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Author Topic: Simplex 45-47 H Motor Build  (Read 10250 times)
cocina_47
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« Reply #30 on: August 23, 2016, 03:56:53 PM »

Let me know if that works for you guys.
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pd
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« Reply #31 on: August 23, 2016, 06:41:26 PM »

Worked for me , Dave .

It seems that the twist tube in your video would need a push type set up in order to function as throttles do today .

I'm not sure if all years / models used the pull set up .

Pete . Smiley
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cocina_47
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« Reply #32 on: August 24, 2016, 03:41:02 AM »

Pete,
I'll have to do more research. My problem is the bike never ran the whole time we've owned it so not sure how it worked when it ran. The throttle cable that was on it when I took it apart was braided Huh
Maybe I can find a twist grip with the cam surface cut in the opposite direction. The other option would be to get one made.  Undecided
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RickS
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« Reply #33 on: August 24, 2016, 05:16:47 AM »

OK Dave, now I see what you have.  I concur, I can not see how that would work in the normal direction.  I don't have an early style to take apart at home, so here is what that part should look like.  As you can see in the drawing from the Simplex 125 manual, dated 1953, in the obsolete parts section, the cut is the opposite direction.

Call Wayne this morning and see if he has one, and have him take a picture of it.  

Now to the detective work.  As KartJockey has the same situation, I wonder if Simplex just simply ran out of the throttle side tubes, and occasionally substituted a left side to keep production rolling?  Are they interchangeable?  Does anyone else out there have this situation?
« Last Edit: August 24, 2016, 05:21:46 AM by RickS » Logged

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« Reply #34 on: August 24, 2016, 06:48:55 AM »

Rick ,

They couldn't be interchangeable and have the same end result with the same 'driving' action .
It's not possible , unless one were a push and the other a pull set up .

Pete . Smiley
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cocina_47
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« Reply #35 on: August 24, 2016, 07:12:59 AM »

Rick,
Yes they are interchangeable. But as you can see it does make it operate the wrong way.

Pete,
I think Rick was asking it they were interchangeable to go along with the theory that if they ran out of right side grips they would use a left to get the bike out.
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cocina_47
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« Reply #36 on: August 24, 2016, 07:23:02 AM »

Rick,
Is Wayne available during the day? I've only ever talked to him in the evening.
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pd
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« Reply #37 on: August 24, 2016, 07:28:03 AM »

As 'flexible' as the company was with changes year to year and models , anything was possible . Still , for safety sake , I'd think they would have to change from pull to push set up along with the tube change .

Pete . Smiley
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RickS
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« Reply #38 on: August 24, 2016, 07:34:41 AM »

As 'flexible' as the company was with changes year to year and models , anything was possible . Still , for safety sake , I'd think they would have to change from pull to push set up along with the tube change .

Pete . Smiley

Pete, do you think the assembly line worker in the 1940's was worried about safety?  LOL   



I usually call Wayne early in the morning, as he is an early riser. Just remember that he is in the central time zone. 

If I really need to speak with Wayne, I have his cell number!
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pd
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« Reply #39 on: August 24, 2016, 08:08:59 AM »

The workers may have been a bit less enthusiastic about safety than the head office . I wouldn't think the workers were empowered to make changes like that .

Pete . Smiley
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RickS
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« Reply #40 on: August 24, 2016, 08:44:29 AM »

The workers may have been a bit less enthusiastic about safety than the head office . I wouldn't think the workers were empowered to make changes like that .

Pete . Smiley

This is just after the war. I bet they did what they had to, to keep the production moving.  No OSHA, EPA, NTSB, or other Federal agency breathing down their necks.
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pd
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« Reply #41 on: August 24, 2016, 09:01:13 AM »

True , That^ .

Pete . Smiley
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cocina_47
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« Reply #42 on: August 24, 2016, 06:05:01 PM »

Okay Gents, mystery solved Cool
I called Wayne tonight and he explained to me that throttle on my carburetor is sprung in a way that without tension from the cable the motor is running wide open.
So with the cable connected and the twist grip in the full forward position (cable extended) the motor is at idle. Twisting the grip back toward the rider (normal throttle open) relieves the tension the spring allowing the motor accelerate.
If the throttle cable were to ever brakes on this set up the motor would run full bore. Shocked  It sounds like strange way to set it up but looking at the carburetor Wayne is correct. You have to push against the spring to get the throttle up against the idle screw. 
The light is bad in my garage so I will take a little video tomorrow to show that.
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« Reply #43 on: August 24, 2016, 06:35:51 PM »

So , basically it is a push set up .

No wonder they changed it to be a normally closed throttle .

That full open set up could be huge trouble .

Pete . Smiley
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cocina_47
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« Reply #44 on: August 24, 2016, 06:47:07 PM »

I would classify it as more of a pull. Grin It still uses a braided cable.
It probably took a couple of broken or slipped cables to figure out that wasn't the best idea.  Cheesy
I also agree that the wide open thing. Could be problematic. Roll Eyes
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