Project: Grom 2.0

[Jim]

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




Sent from my iPhone using Tapatalk

[Jim]

CBR300 motor is ready.




Sent from my iPhone using Tapatalk

[Jim]

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




Sent from my iPhone using Tapatalk

[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.




Sent from my iPhone using Tapatalk

[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.




Sent from my iPhone using Tapatalk

[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.




Sent from my iPhone using Tapatalk

[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.

[Jim]

Once I get the header to fit in the motor, the bike can start. Having clearance issues getting around the frame. Will also need to order a different muffler that’ll fit.

OEM wiring done. Radiator installed. No return cable for the throttle bodies, but I’m told an OG Grom return cable will fit. Need to wire the auto tuner.

Also got the wrong front sprocket. Ordered Grom by mistake and needed CBR.


Sent from my iPhone using Tapatalk

[Jim]

New tires arrived from Michelin




Sent from my iPhone using Tapatalk

[Jim]

Secured the coolant overflow. Ran the bottle to the other side of the bike and ran an overflow line by the rear shock




Sent from my iPhone using Tapatalk

[Jim]

Installed the wiring for the fan. There a a copper insert that goes in between a radiator fin with thermal paste. That reads the temp. When it hits 190 F, the fan turns on.




Sent from my iPhone using Tapatalk

[Jim]

So the Grom SF return cable won’t reach the throttle bodies. I hear the OG model has just enough reach to work. Might just wait for a Motion Pro kit anyways




Sent from my iPhone using Tapatalk

[Jim]

Bled the brake lines today. I never did anything after removing ABS and installing new lines. So they were both done with fresh Motul RBF600.

Also was able to start the bike and mock up the exhaust and auto tuner.

The map is still using the wrong bike and the auto tuner has no power. So that’s on the next list of things to do.

The bike does start now.


Sent from my iPhone using Tapatalk

[Jim]

Ordered a universal air filter for the crankcase breather


Sent from my iPhone using Tapatalk

[Jim]

got all the aRacer wiring fixed. i didnt have the autotuner (AF1) plugged in. so now i'm getting air fuel ratio readings on the app when the bike is running.

few big items left:
- get a Grom map base (waiting on laptop cable to update the ECU)
- install the header

waiting on some items in the mail
- Bosch O2 sensor (for autotuner)
- CBR300 front sprocket
- crankcase breather filter

after that i'll have
- bend the foot brake lever to clear the engine case cover
- install the chain
- trim front plastic to clear the radiator
- install OEM plastics
- install aftermarket side fairings

still undecided on what to do with the throttle cables as i dont have a return cable, but also want to switch to a Motion Pro Rev3 kit.
also want to upgrade the master to a Brembo RCS14

i have fresh Michelin tires at home waiting to get installed.