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Decompressor on an AT1e

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Decompressor on an AT1e was created by Agop

Hello all ...  
I have an At1 e which has the cylinder changed to 175cc.
So at moment electric start is not powerful enough to crank the engine.
Just wondering if anyone has done or think it will work..... adding a decompressor in spare plug hole, so the electric start would work.?
Any suggestions.
Thanks.
bernard.
Bernard. ( UK - Berkshire )

Yamaha AT1e
The following user(s) Liked this Post: DaveHunter, Pete-RT1
16 Nov 2021 08:17 #1

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Replied by DaveHunter on topic Decompressor on an AT1e

Good question bud,  I also have a 175 conversion and it will crank over very fast without a spark plug installed. A decompressor might be just enough to make a difference 
16 Nov 2021 16:29 #2

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Replied by MarkT on topic Decompressor on an AT1e

Those "chainsaw" self-closing button types work great on Harley's so should work great on an AT! 

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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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16 Nov 2021 17:31 #3

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Replied by Rick C. on topic Decompressor on an AT1e

Please try it and report back !!
16 Nov 2021 18:56 #4

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Replied by Agop on topic Decompressor on an AT1e

Thanks for your comments.....  I will try....
... as soon as the engine is back together..... I had a broken drive axle to replace!....

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Bernard. ( UK - Berkshire )

Yamaha AT1e
16 Nov 2021 23:54 #5

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Replied by RT325 on topic Decompressor on an AT1e

Just kick start it. Advance mechanism will be on retard at kick speed so won't kick back. Electric might start it when hot with a top output cold cranking battery with a 175 top end. I didn't know that main shaft was hollow--week point & looks like evidence of an oil hole in the break so a double week spot. Worried about mine now--175 top on an AT1 magneto model.
17 Nov 2021 13:06 #6

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Replied by MarkT on topic Decompressor on an AT1e

I'd inspect the kick gears carefully
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
17 Nov 2021 15:29 #7

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Replied by apex on topic Decompressor on an AT1e

Others have said it and I've experienced it twice, with two AT's with 175 top ends. Electric start can't make it happen engine cold. But these are so easy to kick over cold, it's not a worry. Engine warm however, you can impress your friends with the electric start because it works great. At least has for me, and others have reported this too.
Allrighty Then
18 Nov 2021 18:57 #8

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Replied by DaveHunter on topic Decompressor on an AT1e

  I bought a decompressor and installed it, will post results soon . 
   
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10 Dec 2021 18:11 #9

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Replied by Agop on topic Decompressor on an AT1e

Dave,,, so ? is the decompressor work with the electric start ?
Bernard. ( UK - Berkshire )

Yamaha AT1e
07 Jan 2022 08:23 #10

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