125cc motorbike tuning questions

[FMJ]

There are 144 kits from Power Roll etc. that bump the hp. You can also put 185 cylinder/head on them, but the cases need hogging. Check the TL 125 forums. There's lots of guys doing mods to them to get a bit more grunt out of them.

 

[jamabikes]

i would suggest a tiny air filter, used to use vent filter on my 125, and shed as much weight off the bike as poss.

 

[orange71]

thanks all round. Have to keep it 125 to be legal (on L-plates). Air filter sounds good. May ditch rear foot pegs and mounts (can't use them till I have full license.)

@ Saltyman - Vanvan or Tw125 are good bikes, but they struggle to get above 50mph from what I hear and the thought of a 130 mile trip on one sounds a bit daunting. Quite a low riding position too.

You wouldn't go far wrong with one like mine to be fair if you can find one. They're not very common. What's your budget? Mine cost £600 with 17k on the clock. Good high riding position, looks good, will do 65mph (and a bit more I'm hoping with some legal mods ), 120mpg if ridden carefully.

 

[saltyman]

That's perfect!

 

[jamabikes]

yep get rid of all the toot and drop a tooth or two of the rear sprocket. assuming the air box is under the seat, take out the stock filter and just sling a bit of foam (any old k&n panel filter off the bay) over the air intake and drill the air box till it looks like swiss cheese. makes a much nicer sound like this too.

 

[greenstiles]

road tires not semi ones..........less drag

oh to previous chap CG125's are great if you don't live in a hilly area. I had a blue 900 hornet and a blue CG 125...........i could wang the CG round tight (downhill ! ) corners faster than the 900 ! very good handling 125 and will pull 2 people( lor shopping, luggage) comfortably and will still handle ok JUST don't expect to go up hill fast !

 

[orange71]

to find out the sprocket size on the front (it's dark and I can't see it at the moment) which of these figures do I look at? Is it the final reduction which is telling me it's a 50 tooth on the back and 17 on the front?

 

[jamabikes]

not sure but 17 on the front sounds big. sure my old 125 (same engine) was an 14 that i swapped for a 13 for a bit better acceleration.

 

[orange71]

hmmm. Again without checking the actual bike (it's still dark ), when looking on ebay the only matches for clr125 (and xlr125 - same engine) seem to be 17t. e.g. http://www.ebay.co.uk/itm/280685978374? ... 1438.l2649 (Odd ebay seller that does both sprockets and lingerie I thought :shock: )

Unless someone can find different?

 

[big.eck]

one of my mates tried to tune his cg125 a few years ago but gave up after a couple of days , without putting a lot of time & money into it theres not a lot you can do it as theres no one out there who sells off the shelf parts for them


i had a yamaha dt125 a few years ago and put a dep/fresco exhaust and a set of race reed valves in it and it went like stink :shock: the same engine can be found in the tzr125

i'd have another dt125 in a heart beat