Project: Grom 2.0

[Kurlon]

i talked to AKFab about potentially making a liner damper mount for the lower triple. getting 90-100 MPH on 12" wheels does get sketchy.

Anyone making alternate clamps? My CRF70 on 12s was stable at 100mph, get enough trail in the front and the Grom should be too.

[Jim]

Reaching into my box of straps for the CBR300 to take home, I found the key I lost. Good thing the lock set was only $40 to replace.


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[Jim]

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[Jim]

CBR300 motor pulled off the donor bike last night. New spark plug installed. just waiting on the swap hardware.
from the videos on YouTube, the block off plate, throttle bodies elbow, and the throttle body mods need to be done before the motor can get bolted to the frame. there is no clearance to do some of these things once the motor is in the frame.

[xrocket21]

sounds like a nightmare for future maintenance!

[Jim]

sounds like a nightmare for future maintenance!

the only thing that sucks is the spark plug. the radiator for the swapped Groms covers the spark plug area, so you'll have to disconnect/move the radiator for spark plug changes.

[Sheppo]

the only thing that sucks is the spark plug. the radiator for the swapped Groms covers the spark plug area, so you'll have to disconnect/move the radiator for spark plug changes.

Its a 4-stroke and a Honda. How many spark plug changes are you expecting? Change the oil and the air filter and go

[xrocket21]

Its a 4-stroke and a Honda. How many spark plug changes are you expecting? Change the oil and the air filter and go

A friend sold a 7k mile Honda RC51, had just done an oil change. The guy paid big money for a "tune up" that included an oil change and new plugs.... 7k mile plugs lol

[Jim]

Its a 4-stroke and a Honda. How many spark plug changes are you expecting? Change the oil and the air filter and go

this motor i agree as it'll be pretty much all stock. i put a fresh plug in last night when the motor was on the workbench. it will have a cone style intake as there is no room for an air box on the Grom frame.

my red Grom has a high compression motor, so that would want plugs changed more often than the stock 300 swapped Grom.

[xrocket21]

this motor i agree as it'll be pretty much all stock. i put a fresh plug in last night when the motor was on the workbench. it will have a cone style intake as there is no room for an air box on the Grom frame.

my red Grom has a high compression motor, so that would want plugs changed more often than the stock 300 swapped Grom.

so what, like every 20k miles? lol

[Jim]

so what, like every 20k miles? lol

the red one would need a new piston and rebuild at 10k i'm told.
the swap one, that plug will last the lifetime of my ownership with it

[Jim]

Not required, but highly recommended. OEM Honda clutch cable, extended for the swapped motors. If you use your OEM a Grom clutch cable, it’ll fit very tight and no adjustments.





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[Jim]

Knock off plate installed on the 300 motor.




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[FriskyDingo]

Nice progress, what your best case first ride / completion date?? Assuming no parts hold up...

[Jim]

Adapter for the Koso dash. This has been powdercoated to look OEM.

This bracket allows you to use OEM fairings for the Koso dash.




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[Jim]

Nice progress, what your best case first ride / completion date?? Assuming no parts hold up...

All I’m waiting for is the bracket to bolt the motor to the frame. I should have it done this week if that arrives soon.

Today I’ll be prepping the throttle bodies, cleaning the fuel injector, installing the TB elbow, and cleaning up the motor.


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[Jim]

ABS delete for the electronics. Other hardware was already removed.




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[Jim]

Put some clear silicone on the back of the dash to hold it better to that adapter plate, but it’s all installed again.




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[Jim]

Replaced the OEM rear brake line with a new Galfer stainless line.




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[SRTie4k]

I'm shocked 8hp can get you to 60.

Barely. My Grom would do 60mph on completely flat ground or a downhill. Once you hit even the slightest incline, it would instantly drop to ~45-ish.

It's not a wonderful bike for anywhere outside of cities unless you love toodling around only on secondary roads.

[Jim]

Cleaned the 300 injector with my makeshift kit, using an old injector connector from my wrecked GSXR harness. Throttle bodies had a lot of build up, so that’s all cleaned up now too.




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[Jim]

Manual idle adjuster added. This is required for the swaps as the OEM idle will rev high at stops.

Fuel injector relocated to the 3D printed elbow (installed on motor). The black piece on the throttle bodies is a 3D printed plug for the OEM location for the injector.

Remember to lube the o-ring with motor oil before reinstalling your injector.




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[xrocket21]

Cleaned the 300 injector with my makeshift kit, using an old injector connector from my wrecked GSXR harness. Throttle bodies had a lot of build up, so that’s all cleaned up now too.




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Wait, what? You cleaned the injector how?

[Jim]

I clean all my injectors annually. The box is in the photo.


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[Jim]

Got the mileage on the CBR dash last night from a fellow rider on the Grom groups. Sprockets are OEM and numbers match. So this is 100% the motor’s miles.




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