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Break in procedure...

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shockerfd

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I called today to find out why my new engine blew. The report from cust rep says improper break in. I wasn't buying that so I asked to speak to a tech. Now I've heard many different methods to breaking in engines, this one particularly. I was only about 10 minutes into cruising before this engine went down, at about half throttle, varying the rpms to that point as directed. This tech had a little more in depth approach to breaking in an engine which I thought sounded extreme. Well, upon telling him the same cylinder on the engine (single 787) happened to both engines, he now believes the carb could be at fault. According to him, although carbs have been rebuilt, that doesn't guarantee you that they are fine. My thoughts too is the carb. So, I guess I'm asking two things here. Your opinion on the carb being an issue and your break in tips. Thanks
 
If the carb was miss adjusted(too lean) it could have caused the problem. As for the break in it is recommended to foll the manufactures recommended procedure just in case there is a problem.

Karl
 
Yes, the back cylinder on both engines blew. Carbs have been rebuilt and adjusted according to specs. But does that mean all is well?
 
Break in.........?

From what I read in your profile, you must be talking about break-in of a newly rebuilt motor or replacment motor (like from SBT).

Two things here. If you get a newly OEM remanufactured motor or one newly rebuilt, you are suppose to run a 32:1 oil ratio in premix for one tank. That's not counting what your oil injection pump is already supplying.

Second, in most situations, the Mikuni twin carb setup uses two different size main jets. In the 1997 model 787cc for instance. The MAG carb uses a main jet size of 145 and the PTO uses a 140. The pilot jets are the same size.

One last thought. Who ever did your work replacing the engine, did they check the syncronization of the carbs and when they did, did they check to ensure that the oil injection pump was still in sync to the carbs?

Replacing the engine, it would have been procedural to do a bleed and test of the oil pump also............

Lots of extenuating circumstances that could have contributed to the engines failure. But normally, the mechanic that does the work, normally goes over with the owner to make sure he knows how to burn the motor in so that you have a motor with a good, long lived motor..........:(
 
Upon installation of the new engine we did the block off plate, eliminatiing the oil pump. Premix is 40:1 as SBT recommends. Carbs were synced and set-up to the engines specs. I talked to the techs at SBT prior to break in and just recently when I called about my engine. They weren't two entirely different procedures but apparently I did nothing wrong that should have caused an issue. I'm just wondering if my one carb is bad and what others did at break in. Carbs have been rebuilt. What else can go wrong with them?
 
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