CS100 hunting at full throttle

[ostosix]

 

 

Hi folks a while ago my CS100 was getting bogged down and cutting out, so changed the filter below the tank as fuel wasn’t free flowing. 
 

At it again but its hunting now at higher throttle. Im sure i heard that these sometimes do that but most guidance says the governor should hold it steady even under load.

 

Any thoughts I’m thinking this is just a carb strip clean out jets to sort this? Any pointers gratefully appreciated. 

cheers

God Save the King!

[Stephen Blair]

From day 1 of owning my cs100 I had a bungee holding the choke in as it would come on.  If the engine jolted it would come on and engine would die, blocking chute etc 

[Jase hutch]

As said by Mr Blair , the choke design is a poor one and there's a spring clip that holds the choke in the desired position and it's prone to failure.

[Bob The Dog]

I’ve owned a cs100 for a few years and had both the issue of the choke lever moving forward and applying choke when running, and also a blocked jet in the carb. Both are easy fixes. You can access the carb jet by taking the fuel tank off and the bracket at the top that holds the air filter on, then the top of the carb can be removed, revealing the jet. It’s been a couple of years since I last did it, but it was fairly obvious once I started taking things apart. I found that the loose choke control completely killed the engine, rather than just making it hunt. A blocked jet may likely be the issue. 

Edited September 10, 2022 by Bob The Dog

[ostosix]

Cheers chaps, i always watch for the choke slipping on, does happen on this one too.
 

There was a bit of crap in the small longer jet and lots of scum in the float chamber.

 

I’ve only gone and dropped the wider one (accessed behind the bolt)behind down somewhere by the castings!

 

sure they cant be too much?

[PeteB]

"Hunting" can be caused by a poor damper that is now allowing the governor to open too much which then closes the throttle to stop over rev and the cycle continues. Try to tighten the clamp on the governor to see if that helps?

[Will C]

While your there check the springs on the throttle/govnor linkages, I can’t remember which one but I had one stretch which caused hunting issues, not on a cs100 but the same vanguard engine 

[ostosix]

Will do cheers chaps! Everything looks in order.

Found my main jet at 2200 ha ha,dropped out of engine and before trying to get flywheel off i thought i’d drop the drum, there it was sat right in the middle when i tilted the chassis back!

Lucky there. My own fault for tackling the carb clean while nippers were running round so not giving it the full attention req’d.
nice to have give it a good once over mind-So rebuilding now!! Late one.
 

When your having morning cuppa check in and i’ll tell you if it’s fixed😂

[ostosix]

I’m shattered all back together now. 

[Jase hutch]

Is it fixed ?? 😉