This is my response via e-mail to Leon. Roger
Sounds exactly like my VH70 engine. I have have replaced everything you have and a few more. I can get it to start and run on my engine stand from time to time but not always. The only thing I haven't replaced is the rings and I have them here but it will probably be a Winter project. When you say you cleaned the carburetor was it by soaking in carburetor cleaner over night or with spray. Those carburetors have a small check ball in them internally that if you shake the carburetor with the float off you should hear rattle. If you can't hear the rattle you throw them away and replace with a new or different carburetor. The check ball is something that can't be taken apart to fix. The new ultra sonic cleaners may work or letting it soak longer. NEVER USE EITHER to run a small engine. If you had bad rings that will make them worse in a hurry. I don't have any answers and feel your frustrations. Roger
On Aug 28, 2014, at 7:45 PM, Leon Nelson wrote:
Roger,
Before I get to the topic at hand, nice job putting that Briggs in a 70!
So, surprisingly I got all the needed parts for my 70 project from Jacks Small Engines. Just a couple of parts I deem to be non-critical are on back order. I have it all back together but can't get it to run. It will pop a time or two until the starter kicks out, then quits! I can't even nurse it along keeping it running with a spray can of ether. I have the throttle plate above the carb positioned correctly according to the three alignment holes. The choke and throttle lever seem to function as they should. I put on new carb-to-governor linkages, including spring. The carb seemed to be OK but I went through it anyway. I soaked it out, run a tag wire through all accessible passages without taking the plugs out, blew out everything with carb cleaner and compressed air, then gave it a new needle valve and seat before setting float lever to spec. As I put the engine back together after rebuilding the governor with all new parts, I was careful to see that the camshaft is timed correctly. I didn't mess with the compression release which is on the exhaust valve. It has a good hot spark. I changed the plug. I didn't interchange the cam followers. I had the head off and the the valves look good - cylinder walls too. With no manifold nor air cleaner ahead of the carburetor, it spits back out through the carburetor some as it tries to start, but it did that before I started working on it. Except for the governor problem caused by over-speeding it started and run pretty good before I tore in to it.
I'm pretty befuddled. Could it somehow be an ignition timing problem? Of course I had the engine upside down, but didn't take the flywheel off. That's about the only gremlin I haven't chased. Any ideas or thoughts from your experience would be appreciated.
Thanks, Leon
Sounds exactly like my VH70 engine. I have have replaced everything you have and a few more. I can get it to start and run on my engine stand from time to time but not always. The only thing I haven't replaced is the rings and I have them here but it will probably be a Winter project. When you say you cleaned the carburetor was it by soaking in carburetor cleaner over night or with spray. Those carburetors have a small check ball in them internally that if you shake the carburetor with the float off you should hear rattle. If you can't hear the rattle you throw them away and replace with a new or different carburetor. The check ball is something that can't be taken apart to fix. The new ultra sonic cleaners may work or letting it soak longer. NEVER USE EITHER to run a small engine. If you had bad rings that will make them worse in a hurry. I don't have any answers and feel your frustrations. Roger
On Aug 28, 2014, at 7:45 PM, Leon Nelson wrote:
Roger,
Before I get to the topic at hand, nice job putting that Briggs in a 70!
So, surprisingly I got all the needed parts for my 70 project from Jacks Small Engines. Just a couple of parts I deem to be non-critical are on back order. I have it all back together but can't get it to run. It will pop a time or two until the starter kicks out, then quits! I can't even nurse it along keeping it running with a spray can of ether. I have the throttle plate above the carb positioned correctly according to the three alignment holes. The choke and throttle lever seem to function as they should. I put on new carb-to-governor linkages, including spring. The carb seemed to be OK but I went through it anyway. I soaked it out, run a tag wire through all accessible passages without taking the plugs out, blew out everything with carb cleaner and compressed air, then gave it a new needle valve and seat before setting float lever to spec. As I put the engine back together after rebuilding the governor with all new parts, I was careful to see that the camshaft is timed correctly. I didn't mess with the compression release which is on the exhaust valve. It has a good hot spark. I changed the plug. I didn't interchange the cam followers. I had the head off and the the valves look good - cylinder walls too. With no manifold nor air cleaner ahead of the carburetor, it spits back out through the carburetor some as it tries to start, but it did that before I started working on it. Except for the governor problem caused by over-speeding it started and run pretty good before I tore in to it.
I'm pretty befuddled. Could it somehow be an ignition timing problem? Of course I had the engine upside down, but didn't take the flywheel off. That's about the only gremlin I haven't chased. Any ideas or thoughts from your experience would be appreciated.
Thanks, Leon