Home › Forums › Free Flight › The Engine Shop › K&B 6.5 piston and connecting rod!
- This topic has 7 replies, 4 voices, and was last updated 7 years, 4 months ago by MikeThompson.
10/28/2015 at 11:55 pm #42388
Good day fellow flyers! After my K&B 6.5 locked up at the Muncie contest on Aug. 28th I finally got a chance to tear it apart to see what happened. Will it appears that all I need and a new piston and connecting rod!!! If any of you know of or have a replacement I’d be very interested in buying it from you. I am shooting for the King Orange contest in late Dec. to have it ready for competition.
Thanks, Scott11/01/2015 at 12:29 pm #55423Denny DockParticipant
Scott, was that on the 788? THAT engine/plane combo was smoking HOT!
DD11/01/2015 at 12:49 pm #55424
Yes Denny that was the engine on the 788!#$%&* I have a second motor I just mounted on the 788 that is a little older. Will test run after rains quite???
Scott11/01/2015 at 2:39 pm #55425MikeThompsonParticipant
Hi I have a AAC piston & liner with a billet rod. Asking price 60.00 plus shipping. AAC weight 24 grams. I also have stock piston and liner with billet rod, weight 45 grams. Asking price 40.00 plus shipping. email email@example.com/02/2015 at 5:16 pm #55426
Mike, thanks I’ll sent you an email.
Scott11/18/2015 at 9:28 pm #55427
Well, after Mike Thompson was kind enough to let me purchase a piston, rod, and sleeve for my thought to be K&B 6.5 the surprises continue!!! After receiving the components from Mike I was comparing the piston fit with the current one and found it to be quite a bit smaller than the one that was in the engine? Well I said to myself “SELF” I wonder if this could be a 7.5 sleeve, piston, and rod that had been installed into a 6.5 case??? So I tried to find the bore and stroke for each and could only find the 7.5 info. It stated that the bore should be .870″ dia. Went out and measured the I.D. of the sleeve and without getting out my trusty calibers out it sure looked really close to you guest it .870″ dia. Now after looking over the Mecoa web sight I found that there is a crank shaft listed for the 7.5 and 6.5. This got be questioning if there is a different stroke also? Can anyone tell me what the bore and stroke should be for the K&B 6.5 so I can compare to what the 7.5 states. I bought this engine off of Ebay so no telling what had been modified!!
Thks, Scott11/20/2015 at 12:43 am #55428AnonymousInactive
the bore on K&B 40’s are .840
if your piston measures less then it is not from a 6.5.11/21/2015 at 3:56 am #55429MikeThompsonParticipant
Hi Scott there is A possibility that I sent you piston & liner for a 5.8. I am setting up my new hobby room in Carson City all my stuff is still not put away. Please give me A call this weekend and we will talk about it. If you don’t have my phone # email me.
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