Takegawa Bomber exhaust on performance small blocks?

[theraymondguy]

Does anyone have first hand experience with a Takegawa Bomber?

Theres quite a collection of sound bites on youtube, but mostly in front of China 125s. I'm curious how the performance small block (88-117cc) crowd has made out with them.

• Flow
• Tone
• Longevity of finish

It sure seems like the most likely choice for an entry level 'designer' pipe - under $300, the right kind of shiny and what seems like good tone. It might not be as deep as I'd like, maybe you can fill in that blank.

Alternative suggestions are welcome too, but first hand input only please - add pricing too.

 

[theraymondguy]

It is really easy on the eyes...

 

[69ST]

Not exactly what you asked but...the actual exhaust tone will depend on the engine that happens to be exhaling through any given pipe. 88cc tunes usually don't sound much different than stock. Stepping-up to 110+ makes a huge difference, due to simple physics, i.e. the volume of air being moved at any given rpm. 108-117 tunes will have a pronounced thump at idle and a much more aggressive tone under WOT...while the same pipe will yield much mellower noises behind <90cc.

As for flow, displacement isn't what matters, it's horsepower. Any given hp requires the same amount of airflow.

 

[White]

Is this the one.... I did have it on my old skyteam dax.... Bought the bike for scratch.... th exhaust came with it. But noisy, the bike didn't seem to go faster ( about 54km/h yes OK 50CC).
The day I fitted a honda old style exhaust.... the dax cruised at 65km. So it rather did slow the bike down I guess....

 

[theraymondguy]

Not exactly what you asked but...the actual exhaust tone will depend on the engine that happens to be exhaling through any given pipe. 88cc tunes usually don't sound much different than stock. Stepping-up to 110+ makes a huge difference, due to simple physics, i.e. the volume of air being moved at any given rpm. 108-117 tunes will have a pronounced thump at idle and a much more aggressive tone under WOT...while the same pipe will yield much mellower noises behind <90cc.

As for flow, displacement isn't what matters, it's horsepower. Any given hp requires the same amount of airflow.

Good reading, Thanks Bob. I did want to isolate input from the 88 - 117 guys from the rest for this reason - however did not have the knowledge to expound why.

 

[theraymondguy]

Does that make your pipe... available White?

 

[69ST]

I'm somewhat surprised at White's experience, even though that was with a 49cc lump. Usually, the big tradeoff is at low-end/off-idle. Oversized headpipes kill scavenging...and with it, throttle response. And, I've tested a lot of loud pipes that didn't flow worth a . Straight-through exhausts...including those with oversized headpipes, typically do flow better, at the absolute peak, than anything with any real baffling. That said, even with 80mph power levels, the difference between the most obnoxiously ear-splitting, free-flowing, race pipe and an efficiently-tuned exhaust with just enough baffling to attenuate peak db to a level that won't draw attention from the black & white tax collectors, or cause permanent hearing loss can be as little as 1-2mph.

Thus, imo anyway, it comes down to the old, dreaded "fuzzy math"...where sound, throttle response, 2mph of absolute top end, aesthetics and, of course, cost are all factors. No pun intended, trying to science-out an exhaust choice can be headache fodder. :43:

Back to White's seemingly counterintutive results...I'd like to see what induction tuning would do with the straight-through pipe. Changing over to a free-flowing (especially what are oftentimes called "big bore") exhaust, will usually necessitate main jet changes & other tweakery to bring the air:fuel ratio back into balance. I'd guess that his 49cc motor was running lean at peak power. Still, I suspect that re-jetting alone wouldn't make up for a nearly 20% difference in top speed. I'd bet that this minuscule engine didn't exhale enough volume to work efficiently with this pipe. In other words, it really was too big for the application.

With double the displacement, I doubt you'll have that problem. If you do, it'll be to a much lesser degree.

 

[White]

@ theraymondguy: Sold the old pipe 3 years ago.... that bike toI sold in pieces.... no china bike in my garage anymore. I drive a ('74) ST-70 White now.