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Post by dungbug on Jul 12, 2011 17:23:15 GMT
Noticing a slight problem with the GN, she revs fine and pulls through the gears accept when I put it into 5th then it seems to 'bottom out'. The power seems to tail off and it de-celerates slightly, if I ease of the throttle and wind it back gradually it'll pick up again. I don't know when it was last serviced so could be a cacky plug or something basic, she fires up & idles without any problem, don't think it's fuels related, kinda 'feels' like an electrical problem. The bike in question is a 2000 Suzi GN125, any pointers/advice would be appreciated. Thanks.
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Post by TerraRoot on Jul 12, 2011 17:34:35 GMT
carb diaphragm rubber, kit from a dealer is only about a tenner (euros thats is) very common problem with small suzukis.
pop the top off the carb and check is there is any holes in the big rubber diaphragm, try sealing the little pin holes with a drop of superglue just to get you around the place, replace very soon as more holes will appear quickly.
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Post by dungbug on Jul 12, 2011 17:54:20 GMT
Cheers Terra, that's grand. ;D
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Post by dungbug on Jul 12, 2011 21:48:00 GMT
Is this a big/difficult job to do? I'll be having a look this weekend at it. Also any idea where I can get the Diaphragm? Wemoto don't list it. Cheers.
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Post by TerraRoot on Jul 13, 2011 8:30:14 GMT
utter piece of piss, loosen the carb rubbers and rotate the carb top towards you. undo the four screws on the top, pop the top off and theres the rubber, now i think there is two screws holding on a plate which sandwiches the diaphragm to the slide, undo and swap in the new one. have you tried the superglue first? no point in finding a kit if (for example) all your valves are burnt out.
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Post by dungbug on Jul 13, 2011 10:03:50 GMT
Cheers Terra, haven't checked the diaphragm yet. Will probably look this weekend, I did notice this morning that the rubber between the carb & head has some hairline cracks in it so possible airleak there I think, or the potential for one anyway. Might be an idea to replace this at some point soon, overall performance seems ok, she revs nicely & get's up to a reasonable speed but then seems to run out of steam around 45mph/50mph. I did noticed that the choke has to be on for it to keep running, if the choke is closed she cut's out. I guess this would point towars an airleak somewhere, the extra choke seems to be keeping it going.
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Post by TerraRoot on Jul 13, 2011 15:57:20 GMT
I can't fix everything over the net, there are so many things that could be wrong.... is there an air filter in it? has the last owner fitted a smaller main jet? (happens a lot on things like c90's people trying to eek a few more mpg's) hairline cracks are probably nothing, but a quick way to test/fix is just to smear thick grease over it and see if the idle speed changes
still the most likely candidate is the diaphragm rubber, they always break
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Post by dungbug on Jul 13, 2011 18:01:52 GMT
Hey Terra, I got home tohinght & sprayed some WD40 on the rubber between the carb & and head & the rev's picked up for a few seconds then settled down again so that's definately iffy. I'll pull the top of the carb off, probably be this Friday afternoon as I've got half day leave for a job interview.......Hopefully I'll have time after the interview to get home & look at the carb. The previous owner was the local training centre who've had it for a couple of years so I'm assuming nothing has been changed to 'improve' MPG or performance. It's looking like they've increased the fuel mxture to compensate for the leaky rubber, I'll probably have to make some adjustments when that rubber is changed as it'll be revving more.
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Post by TerraRoot on Jul 13, 2011 18:47:56 GMT
thats good news, bodge some silicone sealer all over in the intake rubber and head to the pub with the money!
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Post by dungbug on Jul 13, 2011 18:56:40 GMT
thats good news, bodge some silicone sealer all over in the intake rubber and head to the pub with the money! Like your thinking ;D Cheers for the help.
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Post by dungbug on Jul 16, 2011 9:42:50 GMT
I had a go at checking the diaphragm yesterday evening, unfortunately the head to carb rubber diddn't take too well to the carb being twisted & the cracks became more like splits The clamps were very loose btw but I think the rubber was too brittle to be pulled about, so I bodged sealed the cracks with some heavy duty adhesive that I used indoors the other week. She starts & runs fine & seems to 'lag' as badly as she did before so this rubber was certainly part of the problem. so plan is to order a new one & diaphragm & change them both at the same time rather than replace the rubber & then have to try and repair the diaphragm. If the diaphragm is fine I'll leave it & know that I have a spare, if it needs changing I've got it to hand. Just need to find a parts supplier now, Wemoto don't seem to list these bits on their website.
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Post by TerraRoot on Jul 16, 2011 20:06:44 GMT
scarp yard dr125 carb? no diaphragm in that same engine.
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Post by dungbug on Jul 16, 2011 21:01:04 GMT
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Post by TerraRoot on Jul 17, 2011 7:30:23 GMT
thats the one, pretty good price there make sure it's the same bore or bigger, you don't need to lose any bhp when you've only got 10!
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Post by dungbug on Jul 17, 2011 8:41:02 GMT
you don't need to lose any bhp when you've only got 10! LOL ;D ;D
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