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Bought my first cg125

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SeeGee125
Derestricted Danger



Joined: 07 Apr 2015
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PostPosted: 22:42 - 07 Apr 2015    Post subject: Bought my first cg125 Reply with quote
Hi guys, new to forum and also owning a cg125, went out today for first time, and to my surprise 1st and 2nd gear seemed to go forever, then third but then when in fourth the rpm starts to die and 5th is more or less death for the engine, only reaching 50mph flat out in 4th even though revs wouldn't peak, wot you think the problem maybe.

Cheers
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CBF600SA
L Plate Warrior



Joined: 14 Dec 2014
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PostPosted: 22:47 - 07 Apr 2015    Post subject: Reply with quote
You need to go on a diet! Very Happy
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mudcow007
World Chat Champion



Joined: 01 Feb 2012
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PostPosted: 23:20 - 07 Apr 2015    Post subject: Reply with quote
My CG wouldnt go past 50 either, granted im 17stone but still.....
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DRZ4Hunned
World Chat Champion



Joined: 15 Apr 2014
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PostPosted: 23:25 - 07 Apr 2015    Post subject: Reply with quote
Are the brakes dragging?
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DRZ400-SM
FZS600
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SeeGee125
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Joined: 07 Apr 2015
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PostPosted: 00:13 - 08 Apr 2015    Post subject: Reply with quote
I'm only 14 stone wet through, my c90 goes faster, not had a proper look yet at brakes etc but will do at the wkend, just thought it woukd piss on my c90, but not at the mo, cheers guys
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Mysteriass
Nova Slayer



Joined: 06 Apr 2015
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PostPosted: 02:40 - 08 Apr 2015    Post subject: Reply with quote
Couple of things that might be worth checking...

* Air Filter
* Spark Plug / Replace / Correct / Check Gap / Check Mixture
* Coil, Spark Plug Cap & HT Lead Integrity ?
* Clean Carb Focusing on Main Jet
* Carb Settings
* Clogged Fuel Tap Filter / Fuel Pipe
* Fresh Fuel ?
* Binding Brakes ?
* Tyre Pressures ?
* Clogged Inline Fuel Filter (If it exists) ?
* Points ?
* Weeping Gaskets / Exhaust Gasket ?
* Blocked Exhaust ?
* Coke Buildup In Cylinder Head / Piston / Exhaust Port ?
* F*cked Up Front/Rear Sprocket Ratio ?
* Overheating ?
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smallfrowne
Scooby Slapper



Joined: 25 Jun 2014
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PostPosted: 08:53 - 08 Apr 2015    Post subject: Reply with quote
That's a good list to be going on with, don't think I can add anything to that! I'd check the sprockets first off as you only have to look at em.. Which I think for '85 onwards should be 14 front, 41 rear, and pre '85 is 15/34. Should also have an 18" rear tyre on for post '85 and a 17" rear for pre 85' - might skew the ratios evvvver so slightly Very Happy

Just rebuilt mine, and it's a bit of a mongrel but can get ~63mph in 5th, and a bit more down a hill Very Happy
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Mark65
World Chat Champion



Joined: 16 May 2008
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PostPosted: 09:55 - 08 Apr 2015    Post subject: Reply with quote
I can get 65 on the clock on the flat, I put a 15t on the front as I have mainly flat riding and it stops the engine from screaming at 50 and above, I ride mostly around 40mph.
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07 Yamaha YBR125, 07 Honda CG125 , 15 CBR300R (Chocolate Crank, Deaded), 16 CB500FA, 19 Honda Forza 300, 70 Suzuki SV650
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SeeGee125
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Joined: 07 Apr 2015
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PostPosted: 17:36 - 08 Apr 2015    Post subject: Reply with quote
Wow wot a list lol, thanks for pointing out the things to check, it will be a great help, I did notice the exhaust was blowing out of where it fastens to the head, could this dampen the performance at all?
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Tamsin
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Joined: 07 Mar 2014
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PostPosted: 18:09 - 08 Apr 2015    Post subject: Reply with quote
What year is the bike?
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Commuter_Tim
World Chat Champion



Joined: 09 May 2013
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PostPosted: 19:12 - 08 Apr 2015    Post subject: Reply with quote
SeeGee125 wrote:
I did notice the exhaust was blowing out of where it fastens to the head, could this dampen the performance at all?


Yes, buy a new copper gasket from www.wemoto.com (usually about £1.50).

Exhaust removal on a CG is a very simple job, just 4 bolts typically.
Remove the old gasket, plop in new one, put exhaust back on, see if blowing has gone.
It's a crush washer/gasket so realistically every time you take it off you should change the gasket.

It's possible the exhaust blowing could be more significant damage but with any luck an idiotic previous owner or mechanic just forgot to put a new one on, or even just forgot to put one in all together.
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The above post is most likely nonsensical.

I ride a Bandit 600... badly.
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Mysteriass
Nova Slayer



Joined: 06 Apr 2015
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PostPosted: 19:56 - 08 Apr 2015    Post subject: Reply with quote
Quote:
I did notice the exhaust was blowing out of where it fastens to the head, could this dampen the performance at all?


Blowing downpipe could be the problem...

Wrap a couple winds of aluminum adhesive tape around it for now and see if it improves things : https://www.ebay.co.uk/itm/141440388433
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hondakawasaki
Nova Slayer



Joined: 03 Jan 2013
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PostPosted: 23:29 - 08 Apr 2015    Post subject: Reply with quote
ive owned my cg for over 3 years now Thumbs Up

done around 10k since ive had it, hasn't let me down yet

can manage 55mph screaming it in 4th 67mph in 5th on a flat with no wind i can do 73mph down a hill it will no go any faster Rolling Eyes

although 5th gear is pretty useless with the wind blowing at me Thumbs Down

happy riding Very Happy
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Old Thread Alert!

The last post was made 11 years, 196 days ago. Instead of replying here, would creating a new thread be more useful?
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