Piston Ring Compatibility from Old Gen to New - Honda Rebel Forum
 
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post #1 of 7 Old 06-20-2019, 01:35 PM Thread Starter
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Piston Ring Compatibility from Old Gen to New

Hey all,

I've found the post below from Buickguy, detailing model year compatibility. In it he points out that heads will not swap between the engines. My question is whether pistons and rings will swap and fit within the heads.
I'm assuming that just because the head mounts differently to the engine, that doesn't mean the inside diameter isn't exactly the same. However, the part numbers are different. I'm curious if this is for some other reason than the actual size of the part.
I have some older rings and pistons and want to know if they will work on my Nighthawk 250.

Ring Set:
First Gen is 13011-KB4-305
Second Gen is 13011-KBG-305

Piston:
First Gen is 13101-KR3-306
Second Gen is 13101-KR3-013


Quote:
Originally Posted by Buickguy View Post
There are some things that swap,others don't. Headlight changed in 2001 from the sealed beam to an H4 composite.
85-87 was the first generation, 96 and up for second with the 2001 headlight change.
Front brakes swapped sides and use different pads between generations. To use the newer wheels, you would also have to change forks. Entire fork assemblies will swap into the trees but you would have to swap front wheels as well. The rear brake shoes are also different between generations. Again, the entire wheel and brake panel would have to swap as a unit. You would also have to know what year wheel you are running to get replacement shoes/pads.
Footpegs do not swap between the generations. passenger pegs will swap but have a different appearance.
Front signal mounts are different between generations.
Minor harness differences exist between generations. Specifically, the ICM will not plug and play. Second gen Rebels have side stand safety switches, first generation do not relying on a rubber pickup foot instead.
49 state first gen use a vented gas cap and non vented tank. second gen have vented tanks but not vented caps. California emissions models all used vented tanks going in to carbon canisters but otherwise the tanks will bolt across. Seats should bolt across.
rear shocks should swap.
Engine will swap across complete but heads and valve covers will not swap across engines between generations. Starter motor is different between generations.
Side covers are different between generations. Battery size is different between generations. Main fuse and location is different between generations. Lighting fuses are different values between generations. Speedometer/ Instrument panel is different between generations. Ignition switch is different between generations.

Rear fender, fender rails, tail light, plate bracket, chain guard and rear signals are the same
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post #2 of 7 Old 06-20-2019, 03:37 PM
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Welcome. What year is your Nighthawk? I'm assuming the Nighthawk engine would be comparable to the Rebel engine of the same year(s). So if you have an 1985-95 Nighthawk, pistons and rings from a first generation Rebel engine (1985-87) should fit, and ditto for the second genertion Rebels, 1996-2016 and 1996 & up Nighthawk. All years may be interchangeable, but I'm not 100% sure of that. Someone else may have the answer.

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
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post #3 of 7 Old 06-20-2019, 06:46 PM Thread Starter
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Quote:
Originally Posted by flitecontrol View Post
Welcome. What year is your Nighthawk? I'm assuming the Nighthawk engine would be comparable to the Rebel engine of the same year(s). So if you have an 1985-95 Nighthawk, pistons and rings from a first generation Rebel engine (1985-87) should fit, and ditto for the second genertion Rebels, 1996-2016 and 1996 & up Nighthawk. All years may be interchangeable, but I'm not 100% sure of that. Someone else may have the answer.
Thanks for the reply! I've read a few of your posts already in some other threads while trying to figure this out haha.

It's a 2007, so second gen. It may have added a little unnecessary confusion to point out that it's a Nighthawk but I figured specificity is good.

I know the parts would be the same across CB250 Nighthawk to CMX250 Rebel. And to clarify for other readers, I'm hoping to transfer from a first gen Rebel to a second gen Nighthawk.

It seems like they would fit, right? I know it will be tough to find a 100% on this but maybe someone on here has some of each lying around and some spare time to put a micrometer to it. The parts for the original rebel are significantly cheaper, especially used.

Another thought I have is just transposing sleeves. I've never really done a rebuild before, so I am not sure if this is a stupid question, but could I just get a decent used jug from an old rebel and knock the sleeves out, then put them in my bike, hone them, throw the old rebel pistons in and be good to go?
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post #4 of 7 Old 06-20-2019, 07:39 PM
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I don't believe the cylinders are sleeved. https://www.cheapcycleparts.com/oemp...e030f/cylinder

You should be able to hone or bore the cylinders and put the appropriate size piston and rings in it.

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
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post #5 of 7 Old 06-20-2019, 07:50 PM Thread Starter
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Quote:
Originally Posted by flitecontrol View Post
I don't believe the cylinders are sleeved. https://www.cheapcycleparts.com/oemp...e030f/cylinder

You should be able to hone or bore the cylinders and put the appropriate size piston and rings in it.
That makes sense with the diagram. I assumed they were based on part pictures. I'm trying to avoid boring because I s expensive compared to buying used parts.
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post #6 of 7 Old 06-20-2019, 10:51 PM
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If the cylinders aren't scored, all it should take is honing, and you can do that yourself. Look on Youtube if you don't know how. Most autoparts stores loan hones.

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
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post #7 of 7 Old 06-21-2019, 02:16 PM Thread Starter
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Quote:
Originally Posted by flitecontrol View Post
If the cylinders aren't scored, all it should take is honing, and you can do that yourself. Look on Youtube if you don't know how. Most autoparts stores loan hones.
Fingers crossed. Gaskets came in today. Clutch, fork seals/oil, tires, brakes and all the other bits are on the way. I'm very excited to get past this nasty part of the rebuild and onto the less detectivy parts.
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