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Old 05-10-2010, 12:50 AM   #1
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Default V-spec (speed) backplate wear

so i just bought a used Speed and pulled it apart to inspect.

the back plate had these swirl mards on it as did the base of the con-rod facing the back plate. (PICTURED)

http://i296.photobucket.com/albums/m...uart02/004.jpg
http://i296.photobucket.com/albums/m...rt02/002-2.jpg

Im guessing the conrod and backplate made a light contact at one point. The motor still feels super smooth - no obvious rubbing and no metal pieces or anything like that. Can I still run this backplate/motor? I was thinking maybe theres something wrong with the case for this contact to be possible. Is this a huge problem.

I ask because im about to buy parts on amain and I wanna get an idea of what to buy.


Also the button and piston had alot of black carbon build up - should i try to scrap this off? I already started on the button?

http://i296.photobucket.com/albums/m...uart02/005.jpg
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Old 05-10-2010, 12:52 AM   #2
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oh and how do you get that metal retaining ring out that holds in the pin that connects the rod and piston? Do I need a special tool? Are those rings reusable?
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Old 05-10-2010, 02:50 AM   #3
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Swirl marks on the back plate and the conrod are perfectly normal.
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Old 05-10-2010, 03:51 AM   #4
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+1
Just make sure that you pull the crank as far forward as you can when putting the flywheel on.
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Old 05-10-2010, 03:51 AM   #5
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All of my speed engines have those marks too.
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Old 05-10-2010, 08:46 AM   #6
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ya same here my speed had those marks as well
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Old 05-10-2010, 09:10 AM   #7
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Same here on the swirl marks....I have them in my Speed. Not an issue.

The reason your piston and button are black is because that engine was run very rich for a long time. Take some after run oil, or WD-40, and use the soft plastic "wire wheel" on your dremel, and it'll come right off. Just go slow...
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Old 05-10-2010, 09:11 AM   #8
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Quote:
Originally Posted by wstuart View Post
so i just bought a used Speed and pulled it apart to inspect.

the back plate had these swirl mards on it as did the base of the con-rod facing the back plate. (PICTURED)

http://i296.photobucket.com/albums/m...uart02/004.jpg
http://i296.photobucket.com/albums/m...rt02/002-2.jpg

Im guessing the conrod and backplate made a light contact at one point. The motor still feels super smooth - no obvious rubbing and no metal pieces or anything like that. Can I still run this backplate/motor? I was thinking maybe theres something wrong with the case for this contact to be possible. Is this a huge problem.

I ask because im about to buy parts on amain and I wanna get an idea of what to buy.


Also the button and piston had alot of black carbon build up - should i try to scrap this off? I already started on the button?

http://i296.photobucket.com/albums/m...uart02/005.jpg
That engine is a little more than 2 gallons old.... looks like 8-10 or there was dirt run through it at some point. Also the con rod at the crank pin looks a little rough. (??)
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Old 05-10-2010, 09:15 AM   #9
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Quote:
Originally Posted by Racecrafter View Post
That engine is a little more than 2 gallons old.... looks like 8-10 or there was dirt run through it at some point. Also the con rod at the crank pin looks a little rough. (??)
every used motor has 2 gallons on it jimmy!
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Old 05-10-2010, 09:31 AM   #10
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every used motor has 2 gallons on it jimmy!
Hey now, the guy I got mine from said it only had one and a half gallons on it!!!

Regardless, clean it up, get the gunk off the piston & button, put a new rod and bearings in it (which you should do on any used motor you buy period), and run the dang thing. OS engines are known for losing pinch quickly, then running awesome on the compression that remains. If it's just too low on power, have it pinched, then run it.

Chances are, if it's that black inside, it was run way rich most of the time, which may not be ideal, but it'll do less harm overall than running it way lean all the time.
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Old 05-10-2010, 09:37 AM   #11
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Back plate wear could be an indication of bad bearings. And the black piston...haven't seen that one before. Was it run on veggie oil?
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Old 05-10-2010, 10:04 AM   #12
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yeah it was pretty obvious that the engine had more than 2 gallons.

Thanks for the info guys - ill replace the bearings and the conrod for sure.

Do you think I could use the old conrod for breakin and then save the new one for running - ive heard of people doing that. Maybe ill just use a heat gun so t doesnt stress it as much.

Also - this is an old speed with the old style carb. Wll this carb work or should i get a new one? how do i tell if the carb is bad?

thanks so much guys
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Old 05-10-2010, 10:36 AM   #13
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Originally Posted by wstuart View Post
yeah it was pretty obvious that the engine had more than 2 gallons.

Thanks for the info guys - ill replace the bearings and the conrod for sure.

Do you think I could use the old conrod for breakin and then save the new one for running - ive heard of people doing that. Maybe ill just use a heat gun so t doesnt stress it as much.

Also - this is an old speed with the old style carb. Wll this carb work or should i get a new one? how do i tell if the carb is bad?

thanks so much guys
If there's no obvious wear on the bushing, then go ahead and keep it to use for a break in rod.

My Speed had the old style carb (21H) too. The only improvement I see on the new one (21J) is the location of the idle screw, but it costs way more. I just put new o-rings in the 21H, and used it...
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Old 05-10-2010, 11:46 AM   #14
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The wear on the backplate is completely normal. Almost every engine develops those swirl marks over time. It s more noticeable on the speeds because of the backplate being black annodized.

As for the carbon buildup, it just shows that the engine was run rich for a long time(very common with the speed as people will de-tune them, to limit their power... STUPID!). You can clean it off like stubbs said. If it is not very thick buildup, I would just leave it alone.
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Old 05-10-2010, 04:28 PM   #15
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why the heck would they want to limit it's power? Are they that affraid that they are running it to lean?

I cleaned a p/s and button head up for a guy that was excactly the same. i knew the front bearing was bad and when i changed it out there was layers and layers of dirt baked on the bearing seat.

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