250rtc engine/carb problem

**mattbujor** · 12-23-2011, 11:42 PM

barnone what do you think about this?
I was riding again purposely at the breaking point except this time as soon as I started to get the engine chugging I managed to pull the clutch in and keep it revving at 2000 rpms and pull over on the road and keep it running. Some how miraculously it was able to hold it idles but at a lot lower than what it should have been, 1500-1600, and the engine had been pretty hot and warmed up. Usually the bike was riding with cold 1750 hot 1900 but for some reason when the engine started chugging it then lowered to an idle of 1500. Now the wierd part is I was able to keep it idling for some 30 seconds but as soon as I touched the throttle the engine shut off. Does this point to an electrical problem?

**barnone** · 12-24-2011, 04:18 AM

"Now the wierd part is I was able to keep it idling for some 30 seconds but as soon as I touched the throttle the engine shut off. Does this point to an electrical problem?"
That sounds like a carburetor problem to me.
Have you had the carb apart?

"I was riding again purposely at the breaking point except this time as soon as I started to get the engine chugging"
So you can duplicate the problem by riding at the breaking point? What exactly is the "breaking point"?

**MJH** · 12-24-2011, 06:19 AM

I thought you were told you had bad coil, a bad coil can destroy an engine!

Replace the coil, I would not be riding until you get it, the overheating is do to a bad coil.

Get the new coil and then go from there.

**mattbujor** · 12-24-2011, 03:58 PM

Originally Posted by barnone

"Now the wierd part is I was able to keep it idling for some 30 seconds but as soon as I touched the throttle the engine shut off. Does this point to an electrical problem?"
That sounds like a carburetor problem to me.
Have you had the carb apart?

"I was riding again purposely at the breaking point except this time as soon as I started to get the engine chugging"
So you can duplicate the problem by riding at the breaking point? What exactly is the "breaking point"?

unfortunately not the whole thing,
and yes I can duplicate it whenever I want, 2 ways of doing it.
1. ride for over 2 hours, this is not the best way however
2. this works every time I do it: ride the bike for something like 30 minutes. Park the bike and leave it sitting up to like 1-2 hours. Then start it up and ride until it breaks which is 2-7 minutes, this always gets me to the "breaking point"

**mattbujor** · 12-24-2011, 04:00 PM

Originally Posted by MJH

I thought you were told you had bad coil, a bad coil can destroy an engine!

Replace the coil, I would not be riding until you get it, the overheating is do to a bad coil.

Get the new coil and then go from there.

Yea but I got told from a sketchy scooter shop that only worked on the bike for 30 minutes for only $20. To be honest I dont trust them because I then took it to another mechanic and checked myself and the coil had good readings, between 2 and 4 ohms like scooterdepot told me

**barnone** · 12-24-2011, 04:43 PM

Your symptoms sound like my Honda VT500FT coil problem. The coils were located over the engine under the tank. Only failed during a long ride at high speed when the engine is putting out a lot of heat.

Is the coil located over the engine so it gets the full engine heat? I have found that ohm readings are not that reliable on a coil that is breaking down due to heat.

I'd buy an inexpensive coil and try it.

**mattbujor** · 12-24-2011, 05:04 PM

Yes it is located right over it. Where could I find a coil that might fit on this bike? Is the only difference between coils the wire connections? Ive been looking for a new coil but just dont know too much about tehm

**mattbujor** · 12-24-2011, 05:06 PM

What will changing the coil do however? IF its in the same position won't it soon develop the same problem?

**barnone** · 12-24-2011, 06:51 PM

Originally Posted by mattbujor

What will changing the coil do however? IF its in the same position won't it soon develop the same problem?

Hey, I am not guaranteeing this is your problem but you gotta do something...

Hopefully it's just a defective coil. Might develop the same problem but at least you would know. Then you could relocate it somewhere else.

Lots of inexpensive coils on Ebay at

http://motors.shop.ebay.com/__?_from..._id=1078622241

You need to match it up.

Or get one from scooter depo if you have a lot of patience.

Or match it up at a local shop.

**MJH** · 12-26-2011, 12:30 AM

That seem high too me, I would expect 0.5 -1.5 ohms on the primary or something like that, then you need to also test the ground which should be much higher 6-13 thousands Ohms. It can test fine that being within that range, but still be failing under load. There is no way to easily test the coil yourself under load, you would just replace it if it is suspect and the specific ratings should be provided by the manufacturer.

Here is a generic one.
http://www.amazon.com/dp/B0015MEGZ2/...SIN=B0015MEGZ2