[janis]

Anyone tried any of Yuminashi's bore kits for the Grom? Going through their site I see they offer a light bore to 150cc ($270), big bore to 180cc ($307) and a super to 200cc ($307) .::: YUMINASHI GLOBAL OFFICIAL WEBSITE - .::: MSX125 / Honda GROM CYLINDER KITS

the light bore 150 can be used with the stock head and valves, the 180 kit needs Yuminashis own larger head but will work with the Groms stock crankcase, while the 200cc kit requires a new Yuminashi head and crankcase...

something I would be interested in experimenting with, just never played with the bore on a bike motor before. Any input would be appreciated!

 

[Miamigrom]

Wish they posted dyno data.

 

[GromGuy]

Wish they posted dyno data.

Same here, that would make people much more inclined to get these. Plus the bigger we go, doesn't that mean other things would need to be upgraded as well?

 

[forkseal]

Im waiting until yoshimura or two brothers makes a kit. Yumonashi whos that? Lol

 

[forkseal]

Does the 180 kit come with head or is that more $$$$?

 

[Miamigrom]

Sorry if this has been discussed before but they claim the ecu will adapt to the larger injector and bigger bore. What sensors does the grom come with stock maf,ait etc...?

 

[forkseal]

Do u have to change anything else with a bigbore kit?

 

[Big Chris]

Im waiting until yoshimura or two brothers makes a kit. Yumonashi whos that? Lol

I dunno about yosh but I would not get it from two brothers.

The yumonashi cyl kits are bolt on and on thier site they indicate what else you would need when getting these BBK's I myself will be waiting on a supplier to get these for me I am interested in a 180 kit and head with cam and injector the head will be ported as well when i get it.

 

[StylesStunt]

How much does the labor cost for installation and all to have it running on the Grom?

 

[janis]

How much does the labor cost for installation and all to have it running on the Grom?

How much are you going to charge yourself for install LOL. If you dont want to do it yourself you could always take your Grom and the kit over to a local shop and see what they'll do you for...

 

[Big Chris]

if you cant do it yourself then you shouldnt do it because when it breaks down you can fix it

 

[Strokd_GE]

^ exactly

 

[Strokd_GE]

I dunno about yosh but I would not get it from two brothers.

The yumonashi cyl kits are bolt on and on thier site they indicate what else you would need when getting these BBK's I myself will be waiting on a supplier to get these for me I am interested in a 180 kit and head with cam and injector the head will be ported as well when i get it.

The ones you see on eBay from Motorsport something is yuminashis only US dealer but they're selling the kits for 325 for just the 150.. Maybe contact them about the 180 and all the other parts

 

[turbo chris]

Im waiting until yoshimura or two brothers makes a kit. Yumonashi whos that? Lol

Masato Yuminashi is his name. You need to check his vid on youtube. His 180cc Grom test bike does 97mph in traffic. I don't think I am ready for that yet. But soon.....

 

[Big Chris]

I seen that video but do you really know if the speedo is acurate? he could have changed gearing causing it to read differently. I have not searched it on ebay as i dont like to buy parts there.

 

[janis]

heres the video for those who havent seen it

[ame=http://www.youtube.com/watch?v=V6trXxQyFQ8]Yuminashi Factory Footage MSX125/GROM125 180cc - YouTube[/ame]

Even if the speedo isnt acurate, look how hes passing people on what looks like a highway. I've seen other Grom videos and it certainly cant do that by itself.

 

[smoke4ndmears]

Yuminashi 150cc light bore kit installation 2.0

 

[Strokd_GE]

I seen that video but do you really know if the speedo is acurate? he could have changed gearing causing it to read differently. I have not searched it on ebay as i dont like to buy parts there.

The bike was resprocketed, it showed like 97 or something but reality it was doing a bit over 80, 80 is still hauling but certainly isn't 97

Why wouldn't you buy parts off eBay? eBay is the greatest place to shop next to amazon

 

[whitedevilws6]

It would have only read faster than actual if it was geared down. Not sure which way the bike was geared, but I'd think it was geared up, if anything.

 

[turbo chris]

Either way, he was haulin ass!! My 180cc Ruck went 75 with me on it and it is stretched waaayy out and that was sketchy.