Poorly Lammy
Posted: Sun Feb 17, 2019 5:15 pm
Hi, hoping for some help here.
So, I have a 1959 Series 2 Lammy, stage 4 175 conversion, 12 volt electronic ignition, standard Dellorto SH1/2 carb with standard jets.
It's been running OK, starting OK, idling OK.
Out for a run yesterday, bimble through town OK, then out on the open road running at 45-50mph on about ¾ throttle. All is good.
After about 4-5 miles, it starts showing signs of loosing power; ie, slowing down, engine note reducing, not responding to the throttle.
Having had the piston nip up in the distant past, I think perhaps it could be doing it again, so I close the throttle and pull the clutch in. The engine immediately goes to full revs with the throttle still closed. The only way to bring the revs down is to release the clutch. I can eventually get the revs back to idle with the throttle closed.
Playing with the throttle for a while seems to bring things back to normal so I carry on. I should of turned for home.
A few miles further on things become worse and eventually come to a stop.
Thinking dirt in the fuel, I strip the jets out, give them a good blow, all looks good and put them back. It now won't start and I end up getting recovery to get back home.
Does anyone have any idea what's going on?? I mean how do you get full revs with a closed throttle? The throttle cable and slide operates normally, no signs of sticking open.
Thanks.
So, I have a 1959 Series 2 Lammy, stage 4 175 conversion, 12 volt electronic ignition, standard Dellorto SH1/2 carb with standard jets.
It's been running OK, starting OK, idling OK.
Out for a run yesterday, bimble through town OK, then out on the open road running at 45-50mph on about ¾ throttle. All is good.
After about 4-5 miles, it starts showing signs of loosing power; ie, slowing down, engine note reducing, not responding to the throttle.
Having had the piston nip up in the distant past, I think perhaps it could be doing it again, so I close the throttle and pull the clutch in. The engine immediately goes to full revs with the throttle still closed. The only way to bring the revs down is to release the clutch. I can eventually get the revs back to idle with the throttle closed.
Playing with the throttle for a while seems to bring things back to normal so I carry on. I should of turned for home.
A few miles further on things become worse and eventually come to a stop.
Thinking dirt in the fuel, I strip the jets out, give them a good blow, all looks good and put them back. It now won't start and I end up getting recovery to get back home.
Does anyone have any idea what's going on?? I mean how do you get full revs with a closed throttle? The throttle cable and slide operates normally, no signs of sticking open.
Thanks.