mixture. If a lean mixture was the cause then turning the screw isn't going to do squat. That would require rejetting, which brings me to the question....it must have been OK in the past so something else must have changed, like a vacuum leak or partially plugged main jet. Help us help you... post a decent picture.
|
|
|
|
Post by 90GTVert on Oct 14, 2010 21:32:35 GMT -5
He said he ran it afterwards and it was fine. For that reason, I don't think plug coloring is necessarily relevant. It may be, but climbing a hill can get the engine pretty warm and then he said it was running out of gas. Once he got gas it ran fine I suppose, so it would color the melted plug. I dunno, just my thoughts.
|
|
|
|
Post by 2strokd on Oct 15, 2010 8:37:05 GMT -5
Ide try a BR8HS and see what it looks like after a few miles?
The 7 might be good for winter or colder weather? Ive seen allot of minas with em
stock....
|
|
|
|
Post by lshigham on Oct 15, 2010 14:11:23 GMT -5
Ide try a BR8HS and see what it looks like after a few miles? The 7 might be good for winter or colder weather? Ive seen allot of minas with em stock.... I have a 9 series in mine, as recommended by the manufacturer. |
|
|
|
Post by supermel74 on Oct 16, 2010 16:02:30 GMT -5
Here's a slightly better pic. Still blurry but my cell phone camera won't do any better on close up shots. Got a BPR8HS plug today. I'll put it in tomorrow and see what happens  |
|
|
|
Post by 2strokd on Oct 17, 2010 4:38:14 GMT -5
Givin it dosnt have an air leak and everything else is good, it should be fine and run well with a cooler plug i think :riding:
|
|
