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Makotosun

1974 dt125 to 175

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Replied by LongStride on topic 1974 dt125 to 175

don't think the electric start is strong enough to spin it over with the higher compression,  the boost in mid-range power sure adds to the smile factor 
2ET703 Central Texas
Last edit: 06 Jan 2024 17:36 by LongStride.
06 Jan 2024 17:36 #21

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  • Enduro Rod
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Replied by Enduro Rod on topic 1974 dt125 to 175

My thoughts are that the compression ratio on the 175 a little lower than the 125 according to specs just more piston mass. I can slightly pull the compression release lever and hit the starter button
07 Jan 2024 08:52 #22

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Replied by Pete-RT1 on topic 1974 dt125 to 175

Member here AGOP has an AT1-E with a CT1 top end and it won't crank on the electric starter, hot or cold.
I seem to recall someone saying theirs does with the engine hot, guess you'll just have to wait and see.
175s certainly have a lot more go than the 125s
Yamaha CT1-B
Yamaha CT1-C
Yamaha AT1-E
Yamaha AT1-C
Yamaha CT3
1978 Yamaha DT175MX
2020 Honda CB500X
07 Jan 2024 09:40 #23

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Replied by Gr8uncleal on topic 1974 dt125 to 175

"I can slightly pull the compression release lever and hit the starter button"

Have you fitted an aftermarket compression release valve in the second spark plug hole?
07 Jan 2024 10:03 #24

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Replied by Enduro Rod on topic 1974 dt125 to 175

                                                      Not on this bike but others. The kit is sold on eBay. It’s straight 
​​​​​​                                                       Forward. What is your thoughts? Sorry about typing. Not sure
                                                      Why it does it Half the time about .
Last edit: 07 Jan 2024 11:48 by Enduro Rod.
07 Jan 2024 11:45 #25

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Replied by Gr8uncleal on topic 1974 dt125 to 175

Which kit and does it fit 14mm (M14) spark plug thread?
07 Jan 2024 12:08 #26

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Replied by Enduro Rod on topic 1974 dt125 to 175

                                                  The kit from bultaco east. Mine is 14mm 3/4 reach so you leave the 
​​​​​​                                                   Spacer out.
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07 Jan 2024 12:53 #27

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Replied by Gr8uncleal on topic 1974 dt125 to 175

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07 Jan 2024 13:07 #28

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Replied by RT325 on topic 1974 dt125 to 175

I'm a couple of pages behind, but i run an early AG175 head on a TY175 cylinder & doesn't look too out of place.
Maybe i'm just used to seeing it as it is.
Ag head is only a CT3 head.
Mind you looks aren't everything [so someone said lol] & reffering to my bike in this instance.
Sorry if ya can't unsee it now.
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07 Jan 2024 18:02 #29

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