WHOA!, don’t give up yet, you’ve made great progress. This is an unknown motor that the previous owner may not be telling you the truth about, so CONGRATULATE yourself, you’ve already found a lot about it. Lets move forward, relax, take your time and enjoy the journey. You’re not offending or putting any of us out, lets getter done.Quote:
Originally Posted by Devon32
Perfect.Quote:
Originally Posted by Devon32
OK, this tells us you have a sizable vacuum leak (still running with mixture screws shut and whistle noise gives it away).Quote:
Originally Posted by Devon32
Not all carb cleaners raise the rpm, some cause it to lower, lets try it again as follows;
Seal all the vacuum ports (front and back) on your carburetor and spray a mist of water around everything, the water mist usually lowers the rpm and is quite noticable.
Start at idle and mist everything, then raise the rpm to around 1500 and mist again.
With the oils signs on your plug’s housing, you may not have a good enough valve cover seal to use the dip stick vacuum gauge trick for underside of intake leaks, try tightening your covers and checking again.
With the carburetor ports sealed only your intake manifold and carburetor base gaskets are left as a leak source, so this should show up quick.
Your plugs show signs of some oil consumption on a couple plugs, this could be the cylinders that were not firing and why I keep plugs in order.
You can add the choke back later to help cold starts, but it’s not the issue right now.Quote:
Originally Posted by Devon32
If you have a vacuum leak, usually you’re not going to get the timing to raise the vacuum enough to make a difference on the vacuum gauge, especially with a larger leak.Quote:
Originally Posted by Devon32
And beware, setting timing to the highest will usually be too much timing for the motor. Usually this method requires backing back off a little after highest vacuum is achieved.
The pictures of your motor show the tab at a higher placement than usually is used, there are some motor balancer combinations that use it, but it warrants checking to be sure. True TDC never lies.
I’m not a big fan of opening plug gaps up, but as Glen noted with your possible oil consumption, opening the plug gap usually helps to run the plug a little hotter and burn the oil off.
Hang in there, you’ll get this, we’re rooting for you, there are a lot of great people here helping and we all enjoy helping each other.
