Honda Rebel CA 125 engine repair - Honda Rebel Forum
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post #1 of 33 Old 07-05-2015, 08:04 AM Thread Starter
 
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Honda Rebel CA 125 engine repair

Hello.
I'm new here, my english is not my mother language, but, I hope I explain what I want to ask.
Few days ago, I bought a Honda Rebel CA125 for my daughter. When I saw it, the engine start but smoking and a lot of knock inside it. Turning back home, first I checked the valve clearance. I was very disappointed, the valve rocker with tappet knock like hammer, cca. 1.5mm space to each valve. Cam chain tensioner was soft, cam chain haven't tensioned properly. The right piston and barrel are very worn and I think I need to use 0.75mm repair kit, directly, to have the right condition for compression. Need new sparks... and a lot of work.
Good news are that the crankshaft seems to be good, other components seems to have good clearance.
Questions:
1) These bikes have or not oil filter?
2) These bikes have or not balance shaft? (I found on ebay: Honda Rebel CA125 Ausgleichswelle Balance Shaft | eBay)
3) Clutch friction plates standard/service thickness and clutch metal plates standard/service thickness?
4) There is a place where I could find a repair manual, in electronic format/files, for download? I have some fiches with parts from another site.
5) What other need to check for bad clearance to this engine.
Thank you.
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post #2 of 33 Old 07-05-2015, 08:45 AM
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Welcome. Your English is fine.

1. There is no oil filter. Frequent oil changes are recommended. Many members change their oil every 1,000 - 1,500 miles (1,600 - 2,400 km).
2. Not sure about the balance shaft. Go to the site with the parts fiches and see if you can find an identical part.
3. I can give you the information for the CMX250, which may or may not be the same. Clutch spring: 36mm. Friction plates: 2.5mm. The metal plates have a warpage limit of 0,20mm, no wear limit is given. If the clutch isn't slipping, I wouldn't worry about it. If it is slipping, replacing the friction plates and possibly the springs, is usually all that is needed.
4. Can't help you with a repair or service manual, but if you could post a link to the site with the parts fiche, it would be helpful to others.
5. Check the valves. Make sure the stems are straight and they are seating properly. I'm sure others will mention things I haven't listed.

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

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
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post #3 of 33 Old 07-05-2015, 09:03 AM Thread Starter
 
Join Date: Jul 2015
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Hello.
Thank you for your rapid answer.
The fiches that I found are here: Honda Ca125 Rebel 1997 Germany / Kph parts list partsmanual partsfiche. That model is for mine, but I think that are compatibility. I never saw a balance shaft on these fiches, that's what I ask for. I don't know if clutch is slipping, I may seem that, oil bad or may be learned with my 86HP bike...
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post #4 of 33 Old 07-05-2015, 09:28 AM
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When the clutch begins to slip, it usually begins in the higher gears. The engine revolutions will remain high or increase, but the bike doesn't go faster. In North America, we have automotive oils that are energy conserving, meaning they contain slippery additives that help car engines obtain better fuel economy. These are all XW-30 oils, and if used in a motorcycle with a clutch that is bathed in engine oil, it will eventually cause the clutch to slip. So many of us use XW-40 oils, which do not contain the additives. I have never heard of such oils being used outside North America.

Since the "balance shaft" is not on the fiche, I would say it isn't needed and probably won't fit. Anyone can sell things on Ebay, whether they know what they are selling or not.

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 33 Old 07-05-2015, 10:35 AM
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Welcome to forum. The only rebel that has a balance sharft is the 450



2000 rebel 250 Aussie My Baby.
2012 honda PSX 150cc scooter [in Thailand]
1986 rebel Silver 450 Elvis

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post #6 of 33 Old 07-05-2015, 03:59 PM Thread Starter
 
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Thanks @flitecontrol and @wjmrty for your answers. Maybe the clutch didn't sleep, I change all five speed and seems to slipping or I'll be learned with my bike. Next days I'll dismantle the clutch to see the clutch plates, measuring its and post it here (friction and metal plates). Thank you.
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post #7 of 33 Old 07-05-2015, 05:34 PM
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You will need a new lock nut, part number 13 here: Honda Ca125 Rebel 1997 Germany / Kph Clutch - schematic partsfiche You will also need the special tool for removing and installing it, https://www.rockymountainatvmc.com/p...er?term=clutch and a tool to keep the clutch basket from turning when you tighten the nut. EBC Clutch Basket Removal Tool CT012SP for 03 08 Honda NXR150 Applications | eBay

Both these tools can be made if you have the material.

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 #8 of 33 Old 07-07-2015, 04:53 AM Thread Starter
 
Join Date: Jul 2015
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Hello.
Clutch friction plates are ok, I think. Its have 2.8 - 2.9mm thickness.
Another question: how often need to replace stem seal valve (intake and exhaust) or how can I verify it s if are damaged? Thank you.
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post #9 of 33 Old 07-07-2015, 08:16 AM
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The valves seals are replaced when there is a problem. If you begin to see light blue smoke in the exhaust after the engine is warm, and the spark plugs are oil fouled, it is either the valve seals or worn piston rings causing it. Do a dry and then wet compression check. Instructions are here, and post #4 explains how to tell if it is the piston rings or valve seals: http://www.hondarebelforum.com/f39/2...test-8443.html

An extremely low compression reading would tend to point to valves that are not seating properly. If you haven't already, check and set the valve clearance, and do it before doing the compression check. Here is a video on doing it on the 250: http://www.aboutdean.com/images/subj.../reb_valve.wmv And here is some good reading on the subject: http://www.hondarebelforum.com/f39/f...nt-2403-2.html

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
flitecontrol is online now  
post #10 of 33 Old 07-10-2015, 04:18 AM Thread Starter
 
Join Date: Jul 2015
Location: Alba, Romania
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Hello.
Yesterday I was trying to unmount, for cleaning, the oil pump. I didn't succeed, because the holder screws are locked. I destroyed, partialy, the head of one and stop work. These are monted with some lock substance, that retain its hard? There is a special tool for unmont these? I'm talking about the three cross head screws. May I use heat air gun? Thank you.
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