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Going back to OEM exhaust

This is a discussion on Going back to OEM exhaust within the Grom Talk forums, part of the Honda Grom Forums category; Im surprised one isnt available. Have you reached out to them? especially with that bracket failure, maybe they will just comp you one....

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Thread: Going back to OEM exhaust

  1. #11
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    m in sc's Avatar
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    Im surprised one isnt available. Have you reached out to them? especially with that bracket failure, maybe they will just comp you one.
    Too many toys? nah. 09 Ducati sport classic, 74 rd350 LC hybrid, 73 RD350, 73 Kawasaki S2a, 67 Kawasaki C2TR 120 Roadrunner, 71 Kawasaki G3SS powered by a CR85 liquid cooled lump, 74 Moto-Morini 3 1/2 strada, 84 Yamaha RZ350, 1962 Ford falcon, 76 Ford maverick, very early 1970 non-us Spec Yamaha R5, 89 Yamaha DT50 bought NEW in 2015, 2015 KTM 390 Duke, 72 yamaha CS5.. . oh.. and 2014 Honda Grom with lots of mods.. (some useful, most not)

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    Your PCV map would only be good for the open loop if you disconnect the wideband. No wideband and the stock ECU would be shooting for a 14.7 AFR in the closed loop. Get a new bung welded to the stock exhaust and let wideband continue to control your closed loop.
    2017 Grom
    Kitaco NEO 181 2V / Takegawa Oil Pump, Cam Chain Tensioner, Crank Support Kit & Catch Can
    DynoJet PCV, WB2 & AFR / OPMID 2 Temp / RPM Dual Gauge Mount
    Koso 34mm TB / Drow Sports CF Intake & Oil Cooler / Hindle Exhaust / Port Matched Head
    Kitaco Clutch Cover / SMR 6 Disc Clutch & 60% Springs / Chimera Clutch Plate
    Michelin PP SC2's / EBC Vee-Rotors & HH Pads / 15/32t & 420NZ3 Chain / SpeedoDRD
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    Oh wait you have a flashed ECU don't you, scratch my last post then...cause I don't know, lol.
    2017 Grom
    Kitaco NEO 181 2V / Takegawa Oil Pump, Cam Chain Tensioner, Crank Support Kit & Catch Can
    DynoJet PCV, WB2 & AFR / OPMID 2 Temp / RPM Dual Gauge Mount
    Koso 34mm TB / Drow Sports CF Intake & Oil Cooler / Hindle Exhaust / Port Matched Head
    Kitaco Clutch Cover / SMR 6 Disc Clutch & 60% Springs / Chimera Clutch Plate
    Michelin PP SC2's / EBC Vee-Rotors & HH Pads / 15/32t & 420NZ3 Chain / SpeedoDRD
    RacingBros Adj Fork Kit and Shicane HLR Shock / Vagabond Fender Eliminator
    Seat Concepts

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  5. #14
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    Quote Originally Posted by tooter View Post
    If you want to go back, I highly recommend this free stock exhaust mod.

    Attachment 79198

    Attachment 79200

    Attachment 79202

    This is how it sounds...



    The sound is just deeper and a tad bit louder than with the muffler. I'm not sure how much performance I gave up as the engine runs really good this way. The exhaust is also about one third lighter without that big heavy ugly muffler. It's all tucked away under the bike and nothing sticks out.
    I like this idea sound soft and not loud like my 2014 groms finbro full exhaust. The box under the grom is just the CAT system. If I do get a newer grom I will remember this video. Thanks for posting the sound video
    tooter likes this.

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    You could just get a metal strap to replace the broken mount.
    mikochu

    2018 Honda Grom (Matte Gray)
    Engine: DHM 186 | 2x ECU: DHM 186 & Stock + PV3 | Koso DB-03R w/ RaceDash | UEGO | MTake | DHM Header + Cheap Slip-on | Kitaco 60% Springs + Stock Plate | Superlite 16/32
    Suspension:
    RacingBros Front (7.5N/mm) / Rear (100N/mm)
    Chassis: Chimera Race Bolt | Speed Spacers | Womet-Tech Sliders | NDC Adjusters | TST Fender Eliminator | Steady Garage Flush Signals | ProTaper SE Honda Mini | Neverlandback Mirrors | Corbin Saddle | Driven TT Rearsets

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    Quote Originally Posted by kc4sox View Post
    When you get time would you mind posting a couple of pics of your exhaust ?
    Check out my build thread in the link below in my signature.

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    Quote Originally Posted by CiscoSanJose View Post
    I like this idea sound soft and not loud like my 2014 groms finbro full exhaust. The box under the grom is just the CAT system. If I do get a newer grom I will remember this video. Thanks for posting the sound video
    Yes, just the cat. It's amazing just how quiet it is. I don't know why Honda even put a muffler on it. (lol) I bet a new cat will fit on an old Grom, and I'll bet a lot of SF guys even throw their stock exhaust away! I'm making a proper tail pipe for it right now and am going to do some longer term testing just to see how the gas mileage compares to the TOCE. With the warmer weather the gas mileage has been getting really good, with a record high of 146 mpg and an average of 138 mpg.
    Last edited by tooter; 03-25-2019 at 11:39 PM.
    2018 GROM:
    TOCE Dual Exhaust
    TST Rear Fender Eliminator
    TST Taillight
    TST Front and Rear Signal Lights
    Dinger Built Extra Long Intake
    Honda Monkey Rear Sets
    Honda Monkey Front Fender
    Honda Black Plastics
    G Craft Rear Rack
    Cargo Crate

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    Quote Originally Posted by tooter View Post
    Yes, just the cat. It's amazing just how quiet it is. I don't know why Honda even put a muffler on it. (lol) I bet a new cat will fit on an old Grom, and I'll bet a lot of SF guys even throw their stock exhaust away! I'm making a proper tail pipe for it right now and am going to do some longer term testing just to see how the gas mileage compares to the TOCE. With the warmer weather the gas mileage has been getting really good, with a record high of 146 mpg and an average of 138 mpg.
    What I like to see on that setup is to remove the pipe from the exhaust port to the CAT and install a larger I/D pipe sort of what Finbro has for their set up just to help increase the flow of the exhaust to the CAT, or DIY a larger pipe and add a bung for future use.

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    You can put the stock muffler on and run a aftermarket header. I have seen some with and with out the o2 bung.

  11. #20
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    I have an SF
    2018 Grom:

    TB Parts 186bbk, DHM big valve ported head, TB Cam, Chimera intake, Two Brothers Tarmac exhaust, PCV / WB2, Seat Concepts, DRO Speedo healer, DID O ring chain, 16/34 gearing.

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