1999 M600 has been sitting for 5 years - what to do?

jamminbmx · 24-05-2022, 06:22 AM

OK...Update time. The monster has been great after you lot helped me patch it back up!

But now I have fiddled with something and it is not great.

I replaced the fuel line from tank to filter and from filter to fuel tap. I could not get an L-shaped filter so used a normal straight filter.

The fuel lines are quite long so they have smooth curves. Also took the tank off.

Now it runs but is down on power. Feels like fuel starvation!! I ran it with the tank cap open and this made no difference. It won't go more than 60mph and this takes some serious run up

Any ideas?! Can I run a line direct from tank via a filter to the carbs to rule out fuel pump or tap?

Any help would be much appreciated! Supposed to go riding at the weekend!

Dukedesmo · 24-05-2022, 10:50 AM

Quote:

Originally Posted by jamminbmx

Now it runs but is down on power. Feels like fuel starvation!! I ran it with the tank cap open and this made no difference. It won't go more than 60mph and this takes some serious run up

Silly as it sounds, are you sure both cylinders are firing?

Asking because on my M900, the connector fell off the wire from the ignition module to one of the coils and the bike, unsurprisingly, suddenly lost power and couldn't do more than about 60mph but, oddly it sounded and felt like it was running fine despite the front cylinder not firing at all, it even idled OK.

jamminbmx · 24-05-2022, 11:21 AM

Dukedesmo - I was kind of wondering that but assumed it would run really badly. Both cylinders felt hot though...is there a better way to check?

I could have easily knocked a connector off with the repeated opening and closing of the tank.

It does feel exactly like normal...but with half the power

Mr Gazza · 24-05-2022, 12:09 PM

If you get a third degree burn when you touch the pipe, then it's firing on that one.
A slightly safer way is to spit on your finger and dab it on quickly. If it crackles and fizzes then you know it's hot.

The other things that it's possible to displace when pulling and tugging in there are the vacuum lines to the tap and pump, however I'm not sure it would run at all if one was not connected?
Worth a check though, they run down to the carb manifolds.

24-05-2022, 06:22 AM	#1
jamminbmx Registered User Join Date: Mar 2016 Location: oxford Bike: M600 Posts: 131	Fuel problems! OK...Update time. The monster has been great after you lot helped me patch it back up! But now I have fiddled with something and it is not great. I replaced the fuel line from tank to filter and from filter to fuel tap. I could not get an L-shaped filter so used a normal straight filter. The fuel lines are quite long so they have smooth curves. Also took the tank off. Now it runs but is down on power. Feels like fuel starvation!! I ran it with the tank cap open and this made no difference. It won't go more than 60mph and this takes some serious run up Any ideas?! Can I run a line direct from tank via a filter to the carbs to rule out fuel pump or tap? Any help would be much appreciated! Supposed to go riding at the weekend!

24-05-2022, 11:21 AM	#3
jamminbmx Registered User Join Date: Mar 2016 Location: oxford Bike: M600 Posts: 131	Dukedesmo - I was kind of wondering that but assumed it would run really badly. Both cylinders felt hot though...is there a better way to check? I could have easily knocked a connector off with the repeated opening and closing of the tank. It does feel exactly like normal...but with half the power Last edited by jamminbmx; 24-05-2022 at 11:31 AM..

24-05-2022, 12:09 PM	#4
Mr Gazza Lord of the Rings Join Date: May 2013 Location: Norwich Bike: M900sie Posts: 5,849	If you get a third degree burn when you touch the pipe, then it's firing on that one. A slightly safer way is to spit on your finger and dab it on quickly. If it crackles and fizzes then you know it's hot. The other things that it's possible to displace when pulling and tugging in there are the vacuum lines to the tap and pump, however I'm not sure it would run at all if one was not connected? Worth a check though, they run down to the carb manifolds. __________________