Couple of questions...

[Cammo]

Some investigation is warranted then. Out of interest, what would be your feeling if it was drinking all the fuel in the bowls and stalling and what would be your view if it wasn't?

It could be due to number of things:

Fuel needs to get to the carbs (check fuel tap operation), fuel needs to get to the bowls (check float needle valves), fuel needs to fill up bowls (check float height, float condition [holes]), lastly fuel needs to get burnt in the cylinder at idle (check pilot screw settings, plug condition, and possibly haynes charging system checks).

A process of elimination should sort it out, it's just a bunch of moving parts!

[DoktorMandrake]

Some investigation is warranted then. Out of interest, what would be your feeling if it was drinking all the fuel in the bowls and stalling and what would be your view if it wasn't?

It could be due to number of things:

Fuel needs to get to the carbs (check fuel tap operation), fuel needs to get to the bowls (check float needle valves), fuel needs to fill up bowls (check float height, float condition [holes]), lastly fuel needs to get burnt in the cylinder at idle (check pilot screw settings, plug condition, and possibly haynes charging system checks).

A process of elimination should sort it out, it's just a bunch of moving parts!

Cheers Data!


So we have fuel getting to the carbs. The tap works as does the vacuum feed.

How does one check the needle valves? I hate setting float heights. I can never get the blasted thing at the right angle. Any tips? Also, how do you check the needle valves?

How'd you check float condition [holes]? As in there should be holes in the float or as in if tehre is holes in the float we got problems?

Plugs should be good, pilot screws are set at 2 or 2.25 turns out.

It deffo seems an idling prob. Without getting her on a dyno to check, she seems to be running fine.

Could perished inlet rubbers cause a problem?


AAAAARGH... I HATE TAKING THE CARBS OFF!!!

Well getting them back on. I love the V4, but give me a il4 any day for ease of carb refitting.

[ilyamo-morte]

I seem to be developing a similar problem. fuel is def flowing to carb ok but bike is dying after a few secs. Cleaned emulsion tubes, pilot jets. replaced main jets, all the usual. float levels where ok but symptoms def suggest float valves are staying closed. gonna check float levels again before stripping down carbs. Did you manage to get to the root your problem?