Hi,
A few weeks ago I posted a thread relating to a problem with throttle response on my CB200 when the engine got up to operating temperature. The engine ran great from cold, good idle and good throttle response from idle up to high revs then as soon as the motor warmed up the response from idle deteriorated drastically misfiring badly until it reaches the 4000 rev line then it revs freely. I decided to replace the O-Rings in the carb insulators with gaskets in case of air leaks which made no difference. Then I thought I'd solved the problem. I decided the air filters were looking a bit grubby so just as a matter of interest I ran the engine with no filters and low and behold she ran great. I refurbished the filters by removing the old paper filter and replaced it with a foam element as described on a previous thread and yes you've guessed it back to the same problem. I checked the plugs again and yet again they are a sooty black indicating an over-rich mixture.
The carbs have been cleaned several times in a sonic cleaner as have all the jets. I replaced the condenser with a new one. I have re-torqued the head bolts as the engine has had a rebuild. Points checked and timed up as described in the manual but the problem still rears it's head when she warms up.
I rode her up the local by-pass yesterday and she just hit 65mph but that was it then power seemed to fade until I was lucky to get 50 mph out of her. I'm at a total loss and my brain hurts. I don't even know how she ran before I got her as she was in a box of bits.
Many Regards,
Glyn.
A few weeks ago I posted a thread relating to a problem with throttle response on my CB200 when the engine got up to operating temperature. The engine ran great from cold, good idle and good throttle response from idle up to high revs then as soon as the motor warmed up the response from idle deteriorated drastically misfiring badly until it reaches the 4000 rev line then it revs freely. I decided to replace the O-Rings in the carb insulators with gaskets in case of air leaks which made no difference. Then I thought I'd solved the problem. I decided the air filters were looking a bit grubby so just as a matter of interest I ran the engine with no filters and low and behold she ran great. I refurbished the filters by removing the old paper filter and replaced it with a foam element as described on a previous thread and yes you've guessed it back to the same problem. I checked the plugs again and yet again they are a sooty black indicating an over-rich mixture.
The carbs have been cleaned several times in a sonic cleaner as have all the jets. I replaced the condenser with a new one. I have re-torqued the head bolts as the engine has had a rebuild. Points checked and timed up as described in the manual but the problem still rears it's head when she warms up.
I rode her up the local by-pass yesterday and she just hit 65mph but that was it then power seemed to fade until I was lucky to get 50 mph out of her. I'm at a total loss and my brain hurts. I don't even know how she ran before I got her as she was in a box of bits.
Many Regards,
Glyn.
