Grom build

**Jim** · 09-13-23, 05:10 PM

Originally Posted by Kurlon

At the wheel, on a reputable dyno? I'm really curious, I was around for the early 220cc+ Honda Wave platform motors with similar claims and actual dyno numbers ended up coming back much lower. 16hp is enough to push that grom to triple digits so I wouldn't be upset by it if that was the number. 25hp at the wheel from 180cc, 2v aircooled single without it being a grenade is... well, I'm going to be very impressed if it pans out.

there are 2 reputable Grom builders on the east coast. the one i went with, i was his 68th 2v 181NEO kit and he had 2 waiting after me. they both work with a dyno tuner in FL that only works on mini bikes that came from specific shops. i'd say it's pretty accurate that i'll be around 24hp. if you read up the 2v 181 NEO kits, you'll see that they get 21+ horsepower. the 4v 181 NEO's will get close to 30hp.

**RandyO** · 09-13-23, 08:25 PM

I'm told the ZS190 in my K-Pipe puts out 17hp and I'm scared to use it all, I'm on 17" wheels, and about 65-70 is where fright takes over, I scooted up to 75 once, but I started to tremble and backed right down to 60, I cannot imagine going speeds approaching triple digits on 12" wheels

but I'm a huge barn door with limited range of motion

**Kurlon** · 09-13-23, 08:46 PM

It's not the size of the tires, it's the geometry of the setup that makes the difference.

**OreoGaborio** · 09-20-23, 07:52 AM

Pana-grom-le

https://reddit.com/r/motorcycles/s/8HvOmVbxFH

**Jim** · 09-20-23, 08:03 AM

Originally Posted by OreoGaborio

Pana-grom-le

https://reddit.com/r/motorcycles/s/8HvOmVbxFH

unless there was a 2nd one made, the bike blew up almost right after it was built.
that pic is a 2014-2016 model, so i'm thinking it might be the same one

**OreoGaborio** · 09-20-23, 08:31 AM

It couldn't use all that power.

**Jim** · 09-20-23, 11:22 AM

that Grom race was a ton of fun. pics just came in

now the unfun part was flying back to the pits to move the transponder onto the GSXR, take the warmers off, and go right back out for back-to-back races with something of slightly higher horsepower. took a lap or two to relearn how to ride it.

**Stoneman** · 09-20-23, 11:25 AM

Originally Posted by OreoGaborio

Pana-grom-le

https://reddit.com/r/motorcycles/s/8HvOmVbxFH

I love the comments...

**FriskyDingo** · 09-20-23, 11:42 AM

Originally Posted by OreoGaborio

Pana-grom-le

https://reddit.com/r/motorcycles/s/8HvOmVbxFH

WTF is the deal with the handlebars?!? look slightly less comfortable than ape hangers....internally rotates wrists...

**OreoGaborio** · 09-20-23, 11:56 AM

They're meant for an infant's short arms.

Or maybe a T rex.

**Jim** · 10-17-23, 09:17 AM

at the dyno today in Orlando. this shop specializes in Grom tuning

**xrocket21** · 10-17-23, 10:05 AM

Originally Posted by Jim

at the dyno today in Orlando. this shop specializes in Grom tuning

good luck!

**feralchimp** · 10-18-23, 11:36 AM

Originally Posted by Stoneman

I love the comments...

**Jim** · 10-24-23, 10:07 AM

Bought a CBR250 kickstand, cut off the feeler, and new powder coating. Can see in the left the CBR kickstand is more upright and helps the Grom from leaning over too much. When adding the Ohlins suspension, it raises the bike up and leans too much on an OEM kickstand.

Sent from my iPhone using Tapatalk

**Stoneman** · 10-24-23, 10:52 AM

Originally Posted by Jim

at the dyno today in Orlando. this shop specializes in Grom tuning

Any updated numbers?

**jimmycapp** · 10-24-23, 02:40 PM

Originally Posted by Stoneman

Any updated numbers?

+1. Never thought I would be anxiously awaiting Grom dyno numbers, but here I am.

**Jim** · 10-24-23, 05:58 PM

Originally Posted by Stoneman

Any updated numbers?

very disappointing. 20.5hpnon 90 ethanol free pump gas. the amazon pipe is killing it. could change the cam with something with a different pipe and get to 24hp with ethanol free 93 pump gas.

**feralchimp** · 10-25-23, 01:27 PM

That's still (I think?) about the same power that either of my stock CRF250L's made, so not too shabby!

**xrocket21** · 10-25-23, 01:33 PM

Originally Posted by Jim

very disappointing. 20.5hpnon 90 ethanol free pump gas. the amazon pipe is killing it. could change the cam with something with a different pipe and get to 24hp with ethanol free 93 pump gas.

I never not been disappointed by a dyno! Still solid numbers on such a small bike!

**obsolete** · 10-25-23, 03:10 PM

Originally Posted by xrocket21

I never not been disappointed by a dyno! Still solid numbers on such a small bike!

Butt dyno for the street, time slips for the track.

**RandyO** · 10-25-23, 04:29 PM

Originally Posted by Jim

very disappointing. 20.5hpnon 90 ethanol free pump gas. the amazon pipe is killing it. could change the cam with something with a different pipe and get to 24hp with ethanol free 93 pump gas.

still 125cc? I wouldn't be disappointed. 4 valve head? my ZS190 (2 valve) is allegedly 17hp

**Jim** · 10-26-23, 08:13 AM

Originally Posted by RandyO

still 125cc? I wouldn't be disappointed. 4 valve head? my ZS190 (2 valve) is allegedly 17hp

181cc 2v. the 4v kits arent as reliable

**RandyO** · 10-26-23, 11:20 AM

Originally Posted by Jim

181cc 2v. the 4v kits arent as reliable

good to know

**Jim** · 10-26-23, 11:51 AM

Originally Posted by RandyO

good to know

i believe there is some modifications needed for the 4v to fit properly as well. they make crazy power but not for the average rider that's not checking valves on the regular.

**RandyO** · 10-26-23, 12:05 PM

Originally Posted by Jim

i believe there is some modifications needed for the 4v to fit properly as well. they make crazy power but not for the average rider that's not checking valves on the regular.

the 17 hp is plenty for the spaghetti frame on my K-Pipe, 4valve engines are available for quite a bit more cake, maybe a racer could justify the cost

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