Larry Langford
Registered user
,,also the air breather could be clogged up .... might be a big rats nest in there .....
Probably best if you read my previous posts, before you post advice.
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Probably best if you learn how to fix your own motorcycles if you need to ask advice on an internet forum,then post sarky comments to folk that might actually know what they’re doing.
Just saying,,,,like
As you said it’s not brain surgery.
These things take time, and right now I am still going through the bike.
If you don’t like me asking for advice or trying to build a thread, detailing my experience as I learn about a new bike, you could always say nothing.
The R90S is starting easily, running, idling and no longer misfiring! 
I ended up ultrasonically cleaning and rebuilding both carburettors and resetting the points gap (it was way less than 0.4mm). I then spent a bit of time finding idle - it's now idling at just under 950rpm and with the idle mix set to 1 turn out. If I wind the throttle stop screws out any further, it cuts out.
Additionally I checked and adjusted the valve clearances, dropped the sump, replaced the oil and air filters, fresh oil, lubed up the shaft on the on the starter Bendix, cleaned up a load of grubby bits and then put it back together.
Next on the list is to borrow a carb balancer device, test ride the bike and fit new tyres (current ones are 10 years old).
Question: Is it normal to hear a little bit of valve chatter when the bike is idling?
Other question: There is a little intermittent popping under gentle throttle when stood, the rpm blips slightly at the same time. Is this likely to be the carb setup?
I ended up ultrasonically cleaning and rebuilding both carburettors and resetting the points gap (it was way less than 0.4mm). I then spent a bit of time finding idle - it's now idling at just under 950rpm and with the idle mix set to 1 turn out. If I wind the throttle stop screws out any further, it cuts out.
Additionally I checked and adjusted the valve clearances, dropped the sump, replaced the oil and air filters, fresh oil, lubed up the shaft on the on the starter Bendix, cleaned up a load of grubby bits and then put it back together.
Next on the list is to borrow a carb balancer device, test ride the bike and fit new tyres (current ones are 10 years old).
Question: Is it normal to hear a little bit of valve chatter when the bike is idling?
Other question: There is a little intermittent popping under gentle throttle when stood, the rpm blips slightly at the same time. Is this likely to be the carb setup?
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Valves are noisy.
Check intake rubbers for cracking ( look inside them as well ).
Check intake rubbers for cracking ( look inside them as well ).
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