Olly
XS650 Member
Hi,
I have been reading xs650.com for a while, great forum, but this is my first post. I have an '81 XS650 engine in my Wasp sidecar outfit, and have just replaced the stock carbs with a single Mikuni VM36 and a 2-into-1 manifold.
The engine runs nicely at idle and at 1/2 to full throttle. The problem is that if I gently rev it (1/4 to 1/2 throttle) the engine revs high and stays at high revs even after closing the throttle. The revs only drop after a quick blip of the throttle, and then it returns to a nice steady tick over.
I think I've got the jetting about right, and it has got a good throttle return spring, and a new cable so definitely not sticking.
What else could be causing this?
I have been reading xs650.com for a while, great forum, but this is my first post. I have an '81 XS650 engine in my Wasp sidecar outfit, and have just replaced the stock carbs with a single Mikuni VM36 and a 2-into-1 manifold.
The engine runs nicely at idle and at 1/2 to full throttle. The problem is that if I gently rev it (1/4 to 1/2 throttle) the engine revs high and stays at high revs even after closing the throttle. The revs only drop after a quick blip of the throttle, and then it returns to a nice steady tick over.
I think I've got the jetting about right, and it has got a good throttle return spring, and a new cable so definitely not sticking.
What else could be causing this?