242XP revving its little socks off - help please

[Tom at Heartwood]

My 242XP started running at high revs today, not responding to the throttle and not switching off. Your advice please. Cheers, Tom.

[TimberCutterDartmoor]

It's a 242xp - it's supposed to go like a rocket!

 

Well, 15,500 rpm max rpm anyway.

 

Sounds like it's going lean - air leak...???

[blazer]

Spud often mentions a leak in the flexible connection between the cylinder and the carb. If it hasn't do it before it could be that or any of the normal checks; fuel filter, etc.

[Tom at Heartwood]

Thanks for that. I've just cleaned filter and reset jets and it seems OK for now.

[spudulike]

Thanks for that. I've just cleaned filter and reset jets and it seems OK for now.

 

Sounds a bit iffy - be worried if you have a varying idle, a racing idle, a boggy midrange and no high revs or high revs that just sound too high - all are possible symptoms of varying degree of airleak or leaning out- can be other things such as stuckthrottle linkages but make sure the saw has settled down to normal running.

[Tom at Heartwood]

Sounds a bit iffy - be worried if you have a varying idle, a racing idle, a boggy midrange and no high revs or high revs that just sound too high - all are possible symptoms of varying degree of airleak or leaning out- can be other things such as stuckthrottle linkages but make sure the saw has settled down to normal running.

 

Thanks - will do. It threw me a bit that it carried on running even when the stop switch as in the stop position but the switch does seem fine now.

[Mesterh]

First thing I would check is that the carb isnt being jammed open.

 

Then as mentioned an air leak, but with no throttle response at all I think its probably a jammed carb.

[spudulike]

The saw not turning of may be a faulty switch, damaged wire or poor connection on the coil, would agree that the saw not having any throttle response may just be a jamming linkage - had a 346XP where the linkage caught on the rubber boot just in front of the handle giving an uneven idle.