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I have recently bought a 2001 Falco. It has Sl cans and chip. It ran like a bag of sh1t on way back then cleared and ran fine for 3 days. Then the clutch went on a 70 mile journey, leaking seal, air in line.

Then it wouldn't start and when it eventual did would not idle and intermittently lost power.

Happily I have sorted the clutch.

I have checked plugs, gapped and cleaned them, charged the battery, and the bike starts fine and idles well. However, I have very little power, I managed the sum of 75mph this morning and it would go no faster.

Idles perfectly but just no power.

Any suggestions welcome.

by chance, was the bike stood for a while?

if so, try some redex or similar - also consider contaminated fuel..... check the drains on the outer tank surround in case you have water swilling around there

check and clean the air filter

ensure that all the HT leads and coil connecters are snug

is there an alarm fitted?

check the right hand engine off switch - clean it as needed....

Thanks, lead were checked yesterday, I'm on third tank of fuel, having run down to reserve both times before filling. Switch is fine. The engine runs evenly, just poor acceleration and no top end.

Hmm only 75 - well that's not right.

When it's running, is it actually running on both cylinders?
occasionally when mine has been badly in need of servicing it has chosen to run on one and is very much down on power (for obvious reasons).

If that is the case then we need to start to investigate why .....

If not electrical then I would try redex..... And I would empty the tank totally and look at the fuel filter.... Running it to reserve will still leave sludge there....

Thanks, I will check that out tomorrow. If it's running on one cylinder it's doing well.

They do.... Trust me, when I had a wired electrical gremlin I found out.....

Make sure the petrol pipe hasn't been crushed and replace the filter if there is one. Sounds like fuel starvation over electrical to me.

May be worth checking the vacuum pipes, a leak there can give similar problems,also try 2 new plugs,even if you are getting a big fat spark with the plug out, if they're getting tired they can fail to spark under load (fitted ).
Falco has 4 plugs,try the lower ones,would be odd for all of em to die at same time

Since the clutch has been played with, check the slipper tube and valve and pull the cover off and check the diaphragm for holes.

Look for other leaky vacuum hoses.

Does sound like fuel starvation though.

Air filter clean?

Check the butterfly's are tight too.

Hi all,

Check your vacuum pipe on the TB's, mine was loose, looked ok, till I wiggled it Got some super stuff and cleaned and sealed it. Now like a scalded cat with new boots on

Right, at last got some time on it again.

Narrowing problem down. Rear cylinder is cold, so clear not running. plugs are sparking on that cylinder and are wet with fuel so I am a little puzzled.

Any suggestions guys.

I am changing plugs just in case they are not up to load.

Well it was that simple - new plugs all round - solved.

And if any one dare say you should have checked your toolkit for a special plug spanner to get to the front plugs, before destroying your knuckles, i will scream.

Did you check your toolkit for a special plug spanner ??
It could save your knuckles from a right scraping.

TEEHEE

lol