Re: Precision ?

On 6/21/2025 12:25 PM, Snag wrote:

On 6/21/2025 1:17 PM, Leon Fisk wrote:

On Sat, 21 Jun 2025 12:51:01 -0500
Snag <Snag_one@msn.com> wrote:
>
<snip>

I thought it was fuel starvation , but that wasn't it . No power ,
governor surge , and it dies under load . Choke on/off makes no
difference and I've done a spray solvent vacuum leak check . I've
thoroughly cleaned the fuel tank and replaced the carb and all fuel
lines . This is a Viper 196cc OHV engine , and I have put a lot of hours
on it in the last 9 or 10 years . Might just be worn out ...

>
Had a nearly new Weed-Whacker with similar symptoms. It would start and
kinda run. Hit the throttle and it would die out. Also die out if you
let it idle for several seconds...
>
Mud wasps had built a nest in the exhaust pipe/muffler almost
completely blocking it off. I didn't notice in your trouble shooting
anything about the exhaust...
>

    No , you didn't ... a bit late now since I've fitted the drive coupler to a larger crankshaft but I will check that . If I can figure it out I'll keep this motor for a replacement for the tiller . The new motor was originally intended for the tiller , but it recovered from it's problem and has been running fine .

My dad once spent a year fighting with one of the two 4 cylinder Chevy engines in a Searay sport fisher.  He finally broke down the exhaust system and found a wide thin wedge of rust about 75% obstructing the exhaust.
I never think of checking the exhaust either.  19 out of 20 times when I have small engine troubles its air box or carburetor.  Usually plugged. Sometimes float stuck.  The 20th time its usually down to being completely worn out.
Rarely is a spark plug bad, but I have had bad coils or coils that were to far from the flywheel.
--
Bob La Londe
CNC Molds N Stuff
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