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Where to get Decompression Valve, Universal

  • mdscott
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Where to get Decompression Valve, Universal was created by mdscott

Ideas where to get a Decompression Valve, Universal. 14mm long reach.
Similar to these


Thanks Mark
Roseville, Ca.

'03 ST1300
'75 Norton
'73 CB500K
'81 Honda CT110
'87 PW50
'64 McClane Edger
'02 Honda XR70R
23 Nov 2019 20:07 #1

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Replied by PMK on topic Where to get Decompression Valve, Universal

Many people reference using power equipment compression release valves from chainsaws. Downside is they are short reach spark plugs.

I wonder about this myself, regarding a project I was working on. Could it be, the moto guys use short reach to ensure adequate clearance with the piston? Shorter reach would tend to keep the extended valve stem within the spark plug hole.

Sorry, I do not know where to purchase what you asked about.
23 Nov 2019 22:39 #2

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Replied by KennyV on topic Where to get Decompression Valve, Universal

I know something similar is fairly common used on Harleys. Don't know anything about thread size or depth. Just an idea.
71 Z50 Minitrail
20 CB500X Halfrica Twin
21 CRF300l Rally
24 Nov 2019 04:40 #3

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Replied by 1971DT250 on topic Where to get Decompression Valve, Universal

This is what I use. Harley Davidson # 32076-04 with Alloy Art CRA-1.



You need to manually depress the button before each kick. Works well.
The hours spent riding my Enduros is not deducted from my life span.
The following user(s) Liked this Post: FrankC
24 Nov 2019 06:04 #4

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Replied by mdscott on topic Where to get Decompression Valve, Universal

Thanks 1971DT250, good find

I see you can get an adapter and install the chainsaw decompression valves.

the cheap ones are for chain saws, $10-20.
The ones made for the 14mm spark plug holes are expensive. $100-$200.

www.denniskirk.com/alloy-art/compression...49298.prd/149298.sku
Thanks Mark
Roseville, Ca.

'03 ST1300
'75 Norton
'73 CB500K
'81 Honda CT110
'87 PW50
'64 McClane Edger
'02 Honda XR70R
24 Nov 2019 08:57 #5

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Replied by darinm on topic Where to get Decompression Valve, Universal

This one looks like it it would work too.

rover.ebay.com/rover/0/0/0?mpre=https%3A...2Fitm%2F283489008572
1972 Yamaha CT2 175
1972 Suzuki TS185 Sierra
2000 Suzuki RM100
2003 BMW F650GS
2009 Yamaha WR250R
2013 Yamaha XT250
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24 Nov 2019 10:32 #6

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Replied by mdscott on topic Where to get Decompression Valve, Universal

Found this crazy thing



Thanks Mark
Roseville, Ca.

'03 ST1300
'75 Norton
'73 CB500K
'81 Honda CT110
'87 PW50
'64 McClane Edger
'02 Honda XR70R
The following user(s) Liked this Post: MarkT, darinm
28 Nov 2019 08:12 #7

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Replied by KJB on topic Where to get Decompression Valve, Universal

Weird doover.....
What does it suit?
Must work for something.
KB ( Australia)
'69 Yamaha DT1 S
'71 Yamaha DT1 .................................. '70 Suzuki T350
'72 Yamaha AT3 . ................................... '73 Suzuki T500
'86 Yamaha DT175 ..................................'68 Fuji Rabbit Hi Super 90
'06 Yamaha PW50
'94 Yamaha TW200
01 Dec 2019 02:33 #8

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Replied by JGersh on topic Where to get Decompression Valve, Universal

Posted on vft.org products by racers page.

2 - ‘68 DT1
‘70 RT1
‘70 CT1-B
2 - ‘70 HT-1’s
‘12 Triumph Scrambler
01 Dec 2019 17:14 #9

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Replied by TerryM on topic Where to get Decompression Valve, Universal


This style is great for using a compression release for engine braking but useless as a starting aid. The previous units pictured are pop-off releases for engine starting and useless for compression braking. Two different types of releases.

The engine starting aids are generally not needed on 250 and smaller engines. The engine braking units can be used effectively on any size two stroke with two spark plug holes in the head.
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01 Dec 2019 20:11 #10

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