'86 Aero, Power on, Power off?

Fishman43 · Post by **Fishman43** » Mon May 21, 2012 7:04 pm

To start, I have been riding the scoot with no issues for a while, but suspected a slightly lean condition based on the ring ding ding of the scooter. I moved my carb needle clip down one click (moved the needle up one) and went for a ride. About 2 miles into the ride the scooter started surging, power on, power off, power on, power off... you get the idea. It did stall once, but started right back up. I made it back home and now need some help.

Intuitively I think that I should move the clip back since that was the last thing I did before the problem started. But my gut is telling me this isn't a slightly rich fuel problem. Electrical perhaps? CDI going bad... perhaps? Any help out there in the two smokin masters? Anyone run into this problem before?

Thanks!

Aeromatics · Post by **Aeromatics** » Mon May 21, 2012 7:12 pm

had the same problem. Ur runnin lean. Turn ur air mix screw all the way in to the right, then check you manual for base setting, mine was 1 1/4 turn to the left. Choking problem solved. Get a tach and fine tune ur machine. Im runnin an 85 aero 50, its never been faster, hits 40 no problem.

Fishman43 · Post by **Fishman43** » Mon May 21, 2012 7:15 pm

This problem started when I richened the mixture by raising the needle

dun rite · Post by **dun rite** » Mon May 21, 2012 7:46 pm

by raising the needle, lowering the clip you have made it leaner. try the reverse

Fishman43 · Post by **Fishman43** » Mon May 21, 2012 9:01 pm

dun rite wrote:by raising the needle, lowering the clip you have made it leaner. try the reverse

Wait, WHAT! Did I fail carb 101

All this time I have thought raising the needle allowed more fuel out of the jet???

mousewheels · Post by **mousewheels** » Mon May 21, 2012 10:15 pm

Lowering the clip should be richer in the area of needle influence (see diagram)

With the needle lifted - maybe your engine is 'four-stroking'? I've had scooters alternate between normal and four-stroking. Weee..neee..Weeee..neee all the way home

. http://en.wikipedia.org/wiki/Four-stroking

: NeedlePosition.JPG (22.79 KiB) Viewed 6790 times

dun rite · Post by **dun rite** » Mon May 21, 2012 11:04 pm

Fishman43 wrote:
dun rite wrote:by raising the needle, lowering the clip you have made it leaner. try the reverse
Wait, WHAT! Did I fail carb 101 All this time I have thought raising the needle allowed more fuel out of the jet???

oh S had it wrong guess i failed carbs 101 I should read better

Fishman43 · Post by **Fishman43** » Tue May 22, 2012 7:28 am

mousewheels wrote:Lowering the clip should be richer in the area of needle influence (see diagram)

With the needle lifted - maybe your engine is 'four-stroking'? I've had scooters alternate between normal and four-stroking. Weee..neee..Weeee..neee all the way home . http://en.wikipedia.org/wiki/Four-stroking

Thanks Mouse, I will return the needle to the previous clipped position and see if the issue resolves.

Bear45-70 · Post by **Bear45-70** » Tue May 22, 2012 1:28 pm

Too rich can cause surging too.

Fishman43 · Post by **Fishman43** » Thu May 31, 2012 8:34 pm

After adjusting the clip back to the starting point I thought the issue was solved since I didn't have the problem on the next ride. Today it briefly happened again and the scooter felt a little sluggish unlike it has in the past (at the same settings it is at now). When the power cuts out it is almost like a switch turns off the engine and then back on a second later. Any ideas to solve this issue.

mousewheels · Post by **mousewheels** » Thu May 31, 2012 11:15 pm

-- on the electrical side --
If the power seems totally shut off - Swap coil and CDI if you have them handy. An intermittent short to ground on the 'kill wire' might cause issues too.

Fishman43 · Post by **Fishman43** » Fri Jun 01, 2012 11:51 am

I think I have a spare CDI floating around in a parts box somewhere, I will try that.

Intermittent electrical problems are probably the worst problem I can think of to track down

Fishman43 · Post by **Fishman43** » Wed Aug 01, 2012 7:15 pm

Bringing this back up for a current status. Mouse and Bear had it correct, I was running to rich and four stroking. I finally got around to getting a temp gauge and put it on under the spark plug. I ran it wide open as best I could with the current settings, managed to slug up to 35 MPH with WOT but the temps never got higher than 224.

I put in one jet size down and the power and pick up took right off. Ran it as hard and as long as I could at WOT and the temp spiked at 312. With no more surging or power pulsing.

This brings up a up question and an observation:

1. What is a safe peak temp for the Aero "large" bore from Daywot?

2. The previous jetting size was what I ran it at all last summer with no issues. This spring I replaced the rubber O-rings between the carb and the intake. I must have been sucking a modest amount of air all last summer to make the previous jet size run so well, yikes!

Bear45-70 · Post by **Bear45-70** » Wed Aug 01, 2012 7:30 pm

You are aware the the needle will NOT effect the WOT mixture? You need to change the jet to do that.

Bear45-70 · Post by **Bear45-70** » Wed Aug 01, 2012 7:44 pm

About 375┬░ is the max you want to see after a WOT run and closing the throttle (lean condition).

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'86 Aero, Power on, Power off?

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