High “runaway” idle

Clapdblaster · Apr 9, 2019

I’m having a weird issue where my blaster will idle high i mean like HIGH HIGH after it gets hot and here’s the kicker it will keep on screaming after the kill switch and key is out for a solid 10 seconds. I’ve looked around and some people are saying air leak but that still doesn’t explain why it still runs without the key. Keep in mind this only happens when it’s hot.

Blaaster · Apr 10, 2019

You have an air leak somewhere....

An air leak will make a way too lean a mixture, cause the electrodes of the plug to glow red hot.
You do not need a spark then the red hot plug ignites the mixture....

Larry's Shee · Apr 10, 2019

FYI (for all) if you get a runaway, shift into gear, hold brake, dump clutch. Over speed can blow an engine quickly.
What happens is the plug overheats and allows auto ignition, no spark needed. Think diesel engine.

Clapdblaster · Apr 10, 2019

So how should I check for an air leak without spending $200 on a leak tester

bwilliamsky · Apr 10, 2019

Talk to Awk and spend 40ish bucks on a leak tester

Clapdblaster · Apr 10, 2019

bwilliamsky said:
Talk to Awk and spend 40ish bucks on a leak tester

Akw?

bwilliamsky · Apr 10, 2019

@Awk08 he's a prominent user on here and super helpful Also makes and sells home brew pressure testers at a much more economical price .

Clapdblaster · Apr 10, 2019

bwilliamsky said:
@Awk08 he's a prominent user on here and super helpful Also makes and sells home brew pressure testers at a much more economical price .

I guess can’t message yet I’m new around here. Apparently you need 3 likes or something like that

bwilliamsky · Apr 10, 2019

no worries, he'll be along shortly, I'm sure.

El_cheapo · Apr 11, 2019

Awk I would also like to buy a pressure tester

Larry morris · Apr 12, 2019

I had same isue was crank bearing seals replaced all seals runs fine

Clapdblaster · Apr 13, 2019

Larry morris said:
I had same isue was crank bearing seals replaced all seals runs fine

I’m hoping it’s not a bottom end seal really don’t feel like doing all that work

Larry's Shee · Apr 13, 2019

Clapdblaster said:
I’m hoping it’s not a bottom end seal really don’t feel like doing all that work

Don't be such a wussy. Very easy job, and crank seals are VERY important .CRANK seals are actually maintenance on machines this old. Get either a Clymer's Repair Manual or find the PDF on this forum. Might also be a DIY in the engine or DIY section

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High “runaway” idle

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