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Discussion Starter #1
Have a good friend who has just bought the above, and its running like a pig,real lumpy first thing in the morning, wont start without a lot of crankin with some smoke at start. The bike has some 31000 miles on it and looks good. The carbs have been balanced with new plugs but on tick over it revs badly up and down. When warm its tickin over at the 1k range but its up and down by 500 ish.

Any help plz
 

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Have a good friend who has just bought the above, and its running like a pig,real lumpy first thing in the morning, wont start without a lot of crankin with some smoke at start. The bike has some 31000 miles on it and looks good. The carbs have been balanced with new plugs but on tick over it revs badly up and down. When warm its tickin over at the 1k range but its up and down by 500 ish.

Any help plz

Air leaks perhaps?
Try spraying WD40 around the intake manifolds and listen for the idle to drop as it sucks the fluid through any gaps. Check all the vacuum lines are good and correctly connected. Don't forget to check the vacuum ports for balancing are capped.
Has he replaced the fuel filter?
 

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Discussion Starter #4
Got the idle sorted, the guy who did the carb balance put new plugs in it without setting them up !
Next we took the bike out for a real good spin "200 miles" as he is backing off the gas a smoke screen appeared behind him. So we put just over a ltr of oil in the bike ! So it covered 300 miles on a ltr of oil.

Its got 32000 miles on it with no history but it sounds ok !

Anyone got any thoughts ? valve stem seal and rings ?

Cheers
 

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Got the idle sorted, the guy who did the carb balance put new plugs in it without setting them up !
Next we took the bike out for a real good spin "200 miles" as he is backing off the gas a smoke screen appeared behind him. So we put just over a ltr of oil in the bike ! So it covered 300 miles on a ltr of oil.

Its got 32000 miles on it with no history but it sounds ok !

Anyone got any thoughts ? valve stem seal and rings ?

Cheers

Sounds like valve guide seals.
Do wet and dry compression test and leakdown test but I reckon it's seals. It could also be a head gasket though.
Any of the plugs showing oil burning?
 

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Discussion Starter #6
Strange but the plugs all look good now ! It smokes from both pipes. Before i did the plugs they where black but now they look good.
 

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Discussion Starter #7
It just gets better !
The bike was suffering with a slight oil leak after the service that was done. So popped her apart and low and behold the new oil filter was leaking but with the smell of burnt oil check the water level !

So now the bike was burning oil and had no water in her at all ! massive water leak which had never been checked ! So she has been cooling herself down by burning oil.
The old owner had removed the stat which of course has caused more issues.

The next issue was having left the owner with new coolant in the bike and burnt oil i advised him to change the oil which he did ! New oil with old oil sump plug and ring causing oil leak ! So the plonker cranked the plug up so tight he cracked the sump.

I think the moral of the story is get something with a service history is well worth it, if not get someone with some sort of idea to check the bike throughout.
 

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It just gets better !
The bike was suffering with a slight oil leak after the service that was done. So popped her apart and low and behold the new oil filter was leaking but with the smell of burnt oil check the water level !

So now the bike was burning oil and had no water in her at all ! massive water leak which had never been checked ! So she has been cooling herself down by burning oil.
The old owner had removed the stat which of course has caused more issues.

The next issue was having left the owner with new coolant in the bike and burnt oil i advised him to change the oil which he did ! New oil with old oil sump plug and ring causing oil leak ! So the plonker cranked the plug up so tight he cracked the sump.

I think the moral of the story is get something with a service history is well worth it, if not get someone with some sort of idea to check the bike throughout.

If it's had no coolant in it at all then the temperature gauge will have been showing fairly normal while the engine was cooking. The temperature sender needs to be immersed to be accurate.
There's a good chance it's blown a head gasket or warped a head. Keep an eye on the level of coolant (not water) on the radiator and if it is using it you'll need to do a compression test.
You should be able to weld the sump up and re-tap the thread but it may be easier to replace it.
 
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