Post by wayne on Feb 17, 2013 22:31:32 GMT -5
The short story: If you've got problems with the carby, get an ultrasonic cleaner and do a thorough job on it.
I followed Bill's lead (ap951), borrowed an Ultrasonic cleaner and thoroughly cleaned my carb.
My bike doesn't hesitate but it had an idle problem that started for no apparent reason a year ago.
This is the best my bike has run. It will idle with the tacho floating between 8 and 900 rpm (NEVER ever before). Riding the bike feels like it has a single throat carby.
The Long:
Jess has always said this. But I somehow thought an ordinary bloke could never replicate it. I figured that Jess had the experience and magic touch. But Bill's success inspired me.
The carb was cleaned manually in kerosene to remove external crud. Then ultrasonically in WD40 spending over 3 hours in the cleaner as it was rotated through all 6 "faces".
This carb was dismantled and cleaned about 1000 miles ago by conventional methods so it was a pretty clean unit. Despite this, I clogged 4 paper coffee filters straining my WD40 back into its container due to the fine crud that the ultrasonic got out of the carby.
The idle problem and associated symptoms that appeared a year ago have gone (the bike would require full choke to be left on until at least the temp gauge passed the first mark. Any attempt to release to half choke and she'd quit. This was completely different to its usual behaviour where you could go to half choke immediately after start). After the problem appeared, it would take 15 minutes of riding before the bike would no longer stall when at idle. A complete pain trying to ride out of the burbs.
Now she'll start and immediately run on half choke. Choke can be removed completely within a minute.
The whole idle problem pointed to a blockage and lean running but I couldn't clear it using carb dip, compressed air, copper wire in the jets and bleed holes etc.
While the bike doesn't hesitate, you are often aware that she's transitioned from one throat to the next, mainly due to an added surge in acceleration. Now it feels like a single throat carby and just like Steve Thompson's "World's Best Re5". I wondered at his bike on dyno day when I started it and observed it happily ticking away at 900 rpm off choke.
This whole exercise combined with the latest techniques for setting the PV etc gives me hope that I can increase my score of 2/3 to 3/3 and expand it to 2 more bikes that are "in my care".
I also have the gut feeling, given the bike is running so nicely, that PV settings are probably only really critical when the carb is not at its best anyway. I wouldn't be surprised if the PV settings have a lot of lattitude if the carb is thorougly clean and correctly configured (something RR has also been telling me for a long time).
I followed Bill's lead (ap951), borrowed an Ultrasonic cleaner and thoroughly cleaned my carb.
My bike doesn't hesitate but it had an idle problem that started for no apparent reason a year ago.
This is the best my bike has run. It will idle with the tacho floating between 8 and 900 rpm (NEVER ever before). Riding the bike feels like it has a single throat carby.
The Long:
Jess has always said this. But I somehow thought an ordinary bloke could never replicate it. I figured that Jess had the experience and magic touch. But Bill's success inspired me.
The carb was cleaned manually in kerosene to remove external crud. Then ultrasonically in WD40 spending over 3 hours in the cleaner as it was rotated through all 6 "faces".
This carb was dismantled and cleaned about 1000 miles ago by conventional methods so it was a pretty clean unit. Despite this, I clogged 4 paper coffee filters straining my WD40 back into its container due to the fine crud that the ultrasonic got out of the carby.
The idle problem and associated symptoms that appeared a year ago have gone (the bike would require full choke to be left on until at least the temp gauge passed the first mark. Any attempt to release to half choke and she'd quit. This was completely different to its usual behaviour where you could go to half choke immediately after start). After the problem appeared, it would take 15 minutes of riding before the bike would no longer stall when at idle. A complete pain trying to ride out of the burbs.
Now she'll start and immediately run on half choke. Choke can be removed completely within a minute.
The whole idle problem pointed to a blockage and lean running but I couldn't clear it using carb dip, compressed air, copper wire in the jets and bleed holes etc.
While the bike doesn't hesitate, you are often aware that she's transitioned from one throat to the next, mainly due to an added surge in acceleration. Now it feels like a single throat carby and just like Steve Thompson's "World's Best Re5". I wondered at his bike on dyno day when I started it and observed it happily ticking away at 900 rpm off choke.
This whole exercise combined with the latest techniques for setting the PV etc gives me hope that I can increase my score of 2/3 to 3/3 and expand it to 2 more bikes that are "in my care".
I also have the gut feeling, given the bike is running so nicely, that PV settings are probably only really critical when the carb is not at its best anyway. I wouldn't be surprised if the PV settings have a lot of lattitude if the carb is thorougly clean and correctly configured (something RR has also been telling me for a long time).
