standard cvh yes can only pull away after a few mins once warm i drive it like it everyday if i plug everything as it should be and drive it down the road hard its ok at about 4 to 5 thousand revs clears out then when i change gear misses again but ticks over fine cant rev it up then but if i lean the mixture up starts to rev ok till all the fuel in metering head is gone then stalls and needs to be riched up to start again then problems all over again so drive with metering head plug off so its powerless was fine till i had engine out put back in then was never right since only done rings and shells didnt disturb anthing else