Crankshaft: Believe my ears or workshop manual? - Honda Rebel Forum
 
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post #1 of 4 Old 07-23-2019, 09:46 AM Thread Starter
 
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Crankshaft: Believe my ears or workshop manual?

Guys and gals,


Not that this matters, because I'm not planning on tearing into my engine anytime soon. But since I bought the bike, I guesstimated that the pistons went up and down together. It seems easier to balance to me this way. The mass of the pistons and connecting rods are easily offset with crankshaft counter weights. And my ears tell me that it is true. My ears think they hear the cylinders firing an even 360 from each other.


Yet when I look at the sketch below, from the workshop manual (page 11-0 "CRANKSHAFT/TRANSMISSION), the sketch seems to indicate it is a 180 crankshaft.


What gives?




7milesout
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File Type: jpg Crank from Workshop Manual.JPG (45.9 KB, 3 views)

2016 Honda Rebel 250 - The "Piglet."
Totally Stock at the moment.
Bought on 6/29/19 with 44 miles.
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post #2 of 4 Old 07-23-2019, 12:16 PM
 
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Single pin design:

https://www.partsfish.com/oemparts/a...nkshaft-piston

Both plugs fire simultaneously although the cycles are 180 apart, so there's a wasted spark every other revolution per cylinder.

"Ride Safe, Chop Safer" Motorcycles are not unsafe. However; they are extremely unforgiving of inattention, incompetence, ignorance, and stupidity.
Dismantling, sawzalling, and rattle canning does not make a bobber.
Those are STEPS toward customizing, not customizing unto itself.
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post #3 of 4 Old 07-23-2019, 01:02 PM Thread Starter
 
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I guess the workshop manual carried over a sketch and figured it would go unnoticed or might have added the wrong sketch accidently.


Although it is a 1992 to 1997 manual, for 125 and 250 cc bikes.

2016 Honda Rebel 250 - The "Piglet."
Totally Stock at the moment.
Bought on 6/29/19 with 44 miles.
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post #4 of 4 Old 07-23-2019, 03:21 PM
 
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Well...no Rebels were made from 88-94 so there's that. The CB250 Nighthawk debuted in 91 but aside from the cosmetic changes to the cylinder head it was the same engine from the Rebel, which carried over when the Rebel returned in 1995 (96 to the US market).

"Ride Safe, Chop Safer" Motorcycles are not unsafe. However; they are extremely unforgiving of inattention, incompetence, ignorance, and stupidity.
Dismantling, sawzalling, and rattle canning does not make a bobber.
Those are STEPS toward customizing, not customizing unto itself.
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