GSX250E bogging down after a mile - dirty petrol ?

[zed1015]

Going by some of the previously supplied info it appears that you may have had several issues including undercharging.
Your latest problem sounds like a drained battery with just enough juice to give the ign light a glimmer.
You should have around 13.8 volts when revved so you need to check the charging system and reg/rec etc and also investigate any possible shorts in the wiring.

 

[ukjules]

will check this eve.
be assured this thread goes on forever and the fix or fixes will be known. thanks.

 

[ukjules]

update : so still bogging down.

-cleaned carbs previously many times
-changed to other coils that did test OK on the bench
-removed inline filter
-swilled out tank

still bogging down after mile run.

-redid stator wiring and checked briefly all wiring for looseness Inc pickups.
- did stator test , ohm , and volts.

resistance between 3 wires
a-b 1.4 ohms
a-c1.4 ohms
b-c 1.4ohms

each stator leg to earth on battery
a = 1
b = 1
c = 1
(this is correct I am told )

on Ac volts test each leg of stator to each other
a-b 2k revs 33v 3k revs 58v
a-c " "
b-c " "

Battery test get ok readings when increasing revs .. 3500 plus...

- did a wire wiggle test under seat.

Found a 6 pin block that when wiggled caused a similar bogging down issue .

will clean tomorrow.


q) how do you test pickups?

q) how do you test rectifier / regulater ?

 

[Cipher]

What's the 6 pin block connected to?

 

[ukjules]

no idea at moment . of bike is running and I pull it its stops! wiggling causes a electricy type of bog down !!
so there are dirty or like connections.

 

[Cipher]

Well I only see two six wire connectors on the bike one is for the ignitor the other looks to be the instrument cluster.
Whoever scanned the pdf was low on HD space or a sadist as its just legible enough to force you to try and read it.



The wires connect the pulsar pickups to the ignitor and to the coils.

 

[Cipher]

But wait there's more an actually legible scan here
https://gsarchive.bwringer.com/mtsac/~cliff/storage/gs/GSX400_GS450_wiring.pdf

 

[ukjules]

the pickups connector has 4 wires.

the one in question has 6 and is underneath near air box.
YES JUST REALISED IT IS COMING FROM OR TOO THE IGNITER !!

p.s I think it is a simgle phase rectifier on it as is so small and 3 wires are different colours.
other type have 3 wires same colour like on my GS.

 

[Cipher]

Nay laddie its 3 phase. https://gsarchive.bwringer.com/mtsac/~cliff/storage/gs/GS250T-300LZ_manual-82.pdf

 

[ukjules]

Can't access that.
whatever the fact is mine has 3 different coloured wires going into the same. and so do my gs550 ones .... so yes prob is as you say .......

bogged down again. so I am beginning to thibk its the pickups.
never known such a problem to sort. iv usually got it by now. I dare not go more than a mile on it now .

anyone any ideas what next ?
I am convinced now at least it is not fuel related. as it runs for a while fine through all revs)

 

[ukjules]

Will do the MM test on the pickups.
Do you test for ohms on each pair ?
if so what setting ?

 

[Cipher]

manual says 60-80 OHMs and calls it a signal generator
Why canou get the pdf firewalled

 

[salty_monk]

It does sound like your RR is going out or has a bad ground (but those stator numbers are also a little low). Wouldn't cause your issue though.

Have you taken the petcock apart? My bet would be that either the filters are doing their job & are now causing too much restriction so the flow of petrol can't "keep up" when you've been riding for a bit or there is crud in the actual petcock itself.

I had a very similar thing with a tank once. Worked fine for a while with a filter. Filter got full. Changed it. Got full again. Removed it, was good for a while then same issue - petcock was blocked up. Eventually after a lot of regular use it sorted it out and a couple of years later I coated it with POR 15 inside the tank (that also sorts out the rust issue...).

Good luck!

 

[Grimly]

Mine would conk out at the 1/2 full mark. Turned out to be the petcock filter riser, which had become coated with varnish over the years. A full tank would force enough fuel through it to run ok, but when it got low enough, the flow was insufficient.
The cheap petcock was a close enough copy that even though the petcock was crap, the filter was a good fit, so that went in and I had no subsequent trouble.

 

[ukjules]

Fuel:
So you think it could still be fuel ?
Can I add that indo have a new petcock on bike and it is NOT standard. It has worked ...... oddly I have the standard one on my GS550E which has never gone wrong .
Do you think it's worth swapping them over just to see ?

I'll do some tests on pickups and stator one more time and report.
I note pickups (signal generator ) from cmsnl is 180? !!!!!

am losing the plot on where to start again on this .

 

[ukjules]

analysis tests:
re did the stator connections
resistance between 3 wires
a-b 1.3 @ setting 200
a-c 1.3 @ setting 200
c-b 1.3 @ setting 200

can someone tell me what this is in English? does it mean 1.3 ohms ? or 13?
(my notes say a new stator should read 20 ?) is that right ?

note my gs has exactly the same readings or 1.3 a d is OK.

pickups : signal senders
4 wires come out one earth and 2 to pickups each side. another goes to underneath pickups.

so bw to each of 2 pickup wires in turn show
.063 ohms on both on 2k setting .
what does this mean 630 ohms
if so they are fine

 

[ukjules]

OK.
did the above and same after 1.5miles.

I am.back to fuel ....
no I have not taken fuel tap apart.

I may get round to that today .
I am assuming as it runs fine for periods I will leave the carbs.

remember I have removed the inline fuel filter ! that is no longer a possibility.

where to a get a genuine gsx 250 petcock ? wemoto the pic is not right

anyway clean the petcock next

 

[ukjules]

a stock petcock put on and it happened again within the usual 2 miles.
it clearly is not fuel carb related now.

one thing as j was testing in dark , lights sort of dimmed at times and when I put on brake. in the end it started to bog down then just the dashights and nothing else.
no horn, start , lights, indicator.... dead.
leave for 5 mins say and it will start sometimes OK sometimes in the bogged down state.

battery is at 12.4v and when revved goes up to 13.5 when I can test it.

 

[zed1015]

As already mentioned.
Charging problem or possibly bad electrical contacts in the associated wiring.

 

[ukjules]

plan:

Regulater:
having checked many connections I intend to rig up another rectifier / regulater (RR). Don't have one that fits so will be a temp bodge.

Stator:
As it has same readings as my GS i have to assume OK.

As it seems to happen with regularity now in under 2m out, I think it must be a unit getting hot.

so swap another RR .
Perhaps do the heat up pickups test ( sometimes they test good but can break down when hot.

BUT saying that as bike bogs down and stops dead and zero elec works bar dash lights it is so looking like charging.

with someone could answer my question on MM readings.
1.4 at 200 ohms stator
.065 at 2k ohms pickups bike cold
what is the number in reality for both ?