O/t '95 Gn125

[XL-erate]

Hi all!

Hope this isn't too far of topic, but couldn't find where else to post as no tech question allowed in 'Off Topic'.

I just picked up a '95 Suzuki GN125E 4 stroke 125cc on the cheap. Pretty good shape. Haven't ridden it yet as it needs some maintenance & tires. From what very little info I found on the net it's not exactly a screamin' powerhouse.

Anybody got any info on the engine family so that I could cross reference for cams, pistons etc? Any general suggestions? Also wondering about a 175 to 200 engine that might be a reasonably close fit to swap? Just want to put a little more zip in the grip. My spare GS550 engine doesn't look like it will fit, but I checked

Thanks!

[Steve]

You haven't ridden it yet and you already want more zip in your grip? :shock:

Give it a fair chance. It's not big enough to get on the freeway, but I'm sure it will be a dandy little commuter bike.

For all the effort of doing an engine swap, I don't think you would get that much more power. Stick to stock and enjoy the mpg with the price of gas nowadays.

.

[LeeGS550E]

I've got a GN400, and as far as I can tell (which isn't very far), my bike uses the same powerplant (if you can call it that) as the DR series of bikes from the same era. Maybe go looking for the DR 125 if they made one, and perhaps old DR performance parts?

[XL-erate]

Thanks, that's good advice. Problem is, where I live I have to ride 20 miles before I reach level ground. Most of the mountain roads are at least 6% grade if not more, and very tight twisties too. I ride my freshly rebuilt '74 XL-100 and it's straining to make it, though I have a 125 engine to install in that. I'm sure the Suzuki will have more power but still not enough to put much excitement in things.

I notice the Suzuki is very well built, solid, nothing cheap about it. Probably a long term keeper for me. Other problem is I can't find out what Suzuki heritage it draws off of, or what is common to other models. Thanks for the suggestions.

[XL-erate]

Thanks, Lee, that was what I meant. I don't know Suzukis well and didn't know if the DR was 4 stroke or 2 stroke. If DR's are 4 strokes then I'm sure it's the same critter, with the GN125 detuned for sedate street riding. Thanks!

[bwringer]

Maybe switch to light beer and salads for a while?


I think the GN counts as a GS. It's close enough for us, so don't worry about that.

I don't know a thing about them, though I would start by perusing and comparing part numbers. As noted, it's a good bet that it's the same engine as a dirt or dual-sport bike of the same era. Suzuki never re-engineers anything unless they have to, so there are some surprising commonalities.

The cases might be different, but look at things like gaskets, pistons, etc. to get an idea of what fits what.

[XL-erate]

Good idea on P/N's. I'm new to Suzuki and all the 125's I remember were smokes, not 4 strokes. I'll check some pistons & stuff and probably get the final answer. Thanks!

Just wondering: if GS stands for Grand Sport I wonder if GN stands for Grand Not-Sport?

[XL-erate]

Maybe switch to light beer and salads for a while?

Hey, if there was any less of me I'd have to tape my hands to the bars so I didn't get blown off. Kind of like a wire haired terrier, maybe more like a rat terrier....