What did I do to prevent another ouch...


13 replies to this topic
  • tmckeown

Posted March 12, 2006 - 07:17 AM

#1

As you remember, this is what happened to me...

http://i31.photobuck...PICT0230net.jpg

So I made a new shield plate from 3mm steel:

http://i31.photobuck...PICT0240net.jpg
http://i31.photobuck...PICT0239net.jpg

As you can see it should protect gear shifter better now and prevent from pending shifter axle.

With original shield:
http://i31.photobuck...PICT0241net.jpg

With new steel shield:
http://i31.photobuck...PICT0242net.jpg

Timo Mc

  • dl19

Posted March 12, 2006 - 08:32 AM

#2

Looks Good, Did you check out any of the commercial shields? I asked but no one has answered on this. I need to get one for my bike for the same reason. Ever tried the SS flange bolts instead of Phillips head. I always swap mine out as they are so much easier to remove.

  • tmckeown

Posted March 12, 2006 - 08:44 AM

#3

Hi,

Took me 2 hrs to make, so I didn't even bother to find out any commercial version. But probably if no one has answered your thread no one makes one.

I will change those phillipheads next week. They are pain is the*ss to tighten up.

Timo Mc

  • Bamster

Posted March 12, 2006 - 08:54 AM

#4

I don't run the plastic cover and I don't know anybody who does. I hate having to clean the grass, twigs and mud out of it after a ride.
That guard looks good, should help to keep your chain from getting wedged in there again.

  • Kepy

Posted March 12, 2006 - 10:42 AM

#5

I made mine out of 12 mm thick aluminium plate :thumbsup:

http://i28.photobuck...py/PICT1926.jpg

  • tmckeown

Posted March 12, 2006 - 11:01 AM

#6

I don't run the plastic cover and I don't know anybody who does. I hate having to clean the grass, twigs and mud out of it after a ride.
That guard looks good, should help to keep your chain from getting wedged in there again.


In races we have to run that plastic thingie. Won't pass pre-race checking without it. :thumbsup:

Timo Mc

  • tmckeown

Posted March 12, 2006 - 11:04 AM

#7

I made mine out of 12 mm thick aluminium plate :thumbsup:

http://i28.photobuck...py/PICT1926.jpg


You should extend it so that it will protect gear shifter also. Chains links do fit between front sproket and gear shifter and will bend shifter axle + getting chins out of there will require removing front sproket :thumbsup:

Timo Mc

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  • old man dan

Posted March 12, 2006 - 11:18 AM

#8

First the headlight mount and now this. Once again your workmanship impresses me, what do you do for a living and what kind of shop do you have access to?

  • tmckeown

Posted March 12, 2006 - 11:25 AM

#9

Hi Dan,

Believe or not I work as a Linemanager for Nokia. I have had a intrest for building things with my hands for last 20 yrs, so I have a fairly well equipped garage with mill, lathe and mig etc. :thumbsup:

I also make racecar parts and fix guns

Timo Mc

  • MotoRick

Posted March 12, 2006 - 12:27 PM

#10

Nice job, but keep in mind you've now made it possible to transmit more energy into the cast bosses that this part mounts to. That energy will likely snap the bosses off should this happen again and could result in a ruined engine case or more damage than a stuck chain. The stock part is designed to absorb a certain amount of chain energy and then distort or break rather than the bosses snapping off. Proper chain maintenance, adjustment and replacement are probably a better preventative than your new part since chain failure is not that common. Engineering requires taking into consideration the repercussions to associated parts from beefing up any one component. Sometimes, things are designed weaker for a reason. :thumbsup:

  • tmckeown

Posted March 12, 2006 - 12:43 PM

#11

Hi,

It was not a point to make it harder or more durable than make it longer to avoid chain link going between front sproket and gear shifter. Also now chain will not get that much speed to hit shield because new one is closer to chains than stock one.

Timo Mc

  • MotoRick

Posted March 12, 2006 - 01:27 PM

#12

Hi,

It was not a point to make it harder or more durable than make it longer to avoid chain link going between front sproket and gear shifter. Also now chain will not get that much speed to hit shield because new one is closer to chains than stock one.

You may not have set out to make it stronger, but that's what you ended up with. I was simply pointing out that you may be trading a minor problem for a potentially major one. Not that there isn't some room for improvement on many areas of our dirt bikes (that's why the aftermarket exists), but second-guessing the factory engineers should be done with care. There's usually a reason why a solution such as yours doesn't exist in the aftermarket.

  • robg

Posted March 13, 2006 - 10:58 AM

#13

Yes I agree MotoRick They are made so as not to wreck the case in event of a failure. I had a chain break this year and the case saver did it's job fairly well except it was at a high speed and the case was nicked. I was able a get it welded so I didn't have to replace the case. I was lucky that time.
I was going to do the same thing in beefing up a home made one but I never due to fright that it might be to stout and wreck the cases at the bolts. also I sometimes run a bigger gear on the front and there isn't much room between the case saver and the chain in that configuration.
I do like the work you did in building your saver so if your ever unlucky enough to have a chain fail and it needs to do it's job please tell us how it made out. nice work

  • Bamster

Posted March 17, 2006 - 02:58 PM

#14

In races we have to run that plastic thingie. Won't pass pre-race checking without it.



That is stupid. That little plastic gaurd does nothing but trap crap.




 
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