Spark plug adapter for leakdown tester??

[kxpower?]

Hey guys and gals,

I have this harbor freight leak down tester: http://www.harborfreight.com/cylinde...ter-94190.html

I went to play with it on the ninja (pregen), and discovered that the kit doesn't have a plug adapter small enough to thread into the plug hole. It only goes down to 12mm. Is 10 mm the right size for the ninja? Will any of the 10mm plug adapters thread right into this tester or do I need one specific to the HFT model?

I'm probably overthinking all this but chewing up my head is a headache I need to avoid!

THANKS!!

TLDR; what do I need to use the HFT tester in the link above on the Ninja?

[Ghostt]

Good question, and I have no idea, best bet is to take a plug with you, and match it up.
wish I had more for you.

I gotta ask, why are you doing a leakdown test?

[alex.s]

what i would suggest is not ever using any gauges from harbor freight. i have tried like... 4. none of them have ever worked. get a craftsman gauge.

[Ghostt]

Originally Posted by alex.s

what i would suggest is not ever using any gauges from harbor freight. i have tried like... 4. none of them have ever worked. get a craftsman gauge.

Well yeah, that too, also stay away from their torque wrench, or any other metering devices

[Motofool]

Originally Posted by kxpower?

..........Will any of the 10mm plug adapters thread right into this tester or do I need one specific to the HFT model?..........

The spark plug's thread is 10 mm exterior diameter x 1.0 mm pitch = M10x1.0.

Rub some motor oil over the threads of the HF adapters and place it sideways over a piece of paper.
If you count 10 valleys within 1 cm (10 mm), you have a 1.0 mm pitch.
If you count 8 valleys within 1 cm (10 mm), you have a 1.25 mm pitch.
Both are fine threads.
If you count around 6 valleys within 1 cm (10 mm), you have a 1.5 mm pitch, which is called coarse thread.

http://en.wikipedia.org/wiki/ISO_metric_screw_thread

http://faq.ninja250.org/wiki/Helicoi...park_plug_hole

[Racer x]

One thing I found and you should avoid. The adapter is screwed on to the hose. The adapter has a hex on the outside. When you screw the adapter into the head it will tighten up to provide a seal. When you try to unscrew the hose the adapter could stay in the head. And if the spark plug hole is not perfectly centered one of the flat sides of the hex will lock it in place. The only way to remove the adapter is to pull the head or do some tricky work down the plug tube. Ask me how I know this could happen?

[kxpower?]

Originally Posted by Motofool

The spark plug's thread is 10 mm exterior diameter x 1.0 mm pitch = M10x1.0.

Rub some motor oil over the threads of the HF adapters and place it sideways over a piece of paper.
If you count 10 valleys within 1 cm (10 mm), you have a 1.0 mm pitch.
If you count 8 valleys within 1 cm (10 mm), you have a 1.25 mm pitch.
Both are fine threads.
If you count around 6 valleys within 1 cm (10 mm), you have a 1.5 mm pitch, which is called coarse thread.

http://en.wikipedia.org/wiki/ISO_metric_screw_thread

http://faq.ninja250.org/wiki/Helicoi...park_plug_hole

Hernan you are the man. That is all.

[kxpower?]

Originally Posted by Racer x

One thing I found and you should avoid. The adapter is screwed on to the hose. The adapter has a hex on the outside. When you screw the adapter into the head it will tighten up to provide a seal. When you try to unscrew the hose the adapter could stay in the head. And if the spark plug hole is not perfectly centered one of the flat sides of the hex will lock it in place. The only way to remove the adapter is to pull the head or do some tricky work down the plug tube. Ask me how I know this could happen?

Hmm, seems like they'd make the adapter where the regular 5/8" plug wrench would fit the hex. So you're saying the hex may be a bigger size? Save a lot of headache if it were just 5/8".

[Racer x]

No the size of the tube is small. So a socket will fit around the hex on the adapter may be to thick to fit down the tube. And if the spark plug hole is not centered then the hex actually touches the side of the spark plug tube. I ended up grinding off the hex then used red Lock tight on the adapter to the hose.

[kxpower?]

Originally Posted by Racer x

No the size of the tube is small. So a socket will fit around the hex on the adapter may be to thick to fit down the tube. And if the spark plug hole is not centered then the hex actually touches the side of the spark plug tube. I ended up grinding off the hex then used red Lock tight on the adapter to the hose.

Hmm I'll be careful of that thanks Eric. I'll probably loc tite it to the hose as well.

[Racer x]

That's what I did. And lube the threads