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 RC test mule 
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Post Re: RC test mule
CHRIS !! You gotta educate these guys -and- get us a huge MAGNET on this !!
I like it.
I'd like it better if it had a magnet.
ZUMIKE wrote:
oh that's the oil screen bolt
that already comes with some sort of heatsink fins

I thought it was the drain bolt

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Wed Feb 27, 2013 6:35 pm
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Post Re: RC test mule
BioMedHMC wrote:
CHRIS !! You gotta educate these guys -and- get us a huge MAGNET on this !!
I like it.
I'd like it better if it had a magnet.
ZUMIKE wrote:
oh that's the oil screen bolt
that already comes with some sort of heatsink fins

I thought it was the drain bolt


i did mention about a magnet............... nothing happened.

i just need a small NEO-Magnet and i will just JB weld it in.

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Wed Mar 20, 2013 12:05 am
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Post Re: RC test mule
i was fortunate to test a takegawa roller cam kit last year.

easy to install and setup.

on 1st start up you can tell by the way it idles it's different from my RC street/race hi-lift cam. idle is smoother and throttle response is intant with a lot of bottom end torque. loved the cam for short trips around my area. the scooter would instantly jump and hit 35mph pretty quick. re-throttle was pretty quick and snappy, instant response. only con was midrange to top speed. it would lose steam once u get pass 35mph and feels pretty slow in the 50-60mph range and took forever to hit top speed (70mph). basically didn't have much power from 8,000-9,000rpm. re-tuned the cvt and messed with the forceworks with no luck.

i really wanted to degree the cam and put it on the dyno to see the HP/graph. unfortunately the roller rocker snapped when i was doing a test run. heard a loud metal pop and motor just shut off. i thought i put a hole in the piston or cracked it cuz that's what it sounded like. till this day i still don't know what caused it. it was a stock ported cylinder head with stock valves/springs. it's not bent and the valve lash was adjusted. it snapped off clean and instantly.


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Wed Mar 20, 2013 12:29 am
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Post Re: RC test mule
Race Concept wrote:
i was fortunate to test a takegawa roller cam kit last year.

are the roller rockers available by themselves?

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Wed Mar 20, 2013 5:42 am
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Post Re: RC test mule
Chris should be able to get you either Taida's version or Koso's. Both brands have a set.


Wed Mar 20, 2013 7:40 am
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Post Re: RC test mule
DerHahn wrote:
are the roller rockers available by themselves?


Seeing as the roller rockers happened to be the weakest link in this mod, it would be the furthest thing I'd consider installing. Takegawa is known for making some high quality parts, but if they failed to properly cast or reinforce the roller rockers, then I'd avoid going that route no matter who makes the part, unless a serious improvement in design/materials/manufacturing occurs.

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Wed Mar 20, 2013 8:34 am
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Post Re: RC test mule
JohnnyFYX wrote:
DerHahn wrote:
are the roller rockers available by themselves?


Seeing as the roller rockers happened to be the weakest link in this mod, it would be the furthest thing I'd consider installing. Takegawa is known for making some high quality parts, but if they failed to properly cast or reinforce the roller rockers, then I'd avoid going that route no matter who makes the part, unless a serious improvement in design/materials/manufacturing occurs.



just what I was thinking
sure its a cool part, but then it just snapped
and luckily caused no other damage


unless its a freak thing and there are hundreds of the same ones on the road with no problems

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Wed Mar 20, 2013 8:38 am
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Post Re: RC test mule
having worked as a machinist for years in the past, i know that there can always be some bad castings here and there. but i've always liked the roller rockers. even the stock engine could benefit from less engine resistance

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Wed Mar 20, 2013 8:40 am
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Post Re: RC test mule
Although i agree that Takagawa parts tend to be very high quality, those may have been a lemon, the loss of mid-high power is odd. but to be a stickler, i did say that Taida and Koso both have their own kits. So maybe the angle on theirs maybe different and not as much loss on the mid-high, who knows. i for one want to find out!

*note to self, buy roller rocker arms and matching cam shaft...


Wed Mar 20, 2013 8:50 am
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Post Re: RC test mule
DerHahn wrote:
Race Concept wrote:
i was fortunate to test a takegawa roller cam kit last year.

are the roller rockers available by themselves?


it's a kit, roller rocker arm with matching camshaft.

some of takegawa parts are made in taiwan. u can say this is the 1st generation since it has been out for 2+ years. only recently other companies in taiwan is starting to introduce it.

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Wed Mar 20, 2013 10:04 am
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Post Re: RC test mule
Here's my 2 cents...
I'm nearly 100% sure that roller rockers require a different cam profile to work properly. A cam for use with roller rockers should have a more oval shape than the tear-drop shape of a standard tappet cam.

Anywho, I'll hold off the roller setup for the day my Zuma gets a 200cc or greater BBK.

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Fri Mar 22, 2013 12:13 pm
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Post Re: RC test mule
Race Concept wrote:
i was fortunate to test a takegawa roller cam kit last year.

easy to install and setup.

on 1st start up you can tell by the way it idles it's different from my RC street/race hi-lift cam. idle is smoother and throttle response is intant with a lot of bottom end torque. loved the cam for short trips around my area. the scooter would instantly jump and hit 35mph pretty quick. re-throttle was pretty quick and snappy, instant response. only con was midrange to top speed. it would lose steam once u get pass 35mph and feels pretty slow in the 50-60mph range and took forever to hit top speed (70mph). basically didn't have much power from 8,000-9,000rpm. re-tuned the cvt and messed with the forceworks with no luck.

i really wanted to degree the cam and put it on the dyno to see the HP/graph. unfortunately the roller rocker snapped when i was doing a test run. heard a loud metal pop and motor just shut off. i thought i put a hole in the piston or cracked it cuz that's what it sounded like. till this day i still don't know what caused it. it was a stock ported cylinder head with stock valves/springs. it's not bent and the valve lash was adjusted. it snapped off clean and instantly.


Another 2 cents...
Looks like (difficult to judge by the picture) the cam suffered some adhesion wear with offset load, then finally ending with galling and destruction. Does Takegawa offer springs to go with the cam? It also looks like the cam lobe closest to the larger bearing was also seeing some "float" of the rocker arm, as there is very little wear pattern between dwell and duration. Or possibly the cam had too much lift and was binding the spring.
A bad casting (as others have mentioned) can produce the same failure results if there was a micro fracture or casting seam close to or at the roller bosses.
Hopefully they will want it back for microscopic analysis and metallurgy to help find the root cause of the failure.

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Fri Mar 22, 2013 12:42 pm
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Post Re: RC test mule
ZillyScoot wrote:
Here's my 2 cents...
I'm nearly 100% sure that roller rockers require a different cam profile to work properly. A cam for use with roller rockers should have a more oval shape than the tear-drop shape of a standard tappet cam.

Anywho, I'll hold off the roller setup for the day my Zuma gets a 200cc or greater BBK.


roller rocker kits always come with a matching cam.

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Mon Mar 25, 2013 1:32 am
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Post Re: RC test mule
ZillyScoot wrote:
Race Concept wrote:
i was fortunate to test a takegawa roller cam kit last year.

easy to install and setup.

on 1st start up you can tell by the way it idles it's different from my RC street/race hi-lift cam. idle is smoother and throttle response is intant with a lot of bottom end torque. loved the cam for short trips around my area. the scooter would instantly jump and hit 35mph pretty quick. re-throttle was pretty quick and snappy, instant response. only con was midrange to top speed. it would lose steam once u get pass 35mph and feels pretty slow in the 50-60mph range and took forever to hit top speed (70mph). basically didn't have much power from 8,000-9,000rpm. re-tuned the cvt and messed with the forceworks with no luck.

i really wanted to degree the cam and put it on the dyno to see the HP/graph. unfortunately the roller rocker snapped when i was doing a test run. heard a loud metal pop and motor just shut off. i thought i put a hole in the piston or cracked it cuz that's what it sounded like. till this day i still don't know what caused it. it was a stock ported cylinder head with stock valves/springs. it's not bent and the valve lash was adjusted. it snapped off clean and instantly.


Another 2 cents...
Looks like (difficult to judge by the picture) the cam suffered some adhesion wear with offset load, then finally ending with galling and destruction. Does Takegawa offer springs to go with the cam? It also looks like the cam lobe closest to the larger bearing was also seeing some "float" of the rocker arm, as there is very little wear pattern between dwell and duration. Or possibly the cam had too much lift and was binding the spring.
A bad casting (as others have mentioned) can produce the same failure results if there was a micro fracture or casting seam close to or at the roller bosses.
Hopefully they will want it back for microscopic analysis and metallurgy to help find the root cause of the failure.


most of the damage and wear is from when the roller rocker arm cracked on one side and this caused the roller bearing to roll uneven on the cam lobes. then it just snapped off and motor shut down.

these kits are designed to work on the stock valve spring. yamaha valve springs can take some major abuse. as long as you don't go over the RPM limit or run some radical cams. too big of a cam won't work well on a fuel injected engine (unless u go stand alone ecu). radical cams is mainly for carburated engines.

however the spring could be old? i have to put it on a spring tension tester at my friends shop.

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Mon Mar 25, 2013 1:53 am
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Post Re: RC test mule
well the test mule is now in hawaii since i moved.

i am still always developing/testing to get the best bang for the buck for my kits. 155R has been upgraded several times and many of you actually have my 158R. reason i don't advertise it cuz the cylinder factory keeps running out of 59mm nikasil. but always abundant of 58.5mm cylinders. pistons is always in stock. so actually my 158R has been out for a good 4 years now. i would say 70% of the people who ordered got it.

my camshaft has gone through 3 changes now and the current one is the largest cam. only thing bigger is the roller cam kit. lift is about the same but roller is allowed little more duration so has better mid range torque. difference with the cam is the power band in midrange to top end. pulls way harder now and linear pull to top speed. just keeps on going!

so if you was to take my more recent 155R bbk vs a older one that's 4-7 years old. the newer one would pull away and have better speed. that has already been verified by customers. then his buddy who lost went and upgraded to the roller cam kit and beat him back lol. unfortunately the roller cam kit is not for everyone since you need to change the valve spring. the kit comes with matching stiffer springs. need special tools to change it. but if customers sends me their cylinder head i can do it for them if they bought the kit from me. or purchase my V1 high flow head same time and i can install it. this makes it a more bolt on setup.

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Thu Jan 04, 2018 4:52 am
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