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Post by wuckfitracing on Jul 16, 2017 20:53:46 GMT 1
First decent run today after MOTing Insuring and Taxing her on Friday. Runs nice and crisp whilst on the side stand. Sat riding along still really crisp and will rev to 9K easily. Then after 5 minutes of riding starts to miss as if fuel starved, then maybe 10 seconds later stalls and free wheels to a stop. Thoughts were, ran out of fuel. No, still some in tank, Also pulled (new) fuel pipe off tank before (new) filter and fuel is coming out of tank.
Leave it 3 maybe 4 minutes and it will start again. Rode home keeping it around 5000 rpm. Made it maybe 1 mile then stalled again. Leave it 3 to 4 mintues, it fires up again.
I am right in thinking all the fuel is being used in the float bowl and it cant keep up. Could it be float height.
Thoughts welcome, I am new to carbs and RDs.
Thanks in advance
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Post by stusco on Jul 16, 2017 21:01:34 GMT 1
it sounds like it's the coils on your stator breaking down when they get hot one of the experts will tell you exactly when they come along you could do a search it is quite common
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Post by Yogi on Jul 16, 2017 21:08:29 GMT 1
Have you tried it with the fuel tap in the pri position(if it's got one),that will eliminate vacuum problems
Also check the breathers not blocked on the back of the tank and the filters clean in the tap
Matt
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Post by jackjabba on Jul 16, 2017 21:28:07 GMT 1
Could be the HT coil. Had the same problem on my old Triumph car. Gets hot and misses and then stops. Let it cool down and off she goes.
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Post by wuckfitracing on Jul 16, 2017 21:48:08 GMT 1
Fuel is pouring out of the tank, Took fuel cap off no change, I think it may be the new in line filter
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Jul 16, 2017 21:53:18 GMT 1
I had one that did the same. Turned out the float valves stuck were stuck. I replaced them with OE ones from Yamaha and it was sorted. If that's your problem you might be able to get away with just cleaning them.
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rz350k
L plate rider.
Posts: 15 
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Post by rz350k on Jul 17, 2017 4:17:59 GMT 1
I had the same issue and rewinding the stator hi-lo speed coils in the stator fixed it . I replaced everthing else including loom and only rewinding the stator fixed it .Sorry a hassle I know. It was an 86 Rz250r, regards, James.
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Post by wuckfitracing on Jul 17, 2017 22:07:01 GMT 1
So this evening I checked float levels, both are OK and the float valves are working/shutting on/off. In the PRI position on the fuel tap, fuel is flowing through the in line filter to both carbs. Only found a pipe that had a small split in it although nothing was leaking out. Going to try and replicate fault again tomorrow night and see if its lost spark when it does or whether plug is wet.
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Post by wuckfitracing on Jul 18, 2017 20:00:45 GMT 1
Right, its not fuel related. Once warmed up it I can ride it for all of about 1/2 mile or less then it cuts out. Leave it 4/5 minutes it will restart and ride again for a while then cuts out again. Checked voltage at battery 13.2 Volts. This increases when engine is running. Cheapest option now (after testing coil) is new coil.
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Post by marsbar350 on Jul 18, 2017 20:04:10 GMT 1
sounds like the stator is breaking down do a search on here on how to to check  |
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Post by Shytalk on Jul 18, 2017 20:35:37 GMT 1
Surprised nobody has mentioned the CDi, usually happens with the earlier valves CDi's but nothing to say it can't be the same on the later ones too.
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Post by boost on Jul 18, 2017 20:59:09 GMT 1
i had a similar problem on an 84 250 ypvs bike would start fine but would intermittently cut out, amount of riding would vary could ride it 1/2 mile 1 mile 5 mile or ten foot and it would cut out, sometimes I had to wait a few mins before it would start again sometimes it would start straight away turned out the cdi was screwed
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Post by wuckfitracing on Jul 18, 2017 21:39:38 GMT 1
Yep Cdi is also a maybe. Just going through the tests in order of cheapest first (coil).
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Post by wuckfitracing on Jul 18, 2017 21:40:30 GMT 1
Things are conspiring against my target of getting it back on the road for the CMC 2 stroke Sunday in Chesterfield
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Post by Shytalk on Jul 19, 2017 6:04:34 GMT 1
Where are you located?
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Post by wuckfitracing on Jul 19, 2017 8:59:44 GMT 1
Whitwell near Worksop.
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Post by Shytalk on Jul 19, 2017 10:32:29 GMT 1
I'm working in Sheffield on Friday (unless things change) and can drop down to you early afternoon if you're going to be around, I have a stator, CDi or 2 and a couple of sets of coils if you're in a position to test them on your bike? |
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Post by wuckfitracing on Jul 19, 2017 12:40:41 GMT 1
Wow that's a very kind offer. I'm going to collect a new coil today and try that. We've had some odd readings from the old one that don't match the spec in the book. Fingers crossed.
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Post by Shytalk on Jul 19, 2017 12:45:40 GMT 1
Good luck, just let me know if you need the other bits.
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Post by wuckfitracing on Jul 19, 2017 21:11:38 GMT 1
Well after further tests on the coil, its not that.I Did find a suspect wire from the CDI that was just pushed into a connector without a spade on it, it just fell out when I unwrapped the insulation tape. Secured it properly and went for another spin. Died on me again after 5 minutes. wait 4 mins ride again etc etc got me home eventually. so next step is CDi
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Post by olnmfc on Jul 19, 2017 22:30:38 GMT 1
Let me know how you get on could you? It sounds similar to the issue I've just posted on the thread below from 8 years ago...
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Post by wuckfitracing on Jul 20, 2017 7:45:12 GMT 1
8 years ago !
I hope it doesn't take that long .😄
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Post by mikee on Jul 20, 2017 12:38:34 GMT 1
is it an electronic rev counter ? if so does the needle drop quickly when it stalls , if so id suspect cdi/stator
had a tdr that did this
mike
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Post by wuckfitracing on Jul 20, 2017 13:02:06 GMT 1
Yep needle just drops. I have another CDi arriving, so will try that next.
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Post by wuckfitracing on Jul 21, 2017 16:18:56 GMT 1
Right ho. Another puzzle. My bike has a CDi that is not original. It has had a 29K-50 spliced into the loom. So with this wrong spec one it fires up first kick and runs, gets warm then dies.
So I took up an incredibly kind offer from Shytalk to lend me 3 spare CDis to see if the CDi is at fault. These are 1UA-50 Cdis. I have wired each one of these 3 CDis in( not all at once) and all I can get is the occasional back fire out of the exaust. It wont start.
Does anyone know what are the differences between 29K-50 and 1UA-50 CDis and is there another electronic component that is required to return it to the original 1UA-50 spec.
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Post by wuckfitracing on Jul 21, 2017 18:07:03 GMT 1
Puzzle fixed. Turns out you need to swap the green and red connecting wires over, depending upon which CDi you are using. I found an article by liamo on this forum explaining which CDi will run with which pickup and Stator and what to do to get them to work.
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Post by olnmfc on Jul 21, 2017 20:13:48 GMT 1
I have a 29 box on my hybrid.
The other news is I sorted my misfiring issue. Turns out it was a (very) bad block connector running to the cdi.
So thanks to forum members (old and new!) for pointing me in the direction of the cdi. As the manual says, check the simple (& cheap) things first..
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Post by wuckfitracing on Jul 22, 2017 15:49:23 GMT 1
Update took my bike for another test run with another CDi and guess what. wait for it.......
It did the same again. died on me,cool down, start first kick, 100 yards died.etc etc.
So where can I get the stator rewound. Sheffield, Derby area.
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Post by wuckfitracing on Jul 23, 2017 11:27:06 GMT 1
I give in. Till next week. I've taken the BMW K1100RS to CMC instead.😕
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Post by wuckfitracing on Sept 7, 2017 22:38:56 GMT 1
Finally got round to fixing it. Turns out the first relpy to my problem was correct. Stator was failing when it was warm. I tried a stator pick up kindly supplied by Shytalk but it still cut out so it wasnt that. So the only solution was a new stator from Norbo. After a couple of successful 15 minute runs this week (in case it left me stranded miles away from home) I went out tonight on an hour run and it ran faultlessly. Many thanks to all who have offfered advice and help. I may have pulled the remainder of my hair out left to sort it myself.
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