Makita DCS430

[Ricko]

Hi, I'm messing with yet another Makita DCS430. Good spark, compression 120+psi.

I think it's flooding (every time I take the plug out it is saturated), I stripped the carb down and cleaned it and managed to get in running, started to adjust the carb when it warmed up.

Came to it 10mins later and nothing, zilch etc.

What should I be looking for in terms of the carb to prevent it flooding?

Thanks in advance.

[spudulike]

120psi sounds a bit off to me, 150+ is more like it. What gauge are you using and what does a good saw measure with it?

Carbs flooding would be due to a weak needle valve spring, a poorly adjusted metering arm or a dodgy metering diaphragm.

[Ricko]

  On 28/08/2020 at 19:12, spudulike said:

120psi sounds a bit off to me, 150+ is more like it. What gauge are you using and what does a good saw measure with it?

Carbs flooding would be due to a weak needle valve spring, a poorly adjusted metering arm or a dodgy metering diaphragm.

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I'm using a Clarke gauge, I'll try it on one of my decent Huskys as a comparison, I need to find my Gunson gauge and check that too.

I'll whip the carb off again tomorrow and have a look at the metering arm etc to see how it looks.

I'm determined to have at least one DCS430 running in my collection!

[spudulike]

Flooding will be caused by trying to pull the engine over too many times on full choke or if it is doing it by itself without trying to start it, it will be the needle valve. 

I think those Clarke gauges are for cars and unsuitable for small engines.

[DCS6800i]

It sounds daft, but... 

 

What is your "start sequence" with the saw? (what do you do, and in what order, as you try to start it)

[Ricko]

  On 29/08/2020 at 18:21, DCS6800i said:

It sounds daft, but... 

 

What is your "start sequence" with the saw? (what do you do, and in what order, as you try to start it)

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Choke out, pull. When it fires, choke in then pull to start.

 

I had it started again today, just stalling when I try to rev it up.

Ticks over quite nicely!

[spudulike]

If a saw will idle OK but as soon as you try to give it revs, the engine dies, there is probably an issue with delivering fuel on the high speed circuit.

Issues may be fuel line split, fuel filter, dirt in the carb gauze strainer, H screw not turned out enough, blocked fuel tank breather, stuck check valve, perforated pump diaphragm. Start with the gauze strainer and then move to the less likely options.

[DCS6800i]

  On 29/08/2020 at 18:39, Ricko said:

Choke out, pull. When it fires, choke in then pull to start.

 

I had it started again today, just stalling when I try to rev it up.

Ticks over quite nicely!

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As Spud says, sounds like the H screw needs a little turn just to fettle it

 

[Ricko]

Thanks, its given me a list of things to check. There cant be much up with it as it started fairly easy today.