What's going on with the gears on my CM250? | GTAMotorcycle.com

What's going on with the gears on my CM250?

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dolphin browser

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Hi folks,

Okay so I recently bought a 84' Honda CM 250 as my very first bike. I have noticed something that has caught my attention, and I am wondering if this needs attention. When I gear down from 5th or 4th gear I hear this hollow-ish dumping noise. I don't exactly know how to describe it other than to say it sounds thick and hollow. It only does that when I am down shifting to 1st. As this is my first bike I don't know if this is normal. Please let me know if there's a reason to believe that something is wrong with the transmission?

Thanks!
 
dolphin browser said:
Hi folks,

Okay so I recently bought a 84' Honda CM 250 as my very first bike. I have noticed something that has caught my attention, and I am wondering if this needs attention. When I gear down from 5th or 4th gear I hear this hollow-ish dumping noise. I don't exactly know how to describe it other than to say it sounds thick and hollow. It only does that when I am down shifting to 1st. As this is my first bike I don't know if this is normal. Please let me know if there's a reason to believe that something is wrong with the transmission?

Thanks!
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Did you buy that sketchy bike that just about everyone told you to walk away from?
 
Are you shifting all the way down from 4th or 5th to 1st in one shot and complaining about the clunk into first?
 
GreyGhost said:
Are you shifting all the way down from 4th or 5th to 1st in one shot and complaining about the clunk into first?
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Not really complaining but yes it's a clunking noise as you described it. I was just wondering if that's somewhat normal. The bike isn't as sketchy as you'd think. IMO the seller was unable to present himself as well as the bike in a proper manner. It needs work, but it's actually not THAT bad of a working condition :)
 
I rode a 1984 CM-250 from 1984 until early this year, when I sold it. In 29 years, it needed only one significant repair, and it stood up very well to many winters in Toronto. Due to a flaw in its manufacture, the crankshaft broke ... that's right, it broke! Through a friend, I acquired a new crankshaft and installed it, with the essential help of my son. That was long ago, and the bike carried me to many places in Ontario and in Florida after that repair. (trailer between those places)

The transmission was always sound, and never gave me cause to complain. The CM-250 was my only bike for a few years. I often had to depend on it in really rotten weather, and it was reliable and faithful and economical to ride. I think you will like your bike, and spend very little money maintaining it.

Its current fate: I sold it to the friend who procured the crankshaft for me way back in 1990. I rode across Florida with him, and he rides it around Daytona and New Smyrna Beach a lot. It is still reliable, and he enjoys it a lot.
 
inspect clutch cable and adjust if clutch is not disengaging drive.

Could be as simple as that?
 
Salos Dafee said:
I rode a 1984 CM-250 from 1984 until early this year, when I sold it. In 29 years, it needed only one significant repair, and it stood up very well to many winters in Toronto. Due to a flaw in its manufacture, the crankshaft broke ... that's right, it broke! Through a friend, I acquired a new crankshaft and installed it, with the essential help of my son. That was long ago, and the bike carried me to many places in Ontario and in Florida after that repair. (trailer between those places)

The transmission was always sound, and never gave me cause to complain. The CM-250 was my only bike for a few years. I often had to depend on it in really rotten weather, and it was reliable and faithful and economical to ride. I think you will like your bike, and spend very little money maintaining it.

Its current fate: I sold it to the friend who procured the crankshaft for me way back in 1990. I rode across Florida with him, and he rides it around Daytona and New Smyrna Beach a lot. It is still reliable, and he enjoys it a lot.
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That's truly awesome. I'm more confident in my decision of buying this as my first bike. Was your bike a belt drive or a chain drive? This particular one I have used to be belt and was converted to chain by the previous owner. In terms of the gear issue. I still want to take to a mechanic and get it checked. The only reason Ivent yet is what if it ends up costing me $500+?

I just went on a drive and I noticed that the gears sometimes get stuck after third. Like I really have to forcefully push the lever up with my foot to get it to upshift from third to fourth. Also, I noticed that when shooting down at high speed (keeping the clutch in obviously) the gear goes to neutral makes a grinding noise until I downshift it again to take it to the first. This isn't normal right guys?
 
dolphin browser said:
Not yet. I'm taking it to Rosey Toes on Monday. Went to gp auto and bought a battery today. I did put in shell rotella 15/40 I think. But Ivent officially changed the oil yet.
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how did you put oil in the bike without changing it first? was it low?
 
matthew said:
and based on an early thread about the gears / clutch


http://www.gtamotorcycle.com/vbforu...CB250-owners&p=2065153&viewfull=1#post2065153
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Yeah I read this. But the seller knew very little about the bike, because he only had it for like 2 months before he sold it. I guess I'll only know for sure when I take it to a mechanic. In regards to the oil, I just put some in because it was on fact quite low. Please pardon my noob-ness. I'll become more experienced once I've had this bike for a little while. :)
 
Don't worry, Ted knows a lot about the older bikes, he'll let you know what's going on and check your clutch. If you ask, he's usually happy to show you how to adjust your chain, give you advice/pointers etc.
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