Can anyone help, I have now got my homy to start and run with a starter but the engine seems to be over revving at idle, how do I slow down the idle I am out of adjustment on the throtle linkage / where are the jets to adjust the mix etc. any info or pics will be gratefully received. Thanks, Joe

The newer Homies don't have an idle adjustment screw. You might have to replace the carb.

Jim

If it has the ZAMA carb, you can reduce the idle speed by plugging the holes on the carb butterfly. However, you will find the standard carb will lean out at high RPM. I modified my ZAMA endlessly until I simply replaced it with a Walbro WA-167. Tunability, power, and peak RPM increased enormously.

I have actually changed the butter fly with one that has no holes and it has nade a vast difference to the idle control, at the same time it doesn't sem to have made any difference to the top end and throttles really well, only time will tell when I manage to get it on a model. Joe

Don't be fooled into thinking it will fix itself in the air. Better to get another carb if yours doesn't have both high and low mixture needle adjustments, and get the engine to run perfectly on the ground. The late model smog engines are set to run really lean, and this is worsened when you leave off the air filter, and/or open up the muffler for more power. If it is lean in the air, it will overheat and quit, maybe at a really bad time causing you to lose the model. The engine will probably also suffer damage from the lean run. It's just not worth it....

AV8TOR

av8tor, thank you for your comments I will attempt to get a different carb, I did read somewhere that the one I have has hidden needles but I can't find where they could be, thanks again. Joe

If it's the ZAMA C1Q carb the needles are hidden behind the plastic restrictor. You can cut it off but then you'll find the low end needle is a press-fit into the carb body with no means of adjustment. It's not worth trying to convert that needle so it works normally. Even then, you'd find the high speed needle won't flow enough fuel and the engine will lean out.

The holes in the carb butterfly can be sealed (pick a method that won't come loose) which will give a good idle.

Even after boring out my carb and making some additional mods the best RPM was 7500rpm with some heavy choking. The high speed simply couldn't supply enough fuel and choking helped draw more fuel through it.

Replace with a WA-167 and you'll be able to get perfect mixtures and 8000rpm.

Another thing I found was that some people tune these engines like glow engines. If you aren't expert at tuning them here's a quick way to get started: Assuming the engine idles and transitions fine, tune the high end needle the reverse of what you'd do for a glow motor. Keep richening it at WOT until it doesn't like it, then lean just until it peaks (maybe a 1/2 turn from rich stumbling).

Note the above tuning method won't yield optimum tune but it will prevent lean out related deadsticks on take off and give solid power.

Yet more useful info, thanks Raven every bit is so help full, Joe