Project: Grom 2.0

[Jim]

Goodbye Grom charcoal canister. Keeping the bracket mounted to use for all the aRacer wiring that will go there.




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[Jim]

CBR300 motor is ready.




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[Jim]

Here is the adapter bracket to bolt the 250/300 motors into the Grom frame.




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[xrocket21]

Bolt in!!!!

[obsolete]

What do those motors put out?

[RandyO]

What do those motors put out?

from wiki

Power 30.4 hp (22.7 kW) @ 8,500 rpm (claimed).[23]
Torque 20 lb⋅ft (27 N⋅m) @ 7,250 rpm (claimed)[23]

[Jim]

CBR300 motor bolted in and torqued.

I used Grom torque specs (45 N-m) for the bracket to the Grom frame, and CBR torque specs (33 N-m) for the motor to the bracket.




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[OneCheekRider]

this is rad! Excited to continue seeing updates and get your thoughts on everything when complete!

[Jim]

that top motor mount bolt took two nights, and finally 2 neighbors to get it through.
tomorrow i'll get the throttle bodies done and maybe some of the plug-n-play connectors

[RandyO]

I can't use all of the 19hp I have in my K-Pipe, I can't comprehend 30hp in a Grom

[Jim]

I can't use all of the 19hp I have in my K-Pipe, I can't comprehend 30hp in a Grom

there's people on the swap group that punch their 300 out to 357, port and polish the TB's and get upwards of 40hp+

[xrocket21]

there's people on the swap group that punch their 300 out to 357, port and polish the TB's and get upwards of 40hp+

But will it wheelie?

[Jim]

But will it wheelie?

i'm curious what this 300 will feel as my high compression 181 Grom power wheelies in 1st gear with me sitting down.
the 300's have a really bad flat spot mid range that the aRacer does fix over time.

[obsolete]

But will it wheelie?

Will it not wheelie I feel is a better question.

[Jim]

Throttle bodies and radiator connected in.
Struggling in both.

Radiator has that one bolt for its mounting point. Also the horn bracket keeps hitting the radiator and I can’t turn the bike fully on either side.

Throttle bodies are all pieced and connected together but I couldn’t use a return cable. The Grom and CBR cable was too short. Not happy with the way it’s routed but i haven’t found a better way. The spring is at the bottom and it’s an awkward angle for the cables.




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[Jim]

Got the exhaust mocked up as well. It doesn’t connect directly to the can which is a huge disappointment. Also super far away for an under tail bracket.

There’s no brackets to secure the pipe so I see this being an issue later as well.

Also couldn’t remove the exhaust gasket in the motor. I have a new one, but might have to leave the old one in there.




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[loudbeard]

Jimmy, check out Venhill for the throttle cables. I linked their part finder, you can search by bike. When you get to the specific product, there’s a checkbox at the bottom to add additional length.

Degsy just ordered from them and it was delivered a few days after ordering, very good quality.