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Old 07-19-2016, 10:20 PM   #1
boulevardc50
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replace crankcase or motor

I know very little about motors so please excuse if a dumb question. I threw a rod out the bottom of my 07 suzuki boulevard c50. should I replace the entire motor or just the crankcase. How much can I expect to pay for each job. I see cases for about $200 and motors for about $1500. My motor is in good shape as far as i know except for the hole in the bottom.
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Old 07-19-2016, 10:28 PM   #2
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Replace whole engine. Labor and parts will cost more than used engine
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Old 07-19-2016, 10:32 PM   #3
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The case is $200, but how much is the crank, rods, pistons, and probably a cylinder or two, plus maybe heads if the pistons tapped them? Did the transmission take on any damage?

Has it been torn apart and at least had a visual on what is damaged? Usually when you "throw a rod", it's a catastrophic failure. Buy a new engine.
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Old 07-19-2016, 11:10 PM   #4
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engine

Replace the engine.....


but shop around more. I've given a c50 engine away before. I would expect that you can find one for 400 or probably less. Plenty of wrecked bikes out there and that engine is not in high demand.
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Old 07-19-2016, 11:13 PM   #5
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Thanks for the help. I will be on the lookout for a new engine
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Old 07-22-2016, 12:59 PM   #6
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Quote:
Originally Posted by Rttoys View Post
The case is $200, but how much is the crank, rods, pistons, and probably a cylinder or two, plus maybe heads if the pistons tapped them? Did the transmission take on any damage?

Has it been torn apart and at least had a visual on what is damaged? Usually when you "throw a rod", it's a catastrophic failure. Buy a new engine.
What can cause that failure?

Thank you.
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Old 07-22-2016, 01:21 PM   #7
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over-revving, a valve or other hard part contacting a piston during compression/exhaust stroke, flaw in the rod material that fatigues and spreads a crack over time...

etc.

it's basically a descriptor for mechanical failure where the rod/piston is detached from the crank. with everything spinning inside the engine, if it's no longer attached, it just gets flung around.



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Old 07-22-2016, 01:23 PM   #8
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Quote:
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What can cause that failure?

Thank you.
Usually an over rev situation (red line) is the culprit. Now, with rev limiters, we rarely see this, though. odds are the OP has some sort of Power Commander that probably set the rev limit higher or eliminated it. Constant high revs can wear parts quickly, causing failure.

Good old fashioned oil and filter can play a part too. If oil is not getting to and protecting vital parts, they will seize.

For the most part, when an engine "throws a rod", it will be at high rpm and usually due to lack of lubrication, a piston ring will end up seizing. With all the force still being pushed by the piston, the weakest parts (connecting rod) will bend. Bending turns into snapping and with the engine still trying to rotate, part are going to go where ever they wish. With exploding everywhere, just about everything gets damaged.


There are other variables and factors, but that's the basics of it. It could easily be a defective part or a bad design somewhere.
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Old 07-22-2016, 01:29 PM   #9
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!! I normally up-shift around 4,500 - 5,000 RPM's, the rev limiter on the Victorys is at 5,500 RPM's. Am I over doing it? Sorry for going off-topic.
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Old 07-22-2016, 04:01 PM   #10
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Quote:
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!! I normally up-shift around 4,500 - 5,000 RPM's, the rev limiter on the Victorys is at 5,500 RPM's. Am I over doing it? Sorry for going off-topic.
No youre fine. The factory limiter is likely a good 10% or more below anything that would be considered damaging.

Would the motor last longer shifting at 4k rather than 5k? Maybe... probably... but who knows.

Shift before the power drops, or whenever it feels best, and dont bounce off the limter, itll be fine
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