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  #1  
Old 28-03-2006, 09:22 PM
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Default SR125 bobber keeps breaking down

Hello there. i know i havnt given a great deal to the forum yet but i cant fathom out this problem for the life of me and you are the only guys i can think would have the answers. I got my little 125 bobber out of storage from the winter, got insured the lot but now it keeps breaking down.

i dont know whats causing it but the carb is spotless inside, the battery is charged up good and all the connections seem good.

the problem isnt all the time either. saturday it was roaring about great no problems and today went out on it but when it came to coming home it died. it will run for a while and then stop. yet it runs great before it suddenly stops so i wouldnt expect it to be a fueling problem?

any ideas?

Just incase your wondering heres a photo of the bike


Thanks in advance

Jules
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  #2  
Old 28-03-2006, 09:37 PM
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Is the carb jetted to suit the filter?

Is the neeedle valve clean?

Is the fuel tap clean?
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Old 28-03-2006, 09:38 PM
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i have no idea
but thats a good looking bike, my boy now wants 1
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Old 28-03-2006, 09:38 PM
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Like the bike
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Old 28-03-2006, 09:46 PM
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grav i have completely dismantled the carb and rebuilt it, all seemed good

and it was running great on saturday(and all of last summer)like that so i wouldnt think the jetting would be that far out? if it was surely it would run rough and die not great they die? also the filter is partially masked off with tape at the mo

Thanks for the kind words about the bike. you wouldnt believe the price of insurance on it on a CBT lol, full license is planned for the summer at some point i think

Jules
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Old 28-03-2006, 09:52 PM
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Is the spark plug in good order?

Is the plug cap in good order?

Is the HT lead in good order?

Tis a nice little bobber you have there.
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Old 28-03-2006, 10:01 PM
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I would try the fuel cap, sounds to me like the vent is blocked or partially blocked, this would casue it rto run great when first started after being sat, then after longer period of running to then conk out as is out of fuel, if the block is partial, then the vacuum will slowly decrease, you try it again and it will work

make sure the vents not filled with polish, thats the normal culprit,

as to a guide of how powerful that vacuum can be, I was towed out of the black wall tunnel by the AA whn the fuel tank on an escort imploded!!!!!! this had been a crap runner and was down to blocked vent

mk3 cavs suffer from it, easy fix was hot wire through the plastic to make new vent hole

oh and love the bike
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Old 28-03-2006, 10:19 PM
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If none of the above works it could be the ignition coil breaking down, usual symptom is they work ok until they get a bit hot and then breakdown and once they've cooled down again they will work again.

Very neat little bobber
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Old 28-03-2006, 10:42 PM
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first thing i tried was the vent cap in the fuel but even with the tank lid off it does it.

i was thinking it may be the coil but why would it have spats of running fine...

when i say i leave it... its less than a few mins and it will start and run for a short time... so i will run it till it dies tomorrow and then pop the plug out straight away and see if it still has a spark, could also be the leads or cap though? i did notice that the first time it broke down the engine becamse skittish over bumps in the road.

the engine has done under 30k so wouldnt expect anything to be broken down yet?

Jules
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Old 28-03-2006, 11:08 PM
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30 thou on an sr is good going....

the coils on my old z650 used to break down when they heated up but it ran rough first

inside of your tanks not rusty or got a bit of water in it has it??could be semi blocked fuel tap causing temporary fuel starvation,and by the time youve checked the bowl its full again...

does sound like fuel to me

nice little chop by the way
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  #11  
Old 29-03-2006, 04:31 AM
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Lightbulb Another thing to check!

Cool ride.

Have you checked ignition switch as these can go tits up.Most likely one of the aforementioned gremlins.Just thought I'd add my t'pennerth worth.
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Old 29-03-2006, 05:41 AM
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fantastic looking bike
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  #13  
Old 29-03-2006, 10:06 AM
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Quote:
Originally Posted by IPC_Jules
i did notice that the first time it broke down the engine becamse skittish over bumps in the road.

Jules
Sounds to me like an intermittant wiring problem mate a bad connection or something like that. When the motors running, try checking our the ignition wiring, by shaking each wire and connection, see if it falters again..Also check the fuse holders and fuses are clean and making good connections..
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Old 29-03-2006, 11:05 AM
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Quote:
Originally Posted by SatinBlack
If none of the above works it could be the ignition coil breaking down, usual symptom is they work ok until they get a bit hot and then breakdown and once they've cooled down again they will work again.

Very neat little bobber
and they especially do this if it had been stored for a while
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  #15  
Old 29-03-2006, 04:57 PM
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i dont think its the wiring connectors. wont be the fuses as it only has one and ive checked that.

im going to try and get another coil with HT lead.

i dont think its fuel starvation as the inlet rubber is always damp when i pop the carb off after it stops

thanks for all the help so far.. im determinded not to let it beat me


Jules
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Old 29-03-2006, 05:05 PM
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If you want to try another coil, you can borrow one off me to see how it goes but I will want it back at some stage
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Old 29-03-2006, 05:06 PM
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Also you were saying about insurance on cbt being high. I passed my test yesterday and phone them to tell them, and it didnt make a pennys difference to my premium!!!
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Old 29-03-2006, 09:48 PM
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i think i might have found the problem... a dodgy plug from the loom to the coil...

went to mates to pick it up (i pushed it there when it broke down cos it was too far home) and it started ran a while then died. so i whipped the plug out and it wasnt sparking... theres the fault im thinking

anyways gave the coil to loom plug a squeeze as its exposed under the tank and testing the starter and woop a sweet popping crackling spark yet it still skipps when i hit rough terrain so friday i will remove the plug and solder the wires together to see if that helps.

i dont know why its doing it but i checked the plug before and it hasnt changed since its been in storage

thanks for all the help so far guys

Jules
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  #19  
Old 29-03-2006, 11:13 PM
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Hope thats the end of ya troubles
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  #20  
Old 30-03-2006, 03:53 PM
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If you've got time take all the connectors apart and give 'em a good skoosh with WD40,it's surprising what a wee bit dirt or damp can do.Even if you ain't got time do it anyway.
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Old 30-03-2006, 05:38 PM
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Thumbs up Can we see this bike featured somewhere

This is a really sweet bike. It would be good to see a write up on it as an encouragement that you can produce something really nice with a learners bike
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  #22  
Old 30-03-2006, 11:30 PM
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i had already tried cleaning all the plugs think it might be cos its not such a good fit these days.

im rebuilding the bike at the moment slowly polishing up the covers and dressing some of the frame stuff then will get it all finished off to sell in the summer. will get some nice piks of it and post a thread then so you can all see it properly if you want. for the time being there are piks of it here if you want to see it

http://www.ironpumacustoms.uwclub.ne...cher/index.htm

the media and construction diary have photos of it

glad you like it

Jules
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  #23  
Old 31-03-2006, 12:02 AM
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odd, very odd but i love it. are we looking at the future here
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  #24  
Old 01-04-2006, 12:32 AM
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Try E-bike insurance next time. My lad has not done his CBT yet, and I am on as second rider and it cost £101 Full comp.
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Old 01-04-2006, 09:11 AM
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so is it running propper then.............i had awful probs with old bonnie similar one minute fine next stops..........turned out to be a dry joint (bad soldering) on kill switch......bypassed now fine.
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Old 01-04-2006, 11:52 AM
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Had the same problem with a trike of mine, turned out the coils hadnt been tightened down properly and the earth was dodgy.
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  #27  
Old 01-04-2006, 01:54 PM
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Lightbulb oNE OFF WIRING?

Have you got a diagram of the wiring on the bike?Work through it that way??If you have one put it up on here and it'll get sorted-I hate electrikery.
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  #28  
Old 01-04-2006, 03:47 PM
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i took the haynes one and modded it, almost right but it still wont start unless its in neutral unless you pull the clutch but cos i didnt wire up the clutch sensor it has to be in neutral. i will play with it when i repaint the frame but for now im a bit busy with the trike loom.

anyone good at xj900 wiring? ill start another thread i think

Jules
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  #29  
Old 01-04-2006, 04:01 PM
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I do love your work , most impressive , some weird and wunderfull stuff, respect given truly deserved.
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  #30  
Old 01-04-2006, 04:12 PM
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thanks

i can post some photos of the other bikes ive built if people want to see them?

Jules
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