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Please Don't Laugh '71 HT1

  • Jimbo56
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Please Don't Laugh '71 HT1 was created by Jimbo56

Okay, so I might give everyone a good laugh for the day, I will ask this question.

Does a 1971 HT1 90cc have a reed valve? I have studied the diagrams, but don't see that this little motor has one. Any knowledge shared by the experts is greatly appreciated. 
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08 Jun 2021 15:00 #1

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Replied by Rick C. on topic Please Don't Laugh '71 HT1

Shoot us some pictures.
I am kinda interested too.
I was looking at that year HT1 in Partzilla and it has both Flange and Spigot mounts.
www.partzilla.com/catalog/yamaha/motorcy...1971/ht1b/carburetor

 
Last edit: 08 Jun 2021 17:19 by Rick C.. Reason: I'm long winded.
08 Jun 2021 15:27 #2

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Replied by RT325 on topic Please Don't Laugh '71 HT1

No reed valve. That started the next year with LT2. Interesting parts pic though & wonder if the bolt up type was for the Go Fast Cylinder as clamp type had limited room for oversizing. I assembled those bikes new out of the box & had a barn fresh--under a bush fresh lol-- one recently which i got running like new after freeing the piston from the bore. Green tank one. Had a demo one at work in "70 with the race kit & man it was 'so fast'--too fast for the primitive suspension. Can't recall if it had the bolt up carb on that but suspect it did.
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Last edit: 08 Jun 2021 15:46 by RT325.
08 Jun 2021 15:30 #3

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Replied by JGersh on topic Please Don't Laugh '71 HT1

No Reed valve on the HT1 90.  Piston port only…
‘68 DT1
‘70 CT1-B
‘70 HT-1
‘12 Triumph Scrambler
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08 Jun 2021 16:18 #4

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Replied by RT325 on topic Please Don't Laugh '71 HT1

Gave up googling for a race kit gyt cylinder but my HT1 showed up 'as i bought it home'. I'll leave the pic small so you 'don't have to hurt your eyes' looking at it. Be good to have a full size pic of yours sometime.
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08 Jun 2021 16:20 #5

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Replied by Rick C. on topic Please Don't Laugh '71 HT1

Yep, Jeff is correct ! Piston Port.
I wondered why the Spigot mount tho...
had to download the Service Manual in the Tech Library above to see why, on page 16 it show the intake
 picture ( 4-3-1 )

It just made me like these little bikes even more now !
But the question remains about the Flange Mount picture on the Partzilla ( normally pictures in the broken line   de-notes MX version. ) which makes me think I need to check out the 71' HT1MX. 
hmmmmm

 
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Last edit: 08 Jun 2021 18:05 by Rick C..
08 Jun 2021 17:35 #6

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08 Jun 2021 18:00 #7

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Replied by Swoop56 on topic Please Don't Laugh '71 HT1

On a close inspection of the two brochures . The HT1 B has a spigot mount carb ,
and the HT1 MX uses a flange mount carb .
Never noticed that before either .
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08 Jun 2021 18:33 #8

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Replied by Rick C. on topic Please Don't Laugh '71 HT1

Hope we didn't scare Jimbo off !?!
Would like to see pictures of his bike ( Purple or Yellow ! )
William, your bike is a PEACH ! no need to hide it.
AND yes, Swoop.... it opened my eyes too. now I want one. MX version tho....

Sorry to hijack JIMBO !!
08 Jun 2021 18:47 #9

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Replied by yamayeeha on topic Please Don't Laugh '71 HT1

Just something to throw into the mix......

After a discussion via email with enduronut about first reed valves across 250 and 360's - part of what he came back with - in Japan reed valve HT90 april 71, and GYT kit for same model may 71.
It appears Japan got a few models early.
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Last edit: 08 Jun 2021 22:19 by yamayeeha.
08 Jun 2021 19:05 #10

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