Question about 1981 Moto Guzzi 850 T 3 California

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Why is there a lag when I open up the throtle?

The 850 Guzzi has a lag in the throttle when it is opened up. It seems to wallow for a few seconds before the speed increases. I have pod filters

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AB268 jets. Ele ignition. The timing seems Ok. It idles Ok.In fact it goes really well but there is this first few seconds it wallows really annoying when you need to get away fast... I have played around with the pumpers on the carbs to see if it makes any difference but it's still thereThe original slides in your PHFs carbs are type 60/3 which means the height of the cutaway is 6 mm (the 3 refers to the shape of the ramp for the operation of the accel. pump). By changing to 50/* slides you richen-up the operation JUST OFF idle i.e. in order to avoid the 'stumbling' of the engine JUST as you open the throttle. Slides are expensive and 50/* may be an overkill(?) so the common advice is to shave off half a millimetre of the bottom of the slide, thus making it a 55 slide. Haven't been brave enough to do this on my own LM3, but after I got rid of the boat-anchor-flywheel the problem is now possible to live with. Go Captain Karl H's way first and see for yourself, it's like getting a new bike!! I would not not have bothered fiddling with the accel.pumps to solve this problem: by the time these water guns squirt raw juice into the barrels you're well on the way driving anyway. I've even disconnected the pumps and I haven't seen any adverse effect of that. ,,,

Posted on Nov 10, 2008

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SOURCE: Why is there a lag when I open up the throtle?

AB268 jets. Ele ignition. The timing seems Ok. It idles Ok.In fact it goes really well but there is this first few seconds it wallows really annoying when you need to get away fast... I have played around with the pumpers on the carbs to see if it makes any difference but it's still thereThe original slides in your PHFs carbs are type 60/3 which means the height of the cutaway is 6 mm (the 3 refers to the shape of the ramp for the operation of the accel. pump). By changing to 50/* slides you richen-up the operation JUST OFF idle i.e. in order to avoid the 'stumbling' of the engine JUST as you open the throttle. Slides are expensive and 50/* may be an overkill(?) so the common advice is to shave off half a millimetre of the bottom of the slide, thus making it a 55 slide. Haven't been brave enough to do this on my own LM3, but after I got rid of the boat-anchor-flywheel the problem is now possible to live with. Go Captain Karl H's way first and see for yourself, it's like getting a new bike!! I would not not have bothered fiddling with the accel.pumps to solve this problem: by the time these water guns squirt raw juice into the barrels you're well on the way driving anyway. I've even disconnected the pumps and I haven't seen any adverse effect of that. ,,,

Posted on Nov 10, 2008

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Why is there a lag when I open up the throtle?


AB268 jets. Ele ignition. The timing seems Ok. It idles Ok.In fact it goes really well but there is this first few seconds it wallows really annoying when you need to get away fast... I have played around with the pumpers on the carbs to see if it makes any difference but it's still thereThe original slides in your PHFs carbs are type 60/3 which means the height of the cutaway is 6 mm (the 3 refers to the shape of the ramp for the operation of the accel. pump). By changing to 50/* slides you richen-up the operation JUST OFF idle i.e. in order to avoid the 'stumbling' of the engine JUST as you open the throttle. Slides are expensive and 50/* may be an overkill(?) so the common advice is to shave off half a millimetre of the bottom of the slide, thus making it a 55 slide. Haven't been brave enough to do this on my own LM3, but after I got rid of the boat-anchor-flywheel the problem is now possible to live with. Go Captain Karl H's way first and see for yourself, it's like getting a new bike!! I would not not have bothered fiddling with the accel.pumps to solve this problem: by the time these water guns squirt raw juice into the barrels you're well on the way driving anyway. I've even disconnected the pumps and I haven't seen any adverse effect of that. ,,,

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