MSX125/GROM big bore kits

[oscar777]

After quite a bit of searching we finally found a bike my gf is comfortable riding, the msx125 (GROM in America).

Quite a nippy fun little bike, so since she wants to keep it for a while even after doing her A2 license, Ive considered going with a big bore kit like this one: https://www.superbikeunlimited.com/presta/grom/629-yuminashi-honda-grom-msx125-164-pcv-light-bore-kit.html

Thoughts? How difficult would this install be? Ive stripped and rebuild two strokes before but obviously this would be a bit more complicated.
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Push bike with a 80cc jerry rigged 2 stroke---> CBR125R ---> GSXR600 ---> Ducati 1098SF

[piazza]

Check out this thread, theres a few on here now

https://www.bikechatforums.com/viewtopic.php?t=310435

[oscar777]

Clearly I need to speak to wots then ha

Im just unsure of which kits are the most reliable, actually give you any customer support.

The Yuminashi 164cc looked the best as it comes with fuel controller with customisable mapping etc and dynode it at almost 17hp at the wheel
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Push bike with a 80cc jerry rigged 2 stroke---> CBR125R ---> GSXR600 ---> Ducati 1098SF

[wots]

Takegawa 181, more punch than you would imagine from a 125.

UK distributor who provides assistance and instructions in English.
https://www.bikechatforums.com/viewtopic.php?p=4204900
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Currently: Yamaha DT 125 LC2,Repsol Fireblade, and Bumblebee MSX 125

[oscar777]

Very nice

Does this allow the motor to achieve higher rpm? If not then i see how you're not getting an improvement in top speed.

Ive managed 71mph stock on this bike believe it or not. (in a fatal position, wind at my back) So I would want it to have that bit of headroom to get to 80 if needed.
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Push bike with a 80cc jerry rigged 2 stroke---> CBR125R ---> GSXR600 ---> Ducati 1098SF

[Rogerborg]

[wots]

[Northern Monkey]

[P.]

[Rogerborg]

I want a pony and a ice cream and a Alyson Hannigan onna pony.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[Matt B]

[Northern Monkey]

[P.]

[Silver_Fox]

[G]

My standard answer; have you already got the bike?

If not; I'd certainly consider something like a pitbike.
Easily swap in a more powerful engine with loads of options out there. Bike weighs less. Is more nickable, but partly due to weighing less.

[redeem ouzzer]

[G]

Yea; heard they don't use enough flux when welding them!

(Though, I'd hope the MSX has a less budget build quality given it's price - but, checking, it's exactly the same as the current Chinese CBF.)

Plenty of options for clocks and electrics on road legal pitbikes and similar.

[Northern Monkey]

The frame and major structural components seem ok, but some of the fixings and fasteners are made from cheese.

The exhaust is made from cheese which was rejected by the cheese factory due to low resistance to rust
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Fisty: after polishing the tank with the glistenng beads of sweat from my full hot scrotum, I filled the headrace bearings with 10cc of my manmilk

[Rogerborg]

MSVA test, lucky-dip insurance, a tank the size of a gnat's scrotum, then it's not worth a fraction of what you've spent on it.

I am of course scouring eBay and Gumtree for "road legal pit bike" as I disparage the idea.

WK do the "Tomcat" for about £970 OTR:

https://i.imgur.com/9juYgtH.jpg?1

Which leaves you a fair amount to spank on futilely trying to make it faster. It also looks meh, will be worth nothing (they've only sold 34 of them in 2 years) and parts are likely to be unavailable.

Lexmoto seem to be missing a trick here.
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[G]

If you're going DIY:
No MSVA needed - get one with bigger wheels and MOT/register as an enduro bike. (I measured one of mine up and would be ok, possibly with a bit of extra foam on the seat.)
Fuel tank - could easily add one of the front mounted auxiliary tanks sold for dirt bikes which'd give it a good bit more than the MSX.

Would spend a bit of time, but I still reckon you could make a profit, if anything.

[stevo as b4]

The big bore MSX certainly sounds like a fun small bike with lols fitted as std. Damn seeing all you happy MSX owners and the tuning options you've got for fucking around with them for fun, makes me want my own.

If someone could tell me where to get a mint Kawasaki KSR80 I'd have one asap! I wonder how it would compare to the MSX though and is it as good?

[Northern Monkey]

[G]

[Rogerborg]

[G]

While a few extra cc can make quite a difference (ie, so far I'd say it's quite noticeable steps from 125 to 140 to 160 pitbikes (though the first especially more because the 125s have been generally not-as-good engines overall)...
Overall I'm sceptical of big bore kits etc. Just stick a bigger engine in, or get a bigger bike.
(Though 164/181cc from a 125, more reasonable.)