Author Topic: 100 / 200 piston  (Read 2467 times)

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Offline mybridgestones

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100 / 200 piston
« on: March 10, 2016, 01:58:20 PM »
Hi everyone,
I was unfortunate to have a piston ring break up on my TMX 100 recently which then got jammed in the exhaust port, making a mess of the cylinder.
My question is this:
Can the piston from the 200 be used? I've noticed from the parts manuals that the rings are the same number for the 100 / 200, but the pistons have a different part number.
The part number for the 100 piston is 1341 - 5400, while the part number for the 200 is 1341 - 5410.
Does anyone know the difference between the two and can the 200 piston be used? I'm hoping so because I have one of these already.
Thanks.
Stuart

Offline bsracer

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Re: 100 / 200 piston
« Reply #1 on: March 18, 2016, 12:47:44 PM »
Is the TMX cast or chrome bore cylinder?

paul

Online BS Mechanic

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Re: 100 / 200 piston
« Reply #2 on: March 19, 2016, 10:56:33 PM »
The stock TMX uses a cast aluminum cylinder with a hard chrome plated bore.

Not sure what the difference is between the pistons.
« Last Edit: March 19, 2016, 10:58:09 PM by BS Mechanic »

Offline paul

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Re: 100 / 200 piston
« Reply #3 on: March 20, 2016, 02:34:51 PM »
Don't know much about part interchangeability. But there could be slight differences. Are the wrist pens different? What about piston height / length? Are the ring grooves located in the same position relative to the  length / height of the piston? Skirt shape difference?

Offline Old BS Guy

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Re: 100 / 200 piston
« Reply #4 on: March 21, 2016, 02:31:03 AM »
To my understanding, the piston differences are in the alloy used for the different thermal expansion values existing between the chrome bore and the iron sleeve bore. The aluminum chrome bore cylinder dissipates heat much more efficiently, requiring less different piston to wall clearance as a result. The iron bore piston would require more heat to get the skirt to proper tolerance. The rings should be dimensionally the same, but different composition. I believe the iron bore uses a chrome ring, which you wouldn't ever use on a chrome bore. I haven't looked at the compression distance, (wrist pin ht.), between the 100 & 200. Bear in mind that a portion of the part number probably refences model. Richard would know for sure, but my guess is the same part could be used in multiple models, and still have multiple numbers. I've seen it in done all over the motorsports industry.

KP
'69 Mach II RS, '67 350 GTR, '66 Sport 90 o.i., '65 90M Surf Rider, '68 100 Trail, '71 100 TMX ,'79 Honda CBX, '82 Yam 650 Turbo, '74 Norton 850 Hi-Rider, '70 Triumph 500 Trophy, '75 Suz. GT-380.

Offline mybridgestones

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Re: 100 / 200 piston
« Reply #5 on: March 26, 2016, 09:16:56 AM »
Hi,
Thanks for all the replies. I get the feeling that the difference in the number relates to the different model number for the 200. The pistons look exactly the same in design and dimension to me and are the same size, so I will probably use this.
Thanks
Stuart

 


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