OS engine break in ... tough to pull! what is pinching ? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-08-2005, 03:51 PM   #1
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OS engine break in ... tough to pull! what is pinching ?

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hey freind of mine bought my o.s. 15 and he's breakin it in right now ...
its damn tough to pull over .. anyone have any suggestions bout what's up with it.

he read somewhere about pinching the engine ... will give more power.
what is this ? how do you do it and is this true?

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Old 01-08-2005, 04:03 PM   #2
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That should be normal. A new engine should have alot of pinch. Or even get stuck at Top Dead Center.
The only time you want to pinch the sleeve is when it is starting to wear out. They make tools for that job.

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Old 01-08-2005, 05:50 PM   #3
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make sure when he's breaking it in, when he turns the engine off he ensures the psiton is at the bottom of its travel (bottom dead centre BDC). if is not BDC then the sleeve could seize around the piston=bad news
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Old 01-09-2005, 05:52 PM   #4
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pinching the piston is good if done right. watch out for those that try things like using a punch inside the piston or the really cheezy ring groove trick.
I keep a pipe cutter in my kit box in case I need a quick fix rebuild. you cut a groove in the piston near the top. this spreads the metal a bit and holds oil to increase compression. only good for a couple weekends at best but I have even had a hobby shop do that for me as a fix when I was starting out. charged me too.... I am still choked about that one.... long story.
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Old 01-15-2005, 12:35 PM   #5
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i know exactly wut u mean wen i bought my wasp 28 it had soo much comp i thought the pull start cord was gunna snap but i found an easy solution and bolted on my rotostart with my hip one way
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