Hi All,

I spent most of this afternoon trying to get a G-62 engine to run..... This is a new engine with a CH ignition unit. I retrofitted the engine with the "offset" carburetor mounting block to facilitate the throttle and choke linkage hookups. This is my first gas engine, but I have been reading a lot here on RCU, and I did have help from a friend who is very familiar with the G-62. I choke the engine until it is nice and wet, and then turn on the ignition. At low throttle, the engine pops and starts very reliable almost every time, but it won't run for more than about 10 seconds before dying. We tried everything to get the engine to run including removing the carburetor to check that the crankcase pressure passageway was aligned correctly (the holes in the carb. mounting block). Finally, we even swapped carburetors with another G-62 that runs great. Nothing made any change at all in the operation of the engine! As a final desperate step, I mounted the carburetor using the original carb mounting block (non-offset) and started the engine. Unbelievably, it ran and kept running! Using a manual throttle link, I was able to run the engine over its entire RPM range with no problems at all!! So, what is the problem with the offset carb mounting block??? I'm just about positive I had it mounted correctly, and I know the passageways machined into it were clear and aligned with the openings in the carb./engine! Any ideas??

Thanks,

John

Your pulse is leaking out somewhere between the cylinder and carb..Be sure the carb is mounted on the block aligned with the pulse hole in the carb. The pulse hole in the carb base is next to the cover held on by one screw..The other hole in the carb base is cast but is not drilled through..
If you mount the carb on the offset block on the cylinder and take the rear cover off (one screw) you will see where the pulse hole comes through the carb body...If you don't feel a puff of air through this hole when the crank is rotated the carb is on wrong, rotate it 180 degrees...

Hi All,

I found the problem this morning. With the "offset" carb. mounting block in place, the pressure port holes were not lining up properly. Unfortunately, I was faked out by a "phantom" pressure port hole in the carb. flange on the engine side, and mounted the carb. upside down. The actual pressure port hole was on the opposite side. Now I have to redo all my carb. linkages [:@]. Unfortunately, I posted a plea about this very issue on RCU a few weeks ago ("is my carb. mounted correctly"?), and no-one caught the error. I'm a little bit peeved at Zenoah/Horizon Hobbies because the "offset" carb. mounting block came with NO instructions to show how it MUST be installed. Not a big deal for the experts, but this is my first gas engine! Arghhhhhh!!!

Thanks,

John

We feel your pain. Unfortunately, some industries/manufactures assume you are an expert or you would not be buying there product. Well, like you said, How the heck you gona become an expert without instructions. [sm=confused.gif]Funny, there are all kinds of instructions on Preparation-H on how to use a suppository, [sm=eek.gif]but buy an engine and --- your on your own. Go figure, you get instructions on how to stick your finger -- ---- ---, but none on how to start an engine.