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Post by ibbo on Aug 18, 2008 14:59:06 GMT
Hi all, Ive got a bit of an odd one for you. My 1999 diversion 600 has developed a rather strange fault. When its in gear and going along (as in when theres weight on the back wheel) it will only rev to between 5500rpm and 6500rpm and will then just stop revving. I get a rather strange, quite quiet, gurgling noise and no matter how much throttle I give it, the revs just sit there and some times they even begin to drop to just below 4000rpm and then start to rise again. The weirdest thing is it only started after I brought it back from Bournemouth to bedfordshire, put it in the garage came back to it next morning and it started playing up! Also it will rev above 6500rpm in neutral. I have cleaned the carbs out with redex, always use super unleaded and have put STP octane boost and system cleaner through. I have also changed the spark plugs. The bike has done a lot of miles now (over 75k.) Could it be that one of the jets is blocked and i didn't clean them right? Piston rings? Regulator/Rectifier??? Please help guys I'm at the end of my tether with the bloomin thing now.  CHEERS! |
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Post by darren on Aug 18, 2008 17:57:33 GMT
not quite sure what type of gurgling noise you are trying to describe, is it a gurgling noise from the tank, this could be a breather problem, make sure this is clear first of all, and I redex is a pet hate of mine, if you are going to use a cleaner use forte, its finer and better quality
Failing that then a good bet would be to check all ht leads to make sure you are not arcing out anywhere, and that the coils are doing there job, if its had that many miles you are looking at some componant failure at some point, nearly always carb-coil-alternator related. reg/rec shouldnt cause those issues, a good bet would be to strip the carbs and clean all through with compressed air and check float levels incase its been starved of fuel, and make sure all breather pipes and air filter is clean and clear
do you have a manual?
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Post by bobh on Aug 18, 2008 18:46:32 GMT
I think Darren's covered pretty much everything.
To me it sounds more like fuel than ignition, although the ignition things are probably easier to eliminate first.
I wonder if there might be some water or other carp in the fuel? Did you fill it up shortly before it started? Drain the float chambers and check the fuel filter.
Good luck - Bob
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Post by darren on Aug 19, 2008 2:28:05 GMT
did you run on reserve for a while at any point in the journey, you could have picked up some carp from the bottom of the tank, what condition is the fuel filter in?
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Post by HRHpenfold on Aug 19, 2008 10:17:38 GMT
yep, blocked tank breather, classic symtoms, and fairly common, blow through with compressed air  |
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Post by ibbo on Aug 19, 2008 12:12:13 GMT
Blocked tank breather, where abouts is that on the tank? Attached to the fuel tap? (Sorry, no haynes manual yet!)
Thanks for all you help guys, hopefully it'll be good as new soon!
;D
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Post by HRHpenfold on Aug 19, 2008 14:04:41 GMT
Blocked tank breather, where abouts is that on the tank? Attached to the fuel tap? (Sorry, no haynes manual yet!) Thanks for all you help guys, hopefully it'll be good as new soon! ;D under the locking fuel cap, alternatly, one of the pipes that hangs down neer the stand |
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Post by sotirisp on Aug 19, 2008 14:54:03 GMT
Yamaha Diversion is impossible to pick rust or any other garbage from the bottom of the fuel tank because it does not pick petrol at all (or anything else) from the bottom of the tank.
If you check the fuel tap mechanism (the part of it that goes into the tank) you will understand what i mean.
And, there are also two filters IN the tank fuel tap. One for ON position and one for RES position which are dependable on the fuel level inside the tank.
@ibbo
if not the tank breather then,
a thorough clean check of your carbs should reveal the solution to your problem.
I'd check the diaphragms too for any imminent cracks or tears...
And my advise: don't ever use REDEX again. Trust me...i've got a reason (spent hours wiping out its reddish garbage deposits from my carbs' inside).
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Post by darren on Aug 19, 2008 15:57:53 GMT
Yamaha Diversion is impossible to pick rust or any other garbage from the bottom of the fuel tank because it does not pick petrol at all (or anything else) from the bottom of the tank. all it takes to get carp from the bottom of the tank is a faulty reserve/main line filter situated inside the tank attached to the petcock, if it is split etc, movement of the bike causes swishing around of fuel causing carp in the tank to move around, and its not impossible for it to find its way within the fuel lines through a faulty petcock filter,reserve or main line, so sorry, I have been there and had that one, I had a split filter on the ZX, as I was getting deposits in the inline fitted filter, and the petcock filter had a split in it, and I personally understand what you mean, been messing around with bikes since I was 16, so thats ermmmm am ?? now and that makes it blur ermmm along time as was said before, check breather pipe, and if you have to strip carbs then as sotirisp also mentioned the diaphrams need to be checked also while you are in there BTW you av a PM regarding manual |
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Post by CD on Aug 20, 2008 18:34:54 GMT
Check the breather pipe hasn't got trapped last time you had the tank off.
There might be an ignition problem. The gurgling sound might be what happens when the carbs are opened wide and the engine isn't revving properly.
It might be the chokes (cold start jets) are sticking open and semi flooding the engine.
Red stuff in the carbs can be Redex, but carpy old petrol also leaves red deposits in the carbs. Either way its best to remove the float bowls and blow out all the jets and drillings. Cillit Bang is fab for cleaning out the gunk but dont leave it on for too long. It's acid and etches the metal.
Whatever you do DONT start fiddling with the air screws. They are unlikely to be the problem and will be a horrible and/or costly job to get put right again.
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Post by covertcodger on Aug 20, 2008 18:45:36 GMT
As it revs freely in neutral, but does not under load. I would be looking at the coil(s).
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Post by sotirisp on Aug 21, 2008 13:11:42 GMT
Darren, i assumed that the petcock filters were intact by saying that's impossible to get carp from the bottom of the tank.
I wasn't intended to make the assumption that you don't know what you say *or* you don't have the experience you have...And i didn't.
P.S. the only time that i got my carbs f***d up was the time i used Redex, thinking that it was going to keep my carbs in a good condition.
Maybe a coincidence but,
since then i'm very skeptical about ANY fuel additives.
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Post by CD on Aug 21, 2008 15:57:36 GMT
Trouble with in-fuel carb cleaners they loosen stuff that then floats around and clogs the jets. Worth the risk if the carbs are clean(ish) to keep them that way. But not on old engines that have never been cleaned or have been stored with old fuel to dry out.
A bit OT -
One of the best ways to clean a diesel fuel system is to run 100% biodiesel for a while. BUT if you dont clean out the fuel tank first, the solvent effects of the methyl ester will soon lift a mat of clag (from the old dino diesel) from the tank bottom. That will be floating around the tank for weeks to come clogging the pipes and fuel filters .
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