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The only problem I see with this exhaust is mounting an external o2 sensor, probably the main reason I have not purchase a wide band yet. Not to many locations to weld a bung and it to nice to even do so. I may just get a AFR+ o2 adapter to try out.
 

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Discussion Starter · #84 ·
do you have to remove this system to access the oil drain bolt?
You have to remove the muffler portion which is easy it is one bolt and a spring. Takes an extra 5 mins.
 

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It's a great exhaust.
 
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It's really a sweet looking exhaust, I considered one but figured I'd bash it on something and feel terrible. After riding a good bit and not having clearance problems, I kinda wish I had gotten it..
 

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So, can someone give me dB meter readings from a phone app? I would like to know with the phone at where your head would be on the bike at idle and 3500rpm and 5k rpm. I can interpolate the rest. Let me know what app you use. I want to compare to stock. I REALLY like this exhaust and am willing to shell out the money if the dB's are low enough. Thanks guys!
 

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Got this nice exhaust yesterday, but I am thinking it could need some mods?
There is some kind of spark arrestor or db killer in the inlet of the muffler. This just has to be removed in some way?
And in the outlet of the muffler there is a restrictor too. What to dooo?

Also the outlet pipe is angled a bit upwards instead of straight or a bit downwards, but I guess this is not a big problem. But it could perhaps accumulate water.
 

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So fellows, what are we gonna do about a WBO2?? I'm considering the dobeck o2 adapter. Can't/won't weld on the titanium. What to dooo?
 

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No problem opening the muffler, only aluminium rivets.
No need to open the inlet end of the muffler.
Just opened and inspected the outlet end.
Drilled out the strainer in the inlet end using a 40 mm bimetal hole saw.



IMG_2363.JPG IMG_2366.JPG
 

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Fuckin ballsy! Got it back together yet? Any difference?
 

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Thanks Teerex! I've had the opportunity to work with the AFR Plus system, providing feedback to Dobeck for what worked and what didn't work. I ended up buying a new O2 sensor before sending the system back because the location with the adapter contaminated the sensitive elements within the O2 sensor which affects sensor accuracy and overall lifespan. It may look like it works in the beginning, but when it's really "ridden" after the break in period, weird things can happen. Don't be afraid to get the bung welded on, just find a reputable welding\machine shop, ask them to use the current welds as a guide to what kind of work you expect, and don't worry about the payment. You get what you pay for if you know what expectations to set. If they cannot do it, go to another shop. Our Grom hobby is an investment, you already took the plunge by getting an exotic exhaust, therefore if you can't do it right now, wait and save....you'll be glad you did ;)
 

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I am getting my new red MSX 125 on friday, så I have no idea how it is riding this thing


By the way, when I riveted the end cap back I rotated it 180 degrees so now the outlet points to the left and a bit downwards, instead of to the right and slightly upwards.
Every mod counts :single_eye:

Why is the post empty when I try to edit it ?
 

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Absolutely love this exhaust !

Louder than stock so you can enjoy its sound but half as loud as most other exhaust I have listen to for the Grom.

Quality of construction is excellent.
20150424_194807.jpg 20150423_174156.jpg 20150423_174132.jpg
 

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I will never know what this exhaust sounded like "stock" since I drilled out the strainer before installing (I am installing it this weekend).
If you drill it out too and report if any difference... :tennis:
 

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Refrain from slamming down hard wheelies with this exhaust, just before the front wheels touch down rip on the throttle so its nice and gentle.
Ok maybe just don't do wheelies its illegal and dangerous lol.
 

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The sound is really awesome, had the first Yamamoto ride today (no "strainer"). Not too loud but not silent at all.
Exhaust hits rear tire a bit, because I turned the muffler end cap 180 degrees...

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