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Post by scooterbooter on Feb 26, 2023 17:25:21 GMT
I think its fuel starvation, it just kind of goes bbbbbbbwwwwwwwrrrrrrr.... then sometimes kicks back in sometimes stalls altogether. Only ever done this since switching from si24 to si26. Any one got any experience of something like this? Or anyone had success with fast flow taps etc....... many thanks scooterbooter.
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Post by scooterbooter on Feb 26, 2023 17:28:59 GMT
Oh yeah it's not the seals I tested them. I suspected oil seal. Tested was fine. It got the better of me so I did a complete strip down ,well 3 actually. All tested all looks good. But she still cuts out. Very rarely happened under 1/2 throttle.
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Post by scooterbooter on Feb 26, 2023 17:31:57 GMT
Also anyone wants a chat about timings . I'm getting nervous over mine. Hhhmmm.
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Post by adrian on Feb 26, 2023 17:50:48 GMT
Does sound fuel flow related, has the fuel pipe got a kink, or too long ? I'm using a bgm fast flow tap, had 2 sip ones and they both leaked and I'm running a 28
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Post by scooterbooter on Feb 26, 2023 18:28:40 GMT
The pipe is old (5 years)but looks OK. I've trimmed 1/2 inch off to try make it sit in a different way. Made no difference. We're you drying up with 28? If so did it sound like mine does? And did the tap do the job? I may get one along with a hose.
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Post by adrian on Feb 26, 2023 20:36:59 GMT
I fitted the 28 along with new pipe and fast flow tap and haven't had any problems with fuel starvation, added all this when I kitted the scooter
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Post by scooterbooter on Feb 27, 2023 9:49:45 GMT
I just had a thought , could I be super leaning out? So while I wait for my new fuel line I'm going to fill back in the heart shape in my filter , jet accordingly and see what happens next, like i said just a thought.
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Post by gpowell on Feb 27, 2023 17:33:53 GMT
A standard tap should cope okay, but you cant go wrong with a fast flow tap.
I use a fast flow tap with a 26SI # and have never suffered fuel starvation.
The air filter mod needed very little jetting adjystment on mine.
Need to understand your set up to try and help.
Standard taps are fine upto 128 MJ.
Ive found little difference between unmodified 24 and 26SI.
Thats sounds to me more like a soft seize
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Jock
High Number
Posts: 184
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Post by Jock on Feb 27, 2023 19:00:30 GMT
Possibly a internal channel on the carb - high pressure air - blow the main body out , that might be it
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Post by gpowell on Feb 27, 2023 19:36:05 GMT
Strip carb and clean thoroughly, strip tap from tank, check tank not gunked up on the internal filter restricting flow.
What top end and what jets in tbe 26SI.
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Post by scooterbooter on Feb 27, 2023 20:31:41 GMT
Hello thanks for the reply... yeah I was thinking soft seize... I had 125 mj be5 and 120ac. That's with a parmakit puffo. Unfortunately it's still doing it even with the filter filled back in and at the time it was super duper rich on the verge of stuttering.
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Post by scooterbooter on Feb 27, 2023 20:35:16 GMT
Hi jock is that when your constantly emptying your carb? Sorry I'm self taught mostly and know very little technical terms!
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Post by scooterbooter on Feb 27, 2023 20:37:11 GMT
Like the stack I mean. opposed to the bowl. Which can be different things can't they? I don't know. I think I do . But probably don't!
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Jock
High Number
Posts: 184
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Post by Jock on Feb 28, 2023 0:59:52 GMT
HI what i am on about , is remove all jets etc - remove carb body from engine + strip it bare - then take to petrol station + blow it through with air - warning high pressure air can kill ,watch you do not have any bad cuts etc or better still use long nosed pliers to hold the body - advise safety specs in case a bit of crap etc comes out - done it several times over the years - nothing to worry about -torque it back up to the correct settings or you can twist the body out of shape - i have done it only one time -glad to help
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Post by phattanglo on Feb 28, 2023 6:39:28 GMT
It does sound fuel related, but my 125 did the same thing a few years ago ie soft seizing under load, going up hills etc.
It turned out I had too hot a spark plug, so changed it for the correct one and had no more problems.
If all else fails, try a cooler plug.
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Post by scooterbooter on Feb 28, 2023 12:47:55 GMT
Yeah I've tried different plugs , ht, caps etc don't make a difference. Yeah I will clean out carb I did it at the start of this but only with an adapted foot pump so I'm niggling about that now.... oh dear. Hurry up fuel pipe. I need to discount that. I'm tempted to pull out the wiring i really don't think it's electrical I really don't want the expense of potentially superfluous parts so I'm stopping myself for now, but it's hard!
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Post by scooterbooter on Feb 28, 2023 12:50:25 GMT
Oh yeah petrol station air line. Top tip never thought of that! Top marks for tightness! Right up my street that one!
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Post by scooterbooter on Feb 28, 2023 14:53:18 GMT
Oh yeah and it runs lovely with 'stock' filter. I probably don't need a drilled one . No performance loss noticeable.
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Post by scooterbooter on Mar 9, 2023 14:44:07 GMT
Gpowell got it. Knackered tank filter.so even after cleaning carb it still continues blocking carb. aaahhhh.What a genius 👏 🙌 😍 👌 ❤! Thanks to all who had punt. Completely overlooked the filter silly old me.
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Post by gpowell on Mar 9, 2023 20:36:37 GMT
Great news!
It would seem to have been soft seizure due to restricted flow.
I would have to have the top end off now to check....
If it has been nipping a light hone and new rings will refresh the top end, then you get rejet.
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Jock
High Number
Posts: 184
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Post by Jock on Mar 10, 2023 0:02:26 GMT
Glad the problem has been found  |
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