help ! clipper runs perfect for half hour then aaargh

after the welcome help i got on this site recently regarding hood thought id try again . my 92 clipper wasnt ticking over right spark lead damaged just fitted new plugs & all leads ticking over mint pulling mint drives mint for about half an hour then idles fine when you accelerate its like a kangaroo she wants to go but just chugs let it cool down for 20 mins runs fine again half hour later chug chug help ! need to fix her to come to meet on 18th

I'm no expert but it sounds like dodgy gunk in the fuel if you ask me. Did you let it run low on fuel recently? If so it could bin clogging the fuel filter.

Tian

never let fuel go below quarter . filter looks fine

did you sort it out? i got the same problem

no air filter on at min !!! spoke to volkswagon due to petrol freezing in carb now cold wheather ??? fitting new air filter and housing at weekend let you know if there right or not

fitted new air filter & housing shes fixed !! looks like volkswagon were right

Yep, carb icing.  

I had the same on my clipper.

2 checks,

One to make sure the flap inside the filter housing stays open.

A 'Feature' of the carb engines means the flap should stay closed to draw warm air from the manifold up to about 35 degrees (Not even our summers are that good!)

There is a vacuum valve inside the duct that should lift it, but over the years, that gets tired and flops.

Cold air is bad, so a quick fix is to screw the flap shut from the underneath. I did this and never had problems again.

Another one to watch which all of us carb guys know, is to make sure the convoluted hose (The flexy one) had no holes or splits in and is attached securely to the manifold bracket.  This is to get as much warm air as possible.

Never fear cold again!

Might be carb icing but if it was you wouldn't need 20 min on a hot engine for it to go away?

Still possible you have or had a rotten fuel filler and a tank full or water and muck :dontknow:

hi, i checked the fuel tank and the fuel lines, the tank looks new with no muck at all. The fuel that cam out of the fuel lines was totally clean!

sorry wrong post

thought she was fixed !! brand spanking new air filter , housing & all pipes as there was none at all adjusted carb she ran for about 5o miles no probs now chugging again ok if run with full choke on  new fuel filter next week aaarrgh

think ive had similar problem to you, seem to have fixed mine for 100 miles, cleaned my oil breather pipe as it was filled with gunk.

worth a go. At the same time, i bypassed the fuel reservoir seperator for 5 miles then plugged back into it again so could have been that too.