Performance Cam

LOLitsPOOP

New Member
Hi All

For a couple of months now I have been on the search for a performance cam for the 125/150 Ace.

After some failed attempts sourcing out of China, I finally had success out of Brazil. For those that aren't aware, there is quite an aftermarket scene for the CG125 based bikes in Brazil.

There are a few main players for cams with "WGK Ressalto" being the tamer of the group and "Vini" and "Ferzza" brands the more wilder ones. By tame, the WGK offers 292 degree duration with no additional lift. The others on the other hand offer up to +2mm additional lift and durations up to 330 degrees.

The standard cam in the Ace has 210 degrees duration.

Heaps of research and Portuguese translation later I narrowed down my choices and took a punt on the Ressalto. (P/N WGK1010851)





Sorry for the crap pic but it shows the difference in profile. Standard on the left, WGK on the right. The WGK has much steeper ramps and a broader nose. Big duration and overlap.

Cam is now installed. The bike starts fine and idles well with a slight fast idle. Motor is a little more rattley in the top. Exhaust has gotten louder. Driveablilty hasn't suffered at all and is still very tractable. It has lost a little bit of mid-range grunt but top end is much much better. Before my bike had a nice fat midrange and then became asthmatic as it revved out but now it has a willingness to keep revving and make power.

I am hearing the same feedback from another rider that I did this joint experiment with.

All in all, a worthy upgrade in my books. Very happy!
 

orrible-64

Member
Great choice for a street able cam . A big thank you for including me in your experiment .


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DohcBikes

Fuck You.
Good work, thank you for the research.

Quite a jump in duration and ramp profile there, I would like to see the results of a p/n that has a little less duration than your cam but a little more lift than stock.

Valve spring rates can be measured and more importantly compared with a decent bathroom scale and a drill press.
 

orrible-64

Member
Thanks for the tip on that. Wanted to see if cg 250 springs were stiffer. Cheers


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DohcBikes

Fuck You.
orrible-64 said:
Thanks for the tip on that. Wanted to see if cg 250 springs were stiffer. Cheers


Sent from my iPhone using Tapatalk
no problem. Just find a measuring tool that can show you when you have pressed in the spring one inch. If you have single rate springs that number will be close to your spring rate. If you have progressive springs, measure in increments. You can also measure coil bind with your drill press.
 

LOLitsPOOP

New Member
To those wanting to do their own investigation, here are some helpful Portuguese keywords.

Cg125 = Cg125
Camshaft = Comando de valvulas
Duration = Graus
Lift = Levante

Turn on Google translate and have fun translating dodgy translation LOL

What ever you find, make sure it has the same shaft bore size (14mm IIRC) and has a circlip groove for fitment to our cam gear.

If you do buy make sure you do registered post as the regular post doest have a great reputation.
 

2b

New Member
Thanks for sharing the outcome. It is great to have a trail blazer!

I see you got WGK1010851 and that has given more top end and slightly less mid, without having to change springs etc. Sounds like a good move for regular use.

Any thoughts on what other cams may be interesting to try, what they may deliver and whether other changes would be needed to make them work.?
 

LOLitsPOOP

New Member
I didnt get a wilder cam because we cant reliably get more revs out of the 156fmi motor.

I dont have a tacho nor run my bike on a dyno so orrible-64 has been a valuable co-test mule. And with his guidance i know we can reliably get 11k - 11.5k. Plus the fact that he's been toying with home ground cams for some time.

With the standard cam I got to a state of tune where I could run the bike off the clock in top gear with 15/34 gearing.

The end result... valve bounce... bent push rods and damaged rocker gear.

I now have custom heavy duty chromoly pushrods and replaced the rocker gear with something of more substantial design.

Without heavy duty valve springs (my next project) I wont go further as the next over rev could end up its last.
 

orrible-64

Member
I have run 17/34 gears successfully and if I could get higher gearing it could be worth a try. May have to try and see if primary ratio from a cg250 including better clutch will fit. Not holding my breath on that though as cg 250 head does not fit


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Racing Ruben

New Member
Hey guys
I've been pretty busy this past winter. I got a few things done with some help from a friend. We got some better compression with the big valve head ( I was driving the big bore kit with the 125head) , the porting is done, got some new valves in and removed every trace of the electric starter engine.
Now I would like to try a better camshaft. I've been looking at some Brazilian sites. I would like to try the wgk 1010851.
From wich website did you order this cam, because most of them seem to send their parts only to Brazilian adresses
thanks guys

Ruben
 

Attachments

Racing Ruben

New Member
Hey guys
I got some good news for all the ace owners who are interested in some better camshafts. I searched the internet for a long time to find a better camshaft but all I found was brazilian sites who would only send them to brazilian adresses. So I contacted Douglas Ernani de Carvalho from WGK INDUSTRIAS. They were very helpfull. He personally send me the wgk 1010851 camshaft to Belgium. The part together with the freight cost me arround 90€. The part alone is 20€. I'm very grateful to Mr Carvalho. Not every company would take the effort. He would be glad to help the guys on this forum. So mail him if you are looking for a better camshaft.
douglasernani@hotmail.com

Ruben
 
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