Honda g42

[Calliass]

Got an old Honda g42 for £20 in an autojumble have a chassis any ideas on tuning the engine for more power

 

[mckutzy]

Hello and welcome...

Your going to have to be more specific as to what is a "autojumble" is that a brand?
And also with said motor/chassis... We need pics as to what your referring to?

 

[Randy H]

Got an old Honda g42 for £20 in an autojumble have a chassis any ideas on tuning the engine for more power

Gee, that engine is around 40 years old, I believe. I don't know what the weak points of that engine are. You can easily get more power, but what is going to break first? Who knows how strong the connecting rod is? Good luck finding any parts to increase the reliability, let alone high performance parts.

However, you can remove the governor, add a free flowing exhaust, and intake, rejet, advance timing. Valve float may prevent catastrophic failure. In which case add stiffer valve springs. Maybe now the rod will break, or the flywheel will blow up.

 

[itsid]

Hello and welcome...

Your going to have to be more specific as to what is a "autojumble" is that a brand?

a jumble is pretty much a flea market Mac...

Now, 171cc if I'm not mistaking..
L head just as our beloved briggs..
And for all I know there is no mechanical governor to be removed
(vacuum style governor? ... can't tell tbh)

nice engine though.. if it made it this far it's likely going to last for another while..
As long as you provide good maintenance.
I'm not sure it's the ideal engine to be "power modded" though.
Since while I do believe it's conrod will outlast many new conrods (even Honda ones perhaps) it's still old, tolerances may be out by now (crankshaft bearing seats for example)
we don't know how many people have been messing with it until now
what's cracked, what's maintained and what's badly fixed etc.

IMHO, open it up, give it a complete overhaul,
check for tolerances [if you can find a service manual that is]
put it all back together and ride it as hard and wild as you want.
But apart from a mild mod
(more fuel/air mix, less restrictive exhaust and an accordingly set governor [disabled])
I would not put any effort in to get more hp.

Don't worry, it already has plenty power for serious entertainment;
it's just not fast nor quick enough to sooth the pubertarians need for speed.
but adults are likely to enjoy it


'sid
if you cannot find a shop manual for the g42..
get the g150 shop manual (it's at least good enough to cover some basics for you)
http://www.honda-engines-eu.com/shop-manuals?e=0_50&p=all&d=all&l=en_GB&t=all

 

[mckutzy]

Well that's a new one... Must be a more europian term...
Thanks...

 

[itsid]

Well that's a new one... Must be a more europian term...
Thanks...

Is it? IDK
jumble... for clutter or in american terms ballup
*shrugs*

I think I've heard that around here before.. jumbled up stuff..
I can't remember.
(a quick search later)

Kartcalc.net on your mobile device (unless the app is down).
The jumbled mess below will be less help than the app.
....

hehe that one even incl some promotion (carefully picked example so to speak )

'sid

 

[ezcome-ezgo]

Picked up "at an autojumble". You should be able to noodle that out with a little effort.