antz
CBT failure
Posts: 24
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Post by antz on Apr 10, 2010 6:29:54 GMT
Just a quick one i have just bought my first big bike yamaha xj600 bought it for a good price full service etc and owned by a lady and garaged for the last 5 years, hence why i went for this as i was used to a 125cc and thought not bad bike even tho considered an astra diesal van in the bike world!! but you gotta start some where?..the bike starts just fine but it is hunting does not have a nice balanced tick over plus lots of white smoke when you rev it up and it smells of fuel i.e smoke smells of fuel a bit, there is no creamyness in the oil and no leaks etc around the bike, there is a slight tapping as well, should i be very worried and would it be worth getting the carbs ballenced etc?..all help welcome!!
I have done some video footage of the engine noise to help as well..the link is:
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Post by Flymo on Apr 10, 2010 8:20:30 GMT
Hi Antz, Welcome to the forums and a wealth of knowledge too.
Firstly i'd turn up the tickover a bit, it's supposed to be around 1150 to 1250 RPM, getting the carbs balanced won't hurt and will help reduce the vibes a bit (but they are all vibey anyway)
the rattles could be clutch/oil pump drive pin related, Which they all do anyway there's a few threads about it somewhere, if it's more of a ticking sound might be the cams / tappet / shims might be worth checking them, but noisy tappets arn't always bad, it's when they go quiet that it's more likely to do damage.
i'm sure the more informed members will be along Soon.
Flymo
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Post by Padster on Apr 10, 2010 9:33:28 GMT
Hunting is a sign that the carbs need balancing. White smoke is normally just any water/condensation in the exhausts etc. The bikes are a bit clattery from the starter clutch and sometimes the valve shims or camchain tensioner. The bike doesn't sound too bad. Are then any details with the bike as to when the valve shims were checked?
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antz
CBT failure
Posts: 24
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Post by antz on Apr 10, 2010 11:14:37 GMT
Hi Antz, Welcome to the forums and a wealth of knowledge too. Firstly i'd turn up the tickover a bit, it's supposed to be around 1150 to 1250 RPM, getting the carbs balanced won't hurt and will help reduce the vibes a bit (but they are all vibey anyway) the rattles could be clutch/oil pump drive pin related, Which they all do anyway there's a few threads about it somewhere, if it's more of a ticking sound might be the cams / tappet / shims might be worth checking them, but noisy tappets arn't always bad, it's when they go quiet that it's more likely to do damage. i'm sure the more informed members will be along Soon. Flymo Thanks for the reply ;D |
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antz
CBT failure
Posts: 24
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Post by antz on Apr 10, 2010 11:19:18 GMT
Hunting is a sign that the carbs need balancing. White smoke is normally just any water/condensation in the exhausts etc. The bikes are a bit clattery from the starter clutch and sometimes the valve shims or camchain tensioner. The bike doesn't sound too bad. Are then any details with the bike as to when the valve shims were checked? To be honest there is no reciepts for anything concerning the vavle shims etc...would this be an exspensive job to do?...i have orderd new spark plugs air filter and oil & filter to just so then i no it is all fresh! oh i also bought haynes book to as i have a feeling im going to be using it a lot lol...but from all of that the bike is in good nick and like i said before lady owner for last 5 years with hardly no use from her at all, so fingers crossed! |
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Post by CD on Apr 12, 2010 9:11:04 GMT
Dont worry too much about the top end. Its air cooled so will be more noisy than newer machinery. You need to worry when it goes quiet because thats when the valve clearances have closed up and the valves are burning.
The petrol smell could be sticking choke(s). Use a small mirror to look at the carbs. On each one next to the inlet end you should see sliding plunger. This should lift when you operate the choke lever. Any that dont will need to be cleaned out. IIRC a 14mm open end spanner fits the plunger top.
If you decide to open the carbs use a new Posi screwdriver and DONT allow it to slip. The screws are quite soft. IMHO it would be worthwhile taking off the float covers and blowing out all of the jets and passages. Take out the jets one by one and blow through with a bike pump or compressor if you have one.
I found Cillit Bang does a good cleaning job but brush it on and dont leave it too long - it etches carburettor metal.
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antz
CBT failure
Posts: 24
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Post by antz on Apr 14, 2010 15:36:31 GMT
Dont worry too much about the top end. Its air cooled so will be more noisy than newer machinery. You need to worry when it goes quiet because thats when the valve clearances have closed up and the valves are burning. The petrol smell could be sticking choke(s). Use a small mirror to look at the carbs. On each one next to the inlet end you should see sliding plunger. This should lift when you operate the choke lever. Any that dont will need to be cleaned out. IIRC a 14mm open end spanner fits the plunger top. If you decide to open the carbs use a new Posi screwdriver and DONT allow it to slip. The screws are quite soft. IMHO it would be worthwhile taking off the float covers and blowing out all of the jets and passages. Take out the jets one by one and blow through with a bike pump or compressor if you have one. I found Cillit Bang does a good cleaning job but brush it on and dont leave it too long - it etches carburettor metal. Thankyou very much for your advise mate i will check tomorrow...MOD1 in the morning crapping my self  |
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antz
CBT failure
Posts: 24
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Post by antz on Apr 14, 2010 15:37:27 GMT
Hi Antz, Welcome to the forums and a wealth of knowledge too. Firstly i'd turn up the tickover a bit, it's supposed to be around 1150 to 1250 RPM, getting the carbs balanced won't hurt and will help reduce the vibes a bit (but they are all vibey anyway) the rattles could be clutch/oil pump drive pin related, Which they all do anyway there's a few threads about it somewhere, if it's more of a ticking sound might be the cams / tappet / shims might be worth checking them, but noisy tappets arn't always bad, it's when they go quiet that it's more likely to do damage. i'm sure the more informed members will be along Soon. Flymo How do i turn up the tick over? |
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Post by beeblemaster on Apr 14, 2010 16:54:42 GMT
Hi Antz, Welcome to the forums and a wealth of knowledge too. Firstly i'd turn up the tickover a bit, it's supposed to be around 1150 to 1250 RPM, getting the carbs balanced won't hurt and will help reduce the vibes a bit (but they are all vibey anyway) the rattles could be clutch/oil pump drive pin related, Which they all do anyway there's a few threads about it somewhere, if it's more of a ticking sound might be the cams / tappet / shims might be worth checking them, but noisy tappets arn't always bad, it's when they go quiet that it's more likely to do damage. i'm sure the more informed members will be along Soon. Flymo How do i turn up the tick over? There's a knob you can fiddle with at the centre of the carbs. pointing out towards the back of the bike. Turn it clockwise (by hand) to increase. |
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Post by cam7777 on Apr 14, 2010 17:45:23 GMT
As others have correctly said, turn up the tickover and it should sound a lot better, the clutch basket makes some horrible sounds when the idle is too low.
Sounds sweet enough when revved, I reckon it sounds right.
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antz
CBT failure
Posts: 24
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Post by antz on Apr 17, 2010 19:36:53 GMT
Dont worry too much about the top end. Its air cooled so will be more noisy than newer machinery. You need to worry when it goes quiet because thats when the valve clearances have closed up and the valves are burning. The petrol smell could be sticking choke(s). Use a small mirror to look at the carbs. On each one next to the inlet end you should see sliding plunger. This should lift when you operate the choke lever. Any that dont will need to be cleaned out. IIRC a 14mm open end spanner fits the plunger top. If you decide to open the carbs use a new Posi screwdriver and DONT allow it to slip. The screws are quite soft. IMHO it would be worthwhile taking off the float covers and blowing out all of the jets and passages. Take out the jets one by one and blow through with a bike pump or compressor if you have one. I found Cillit Bang does a good cleaning job but brush it on and dont leave it too long - it etches carburettor metal. Right then i have turned up the tick over and the engine seems to run better, and i have given her a service, i.e: New irdium spark plugs New shell fully syn oil New K&N oil filter New K&N air filter and it is not kicking out so much white smoke as before, but it is still kicking out white smoke when it warms up?...not huge amounts but enufff to think hmmmm!!!...i have also noticed when you rev it up quickly the revs seem to take a few secs to come down?...the throttle control is quick and responsive so it's not the cable etc....im asuming now i must get the carbs balanced?..oh by the way when i took the old spark plugs out they were black, im asuming this is due to wrong air and fuel mixture?...well this is what i have read and seen in the haynes book of bullsh*t...but im very new to all of this so what do i no?..<blank stare>  |
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Post by CD on Apr 22, 2010 19:09:20 GMT
Black plugs can just mean they were not working properly. You wont know for sure until its been out for a proper run. Dont fiddle with any of the carb screws 100:1 they are perfect as they are.
Search the forum** for setting the Throttle Position Sensor (TPS) that can make the plugs a bit dark.
Dont forget to check those chokes and the air filter. If the exhaust smells like - erm exhaust its fine. If it smells sulphury/oily then it could be burning oil. But these engine go for ever so its unlikely.
** Go to the bottom and set the search for 2 years or it wont find much
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antz
CBT failure
Posts: 24
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Post by antz on Apr 30, 2010 13:19:37 GMT
Black plugs can just mean they were not working properly. You wont know for sure until its been out for a proper run. Dont fiddle with any of the carb screws 100:1 they are perfect as they are. Search the forum** for setting the Throttle Position Sensor (TPS) that can make the plugs a bit dark. Dont forget to check those chokes and the air filter. If the exhaust smells like - erm exhaust its fine. If it smells sulphury/oily then it could be burning oil. But these engine go for ever so its unlikely. ** Go to the bottom and set the search for 2 years or it wont find much Thanks for all the help |
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Post by liam hicks on May 10, 2010 13:29:52 GMT
Whats that guage where the oil filler cap should be. is it oil pressure?
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Post by CD on May 10, 2010 21:02:15 GMT
Not a clue unless its an after-market temperature gauge.
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Post by Jake on May 28, 2010 0:09:41 GMT
Nice bike matey, is it any better now with the idle turned up?
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Post by tyer0667 on May 28, 2010 14:25:29 GMT
looking at your video, your tickover is way too low, it should be roughly 1200 rpm to 1250 on idle, mine is the same when it is low on tickover, sounds rough but when it stays at 1250 it sounds sweet
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