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Hi Folks
The purge valve on theoffside rear of the engine is giving me some problems. It has 3 pipes connected,one large pipe to the cannister on the offside of the bike above the brake pedal. The two small pipes go to the carbs and to the vacuum advance. When the engine is revved slowly increasing the revs past 3000 the system coughs splutters and dies, only continuing to full throttle opening will make thebike rev. So we have a vacuum advance problem , if I fit a vaccumgauge to the T piece by theignition unitI canconfirm the totalloss of vacuum at 3000 revs. Now for the bit I dont understand if I remove the large pipe from the purge valve the Bike runs perfectly. Vacuum gauge confirms normal ignition advance.
There appears to be no pressure or vacuum build up in the large pipe which is effectively just a fuel fume venting system. I could replace the purge valve but could just leave the pipe disconnected and to hell with the environment.....
any ideas?
Thanks
Hi Folks
The purge valve on theoffside rear of the engine is giving me some problems. It has 3 pipes connected,one large pipe to the cannister on the offside of the bike above the brake pedal. The two small pipes go to the carbs and to the vacuum advance. When the engine is revved slowly increasing the revs past 3000 the system coughs splutters and dies, only continuing to full throttle opening will make thebike rev. So we have a vacuum advance problem , if I fit a vaccumgauge to the T piece by theignition unitI canconfirm the totalloss of vacuum at 3000 revs. Now for the bit I dont understand if I remove the large pipe from the purge valve the Bike runs perfectly. Vacuum gauge confirms normal ignition advance.
There appears to be no pressure or vacuum build up in the large pipe which is effectively just a fuel fume venting system. I could replace the purge valve but could just leave the pipe disconnected and to hell with the environment.....
any ideas?
Thanks