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Old 10-08-2009, 12:30 PM   #1
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Default Help with a back plate....

Hello, I'm trying to convert my 8ight over to a bump box. Everywhere I looked people were saying to get this back plate for the mach 427. http://www.thercshack.com/browseprod...ateSWK.26.html

I got it in today but when I try and put it on it feels like it is hitting the rod and it sticks out a little bit. when I push it in to where it looks almost flush that's when I can feel it rubbing.

Can someone help with this. I have a race next weekend and I'm trying to get my buggy fitted for a bump box insted of a roto start.
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Old 10-08-2009, 12:57 PM   #2
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http://www.horizonhobby.com/Products...ProdID=DYN0922


This is the one that you need..... Sorry....
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Old 10-08-2009, 01:26 PM   #3
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Just a thought, could I grind the one I have down or would that be a good idea?
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Old 10-08-2009, 01:41 PM   #4
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did you grind off the ta were the crank canects to the roto start wheel? i dont see why you couldnt grind the plate down some, remember you can always take more off and its very difficult to put more on.
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Old 10-08-2009, 03:38 PM   #5
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Quote:
Originally Posted by Tate72 View Post
Hello, I'm trying to convert my 8ight over to a bump box. Everywhere I looked people were saying to get this back plate for the mach 427. http://www.thercshack.com/browseprod...ateSWK.26.html

I got it in today but when I try and put it on it feels like it is hitting the rod and it sticks out a little bit. when I push it in to where it looks almost flush that's when I can feel it rubbing.

Can someone help with this. I have a race next weekend and I'm trying to get my buggy fitted for a bump box insted of a roto start.
The backplate you posted is the correct one for the mach 427. I know since I used that one in my old mach when I converted to bump start. There has to be something wrong if it wont fit.
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Old 10-08-2009, 06:29 PM   #6
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Maybe I'm doin something wrong. I took off the roto start Black cone thing then there a plate left which had the tab on it with the part that went into the back of the motor. Is the inside of the plate just supposed to come out and the plate supposed to stay on and put the back plate for the bump box on threw the silver plate?
If that's right I'm going feel stupid.
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Old 10-08-2009, 09:29 PM   #7
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I don't understand what you mean...

Its kina hard to explain. You have to remove every single part of the roto-start so you just see the crank and rod. Then insert the back-plate so that the flat part is facing the top of the motor.
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Old 10-08-2009, 09:43 PM   #8
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Ok I did it right then. I did all that but when I put the new back plate in and then it stops right before it's all the way in. When I try and turn the crank I can feel it grind on he back. I have part of it grinded down now though. I will finish in the morni g when I get home from work. Everywhere I read it says that this one will work so I don't know what is wrong
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Old 10-08-2009, 09:53 PM   #9
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Ok I did it right then. I did all that but when I put the new back plate in and then it stops right before it's all the way in. When I try and turn the crank I can feel it grind on he back. I have part of it grinded down now though. I will finish in the morni g when I get home from work. Everywhere I read it says that this one will work so I don't know what is wrong
Hmmmmmm... that's really weird. Never had to grind anything down on the 3 motors I've installed the back-plate on.

Did you transfer the o-ring from the roto-start to the new back-plate?
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Old 10-09-2009, 05:59 AM   #10
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Well I tried it again when I got home and no dice. It still rubs. I don't know why its doin it it just is.
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Old 10-09-2009, 06:45 AM   #11
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I think you got a messed up plate. I noticed the slot that goes around probley used for the nipple of the crank.... if i were to say - that is your problem
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Old 10-09-2009, 01:18 PM   #12
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I'm just hoping that once I grind it down it will work till I can get the right one.
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Old 10-09-2009, 04:58 PM   #13
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Just to confirm, you ARE installing the backplate with the piston at TOP DEAD CENTER right? If the piston is down (much) it will not allow the backplate to go on.

Ummm... wait... that doesn't look like the one I had. Might be the same thing, but looks a little different.
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Old 10-09-2009, 06:40 PM   #14
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Quote:
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Just to confirm, you ARE installing the backplate with the piston at TOP DEAD CENTER right? If the piston is down (much) it will not allow the backplate to go on.
X2.
It'll try and crush the piston skirt basically.
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Old 10-09-2009, 08:05 PM   #15
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Well I ground down the back to be basicly flat on the back, so there is no more raised surface on it. When I put it in it didn't feel like it was grinding anymore so I bolted it on. And mounted the motor. So I'm hoping all is well now.
Thanks for the help. Maybe I should go ahead and buy the other one to be safe. Hmm dono.
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