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Old 01-05-2010, 10:00 PM   #1
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Thumbs down STUPID ROOKIE MISTAKE!!!!

well i bought a new alpha 7 port engine 4 days ago. decide i would take the backplate of to seal it. STUPID me it is a bit tight so i tried until i get it off. Then i see the piston is chipped and a chunk of metal sitting at the bottom of the motor. So i take the motor back to the shop and say whats going on here? they say you broke it when you took the back plate off with out the piston being top dead centre. I was so embarrassed. I have my first race meet of my life in a week and half and now have no motor and wont make it. So devasted and feel like such a d$#k. but yeah just thought i would get it off my back and any other rookies decideing to take backplate of. Just a warning

cheers
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Old 01-05-2010, 10:08 PM   #2
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one of the many lessons learned after one time. fortunately for you a piston and sleeve is cheaper than a whole motor. and while many say dont do it you could replace just the sleeve that is in there with the original once it is worn out and has lost compression to get more life out of it. replace the conrod at that time as well.
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Old 01-05-2010, 10:09 PM   #3
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It Happens to the best of us...

<--- This guy right here has done it with a Novarossi.
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Old 01-05-2010, 10:13 PM   #4
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<--- This guy right here has done it with a Novarossi.


ewwww! hehhe just joking
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Old 01-05-2010, 10:14 PM   #5
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one of the many lessons learned after one time. fortunately for you a piston and sleeve is cheaper than a whole motor. and while many say dont do it you could replace just the sleeve that is in there with the original once it is worn out and has lost compression to get more life out of it. replace the conrod at that time as well.
Alpha have said they will replace it for me for nothing as it is the first one sold in my area. Great service. I just cant wait to get it on the track
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Old 01-05-2010, 10:15 PM   #6
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I've never heard of that before how hose a piston get broken if its not at TDC when takeing a back plate off
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Old 01-05-2010, 10:19 PM   #7
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the piston went it hits bottom is actaully sliding into a grove of the back plate. so you have to move the piston up to come out of that grove, to slide the backplate off. on my sh engines i didnt have to do that so i didnt think i had to for this one but what a mistake. just made me miss my first race weekend.
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Old 01-05-2010, 10:23 PM   #8
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Originally Posted by yuppi1 View Post
well i bought a new alpha 7 port engine 4 days ago. decide i would take the backplate of to seal it. STUPID me it is a bit tight so i tried until i get it off. Then i see the piston is chipped and a chunk of metal sitting at the bottom of the motor. So i take the motor back to the shop and say whats going on here? they say you broke it when you took the back plate off with out the piston being top dead centre. I was so embarrassed. I have my first race meet of my life in a week and half and now have no motor and wont make it. So devasted and feel like such a d$#k. but yeah just thought i would get it off my back and any other rookies decideing to take backplate of. Just a warning

cheers
thats crazy , i knew exactly what this was as soon as i read the title

the mistake most people only do once
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Old 01-05-2010, 10:30 PM   #9
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if you put the piston all the down there, shouldnt be a problem getting off. the backplate, without damageing anything right?

if you seal it from the outside, of the backplate does that work good?
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Old 01-05-2010, 10:36 PM   #10
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if you put the piston all the down there, shouldnt be a problem getting off. the backplate, without damageing anything right?

if you seal it from the outside, of the backplate does that work good?
If the piston is all the way down, that means it will be fully seated in the slot in the backplate. So if you force the backplate off, the piston will chip. If the piston is up, then it's out of the groove. I can't give an answer to that second question.
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Old 01-05-2010, 10:36 PM   #11
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Yeah...... I'm guilty of that.... Well I slightly chipped it... It still ran ok! Actually it's in the closet right now waiting to go into a buggy for my dad. (after I rebuild it ofcourse!)
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Old 01-05-2010, 10:45 PM   #12
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if you put the piston all the down there, shouldnt be a problem getting off. the backplate, without damageing anything right?

if you seal it from the outside, of the backplate does that work good?
i would have to say anything sealed from the inside would be better.
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Old 01-05-2010, 10:46 PM   #13
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If the piston is all the way down, that means it will be fully seated in the slot in the backplate. So if you force the backplate off, the piston will chip. If the piston is up, then it's out of the groove. I can't give an answer to that second question.

so if the backplate wont come off ,smoothly even though the piston is all the way down then ,just turn the flywheel down more?

do you have to take the flywheel, off before you even think about taking the backplate off also?
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Old 01-05-2010, 10:46 PM   #14
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Yeah...... I'm guilty of that.... Well I slightly chipped it... It still ran ok! Actually it's in the closet right now waiting to go into a buggy for my dad. (after I rebuild it ofcourse!)
my was only a slight chip to but i didnt want to run the risk
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Old 01-05-2010, 10:53 PM   #15
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I did that to my GRP ninja last year, I filed down the edges and ran it for awhile after that, it ran great ,felt like it had more bottom end then before, LOL! Thats great that they will replace it.
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