[Shop-talk] M*th%&$#c<ing small engines d*mn again

[Jim Franklin]

If the valves have tighened up, which is normal as things wear, they won't be sealing and you won't have enough compression to light off the charge, or when it does light off it's leaking out instead of making power. Is there an adjustment available on this engine? I don't know tiiny 4 strokes at all. I would think they'd build it with more clearance than woul devery be used up by wesr. Can you do a compression test on the cylinder? Leakdown test? Does it feel easier to start (assuming a pull start) than when it was new? A leaky valve would make it feel easier - the more leaky the easier it would be.

You checked the spark plug wire for cracks? Can you try it in the dark and see if the spark leaks out of the wire anywhere?

jim

> On Aug 5, 2020, at 5:09 PM, Scott Hall <scott.hall.personal at gmail.com> wrote:
> 
> The carb is getting fuel. I can see it in the fuel lines and it pumps using the primer bulb. 
> 
> The symptoms are identical with the old and new carb. I can't see the end of the fuel line but the only remaining fuel issue could be that the new fuel filter (a pumice stone-like thing on the end of the fuel line) could be restrictive. Working against that theory is that it did the same thing with the old fuel filter. 
> 
> I don't think the problem is the fuel system. The problem is...what's left? I swapped the spark plug just to do it. 
> 
> It's a four-cycle engine. Might the valves (like the intake and exhaust valves in the head) come out of adjustment? This condition has been developing over more than a year...perhaps the valves are slowly coming out of adjustment?
> 
> I don't know what conditions un-adjusted valves cause. I can't think of what else it could be.
> 
> On Wed, Aug 5, 2020 at 3:23 PM <alfuller194 at gmail.com <mailto:alfuller194 at gmail.com>> wrote:
> Can you confirm whether it is actually getting fuel to the carb? Try starting it with ether/carb cleaner/gasoline directly to the carb?
> 
>  
> 
> ----------------
> 
> All the best,
> 
>  
> 
> Al Fuller
> 
>  
> 
> From: Shop-talk <shop-talk-bounces at autox.team.net <mailto:shop-talk-bounces at autox.team.net>> On Behalf Of Scott Hall
> Sent: Wednesday, August 5, 2020 4:06 PM
> To: Shop-talk at autox.team.net <mailto:Shop-talk at autox.team.net>
> Subject: [Shop-talk] M*th%&$#c<ing small engines d*mn again
> 
>  
> 
> Troy Bilt four-stroke backpack leaf blower.
> 
>  
> 
> Replaced the carb and plug.
> 
>  
> 
> No change in symptoms: hard start, choke useless, engine bogs on application of throttle.
> 
>  
> 
> That sounds like fuel/air to me. That's the carb. The carb and plug are brand new. The old carb and plug look fine and it's doing the same thing. The carb isn't the problem.
> 
>  
> 
> I am literally out of ideas. Any idea what to look at next before I just toss it?
> 
>  
> 
> Thanks and (*&^*&%&#()_#@&*$&#^&^%.
> 
>  
> 
> Scott
> 
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