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Post by tomcatsdb on Nov 25, 2013 15:25:54 GMT -5
After a bit more riding in (yesterday was friggin cold!), I'm thinking of dropping the jet size back. Even after a good warm up period, the thing refused to respond well to the throttle and seemed to bog down (didn't really want to idle for that matter), so I think it's running too rich at the moment. One question I do have is if the temps outside will change how the machine responds to larger jets... I may finish out the unseal and drop the original carb back in place just to test things over the holiday. I also need to open the CVT and check everything is fine there as the machine approaches the 300 km mark. Happy scooting  |
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Post by 90GTVert on Nov 25, 2013 15:43:25 GMT -5
Temp will affect it as well as humidity. Low temps and low humidity make for more dense air and may need richer carb settings. Air at higher temp and humidity is less dense and may require leaner settings.
Bone stock setups that are a bit more restrictive don't tend to respond so much, but more open setups like unrestricted air boxes and pod filters are more likely to need jet changes.
I use a stock air box, all restrictions and snorkel removed. I had been using a 90 main jet with the needle on the leanest setting all summer. When it started to drop below 40 I had to upjet to a 92 to keep the same air/fuel ratio according to the wideband and as it got even colder with dry air coming through I had to also move my needle a notch richer.
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Post by tomcatsdb on Nov 25, 2013 17:29:52 GMT -5
Hrm... Thanks for the info. I've kept pretty much everything stock save for the fuel lines and replacement carb. I'll have to open it and verify what it's jetted at and see what the needle is set at. I should probably have a look see at the plug too.
Basically w/ the cold yesterday, it was pretty unhappy. Since I changed the carb out, the scoot seemed to bog down briefly when you first apply the throttle, but in warmer temps, it picked back up quickly so I really didn't think too much about it. With the cold yesterday, it didn't want to stay at idle, but it also didn't respond well to too much throttle either, so it was a case of keeping it just right when stopped. It also didn't like WOT when going down the road.
I should probably also go over the vacuum lines too and get those swapped out in case there's a problem there (maybe I mussed a line when I checked the valves again trying to find the cause of the rattle noise). Is there a difference in the vac and fuel lines? The stock hoses all seem the same, regardless if fuel or vac, so I'm not sure if I should use the same hose type I did for the fuel line swap.
In any case, tomorrow's supposed to be back up to 60 though and it'll be raining. Since this is going to pretty much be a daily driver back and forth to work (save for rain and whatnot), I need to figure out how to deal with the temp changes other than muss with the throttle all the time to keep it running. Going back over the other taotao threads, it seems the plug condition is the best indicator of how rich or lean the engine is w/o resorting to instrumentation, so I'll start there and work my way up. As a side note, I have one other small question regarding seafoam. With the scoot having such a small tank, how much should I use per tank and how often should it be used? A quick forum search showed plenty of people use it, but not sure how much to use per tank.
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Post by 90GTVert on Nov 25, 2013 19:39:26 GMT -5
There is a difference in vacuum and fuel hose. Never use vacuum hose for fuel hose, as it's not mean to stand up to constant exposure to fuel. A lot of times you can get away with using fuel hose as vacuum hose, but not all hoses are created equal. Some hoses will collapse under vacuum, others won't.
I have a wideband on mine so I've been able to clearly see what my air/fuel ratios are doing in different circumstances. Mine was just a little on the rich side in mild weather and in cold weather it would creep up into 14:1 (lean) before I upjetted. I'd prefer to have it rich on the warm days than lean on the cold ones. Rich may slow you down a little on those warm days and you'll prob get a sputter when you hit the throttle, but it shouldn't hurt the engine unless you are way rich (which shouldn't happen unless you have some sort of drastic change or you go way too large on the jet/settings).
I'm not a Seafoam user so you may get a better answer from someone else or by directions on the label, but a cap full to the tank is an answer I've seen quite a few times. Some swear by it and want a cap in each tank, others use it somewhat irregularly or monthly, and some only add it when they have a slight issue they hope it solves or when they may not be using the scooter as much as normal.
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Post by tomcatsdb on Dec 3, 2013 20:10:34 GMT -5
Cool. One cap in with the fill up and it's working fine. The engine definitely does need it's warm up time. There's a period where the choke will turn off and the engine idles way down and will shut off unless I manage the throttle. After a bit of time, It'll start responding to the gas properly (before that if you give it anything beyond just a small amount it'll stall out). After that it runs fine. Is this pretty much in line with what other gy6 owners get?
It's also at the 300 km mark, so another oil change is due.
For the cold spells, I have to say, thermal pants and shirt are _very_ helpful.
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Post by 90GTVert on Dec 3, 2013 21:43:12 GMT -5
That cold start procedure is normal for these.
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Post by tomcatsdb on Dec 12, 2013 9:35:05 GMT -5
Ok, so it's around 36 F here. I tried getting the machine to run. Warmed it a bit this morning and changed the oil out. After the oil change it'd rev ok when on it's stand. When on the road though I couldn't get the machine to get up to speed. Idle was fine, but it just wouldn't rev. If I repeatedly goosed it, I could eventually maybe get up to 20 mph, but it'd sputter and die out if I kept steady throttle. Any ideas here?
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Post by 90GTVert on Dec 12, 2013 9:38:30 GMT -5
Sounds like it's lean. With mine if I WOT-release-WOT-and so on, it will load up from too much fuel from the accelerator pump. Seems as if yours is relying on the accelerator pump to keep it running. Verify that you have no intake/vacuum leaks, look at the plug, and see what main jet is in there.
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Post by tomcatsdb on Dec 29, 2013 12:20:14 GMT -5
Replaced vacuum hoses w/ some Prestone lines from the auto parts store. Same problem. Tried to see if it was the carb so changed that out (back to stock) and problem stayed for a bit. Checked all the other lines (save for shifting a few of them didn't really do anything else) and the problem went away. Now it runs fine.
When I changed the carb, I saw the fuel hose might have been angled badly between the filter and the tank, so I used some of the old vac hose and made a spacer to force a downhill slant (zip tied in place between the fuel line and the plastic shield). Maybe problem was an air bubble caught in the line or something? In any case, with the spacer, if that was the cause of the issue, it shouldn't do it again.
Hope everyone's having a good time over the holidays.
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Post by tomcatsdb on Jan 25, 2014 17:17:28 GMT -5
Fun times ahead....
So riding home from work on the 16th. Scooter sputters out (was running great), so I pulled it over. Smelled gas and started seeing it drip out down from above the engine. Opened the seat and the carb cover. Gas was pouring out from the overflow tube. Plug that, then it starts dripping out the air cleaner. Finally got the idea to pull the vac line from the gas shutoff. Gwarg.
Anyway, it dropped about a half gallon of gas. This was with the stock carb. I've been waiting for warmer weather before checking to see what the problem is. I have my replacement carb that I ordered earlier, so I'm going to clean that one out and see if one of the jets was clogged or something and re-install it after fixing it.
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Post by 90GTVert on Jan 25, 2014 19:25:42 GMT -5
Sounds like the float is stuck. Tapping the bowl will sometimes free it up in a pinch, but it's best to take it apart, check everything over, and clean it.
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Post by tomcatsdb on Jan 25, 2014 19:49:17 GMT -5
Yeah, that was my thought, either stuck or something came apart inside. The stock one is still mostly sealed, so that's why I'm pulling the second one out and using it. Anyway, I'll pull the stock carb apart when I get some free time. It might be a while though since I have to get the machine working first.
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