Ok guys, i nearly have my mk1 2 door to a stage that i am happy with. Its on the road and driving at least.
The car has a 2.0 built by the previous owner so i dont know cr or camshaft selection. I had a new set of twin 45 added and a dyno tune completed. I dont put much faith in dynos but apparently it came up at 120rwhp.
It was great for a small while, idles and starts beatifully, still does.
Now when i try and excelerate through the rev range it sort of dies at 4750 upwards.
Previously i was reving to 6.
Prior work was done by a mechanic
Ive spent enough on the car for the time being so i was hoping with a little help i could have a crack at this new issue myself.

I'll suggest the carbs could be out of balance or have a blockage in a fuel gallery/jet , Webers are temperamental with dirt in them. Also check cam timing as the belt could have jumped a tooth. .. rare but does happen.

Big carbs for an engine only revving to 6?
 
What sort of ignition you got?  Electronic or points?

Check for water in the carby fuel bowls.
Dodgy ignition leads or connections?
Is the misfire only under load in higher gears & wide throttle or also revving in lower gears & light throttle?
SFE
 

Blocked/restricted fuel filter.
 
 
 
 

Thanks for the responses guys.
Have a look at these photos and let me know what you think.
The distributor looks a bit nasty?
Could the filters be causing a restriction?

Fuel filter looks ok

Mk1oz what would you expect a decent pinto to make max hp.
I have been babying the car as i have only driven it a dozen or so times.

Im not sure im keen on pulling the webbers apart after a tune.

Sfe ill take it for a spin on the weekend and report. I doubt it has water anywhere in the system as its not been driven in the rain.

What, explain what is happening above 4750. Does it just not accelerate as hard or starts to run rough. Does it only happen At full throttle

It will still a excelarate through and past the 4750 mark.
There is just a distinct and definate point at which the rate at which the revs rise slows dramaticaly.
The power dies of dramatically as well.
You have me scratching my head but i think it only happens in a full throttle situation. I cant recall it happening under light throttle but i didnt specifically try it either.
Ill warm it up and give it a light rev tonight.

Filter socks often get sucked into the trumpets.
I found this on the dyno with 40mm sidedraught webers - even with springs inside the socks.
Changed to K&N pleated filters. This was with only 95 rwhp too.
 
 
Cheers

If your running an old mechanical advance dizzy you might want to check that, if the weights are stopping at that point it will still run but wont run well