GP100/125 Carb question

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

Hi Guys

I'm wanting to double check the connections of my pipes to the carb, but as one pipe is missing, I want to make sure its nothing serious.

I have put it down as being so far as the picture says, to which I believe what is what.

Can anyone confirm the same?

1. Oil pipe (quite far back and has a needle inside when you open the throttle and look down the bore, which finishes centrally in the bore0

2. don't know

3. Fuel Pipe (def is as petrol pours out)

4. drain tube ( i think so)

5. Overflow tube ( is it?!)

https://i212.photobucket.com/albums/cc108/CB1Rocket/CARBINFO.jpg

cheers

neil. · World Chat Champion Joined: 24 Feb 2008 Karma :

Don't know your carb or if you've hooked everything up right, but I'd imagine #2 is possibly a breather.
____________________
CBT February 2008 | A2 June 2008 | Yamaha YBR125 (written off) | Honda CBF125 (current)

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

did check number 4 and its not connected to anything.

Still bothered about no. 2 thou! As usual Haynes is crap

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

oh and about the choke, its cable operated which can be seen on the upper most right past the throttle slide

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

any one with news on connection no. 2? cheers

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

My guess would be that it is for a vacuum choke for a second carb. It certainly looks like the vacuum connection on my RD. Perhaps that model of carb is used on twin cylinder bikes?
____________________
British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

Thanks MarJay.

The haynes shows it as a clear plastic tube going over it - any hints on that?

Interesting to say its could be a vacumm operated choke.

Any Suzuki GP100/125 owners on here or have owned and done there own servicing on these bikes?

serlant · Brolly Dolly Joined: 06 Jul 2009 Karma :

Friend of mine has a GP125 and a GP100 and we've had the carbs off both, i'll point him to the thread as i can't remember off the top of my head.

Ragnaco · Two Stroke Sniffer Joined: 10 Sep 2009 Karma :

directed here from serlant, Had a quick look at my gp125 this morning took some pictures.
https://i5.photobucket.com/albums/y189/Ragnaco/2010-07-13104225.jpg
I gave number 2 a good pull, It's defiantly connected to something.

https://i5.photobucket.com/albums/y189/Ragnaco/2010-07-13104234.jpg
Looks quite red? I have no idea what it could be, being red it makes me think 2stroke is passing through it but what do I know.

I know you said you looked in your haynes manual but I tried to find mine to see if you missed anything sadly I can't find the bugger, I'll keep searching and update if I find anything.
____________________
Current bike : Suzuki GP 125 1982

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

Ragnaco

Thanks for replying with a pic, so its connected to something....hmmmm.

If you look at the small tube at the back, that's def the oil fee as I manage to trace that. You can also see that if you open the throttle fully, you can see a needle that finishes in the middle of the bore where the oil drops out.

So far i have it as follows in my original picture

1. Oil pipe

2. Still unsure!

3. Fuel Pipe

4. drain tube ( yes it is)

5. Overflow tube confirmed by Marjay

evoboy · World Chat Champion Joined: 20 Aug 2009 Karma :

https://www.bikechatforums.com/files/carby.jpg

Found on this site.

Altho i dont see how its correct.

Where you have the fuel hose seems correct. Im guessing its a VM type mikuni carb as used on many suzuki's?

Im swaying towards the nipple with nothing attached being a 2stroke feed for some reason. It seems the most logical.

Only way your really gonna tell is if you trace the pipes back.

Is the 2stroke fed into the inlet port via a pump on this bike? (between engine and carb) As that would make sense if the thin black tube runs down behind the carb. (thats how its setup on my GT250 anyhoo)
____________________
Suzuki GT250 x7------- Fazer 600------CB250RS------Aprilia Rally 70----- Bandit 600

APT Motorcycles

Ragnaco · Two Stroke Sniffer Joined: 10 Sep 2009 Karma :

I might get some slack for this, but have you tried starting it up and seeing if anything leaks from where the little black pipe comes down? I'd take a general guess and say if nothing is leaking down then surely it's nothing to worry about.

Also before taking those pictures earlier I had ridden the bike for about an hour yet the tube looks like it hasn't seen a drop of liquid in it for it's lifetime.

Took a new picture.

https://i5.photobucket.com/albums/y189/Ragnaco/2010-07-13144431.jpg

1. 2stroke out pipe (to carb so number 1 the little black pipe is correct)
2. 2stroke oil pump
3. 2stroke oil in.

Also note the big pipe from the air filter box, the tube number 2 basicly heads up in that direction... so now I have no idea.

So to recap

1. Oil pipe (yes)

2. Still unsure! (It's going somewhere to the airbox, breather?)

3. Fuel Pipe (yes)

4. drain tube ( yes it is)

5. Overflow tube confirmed by Marjay (yes)

On a different note can I see some pictures of the bike? Smile

____________________
Current bike : Suzuki GP 125 1982

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

I know what it is I think.

Could it be a vacuum feed for a vacuum operated fuel tap??? Exclamation

____________________
British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

Vincent · Banned Joined: 16 Oct 2006 Karma :

Ragnaco · Two Stroke Sniffer Joined: 10 Sep 2009 Karma :

gravity fed taps and lines.
____________________
Current bike : Suzuki GP 125 1982

Vincent · Banned Joined: 16 Oct 2006 Karma :

Ragnaco · Two Stroke Sniffer Joined: 10 Sep 2009 Karma :

well I have 2 suzuki GP's a 125 and 100cc both have the same carb as cb1rocket has posted, I doubt all 3 have had their carbs swapped out.

most likely just a breather.
____________________
Current bike : Suzuki GP 125 1982

Vincent · Banned Joined: 16 Oct 2006 Karma :

When the carbs are made, the vacuum take off is on all of them and just blanked off if used on a bike with gravity feed.

Vincent · Banned Joined: 16 Oct 2006 Karma :

Hang on a minute, the carb in your pic is different to the OPs Rolling Eyes

Ragnaco · Two Stroke Sniffer Joined: 10 Sep 2009 Karma :

pift, slightly.
____________________
Current bike : Suzuki GP 125 1982

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

the carb i have matches exactly the one as shown in my haynes manual - Ragnaco carb is very similar but essentially the same setup.

Ragnaco could you pull on the clear (now discoloured red) tube away? or is it fixed to something? will get some pictures up, by the way it has a different wheel at the back - a gs125 alloy!?!?

Ragnaco · Two Stroke Sniffer Joined: 10 Sep 2009 Karma :

I gave a good yank with reasonable force and it did not come free, Did not want to chance unhooking it from anything and not being able to get it back on Razz

might just be the fact the tube is so old and rotten that it's turned into solid plastic Razz

but Iv had the carb out several times before and that tube stays hanging in place.
I'm pretty sure it's nothing important if it's going up into the airbox like it looks like it can't be doing anything that important.

I have a set of alloys for this bike, never been bothered to clean them up and put them on though Id feel like a right prick riding my rust-bucket around with alloys on anyway, It's bad enough riding with my knees up around my ears.
____________________
Current bike : Suzuki GP 125 1982

cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

well i had to take off my alloy and give it a good spanking clean and strip off the black flaking paint, still got some tight area which i will nitromors later once it passes the MoT - its been laid up for 7 years! I have a wire wheel on the front and a alloy on the rear - stupid me thinks - so i bought a gs125 front alloy for 20 quid with disc of the same size. Cool

Just got to get it fitted, but me thinks it won't be a stright swap and may have to change the bearings and spacer tube to suit.

Anyway about the carb, its just that when the bike runs, there is just no power above 1/3 throttle. Any higher than 1/3 throttle and the engine just dies. I know me thinks the carb is just so bloody gummed up, me thinks the main jet is blocked. So its just running on the pilot jet. Got some carb cleaner which i trying spraying stright into the bore and down the fuel connection. I just don't want to take the carb apart - I have stripped carbs before and its alot of work and then finding a gasket to replace the old one.

All this was as I took it to the MoT it basically had no power but sounds fine when ticking over. I had to push it home up the hill with a bit of leg pushing and loads of smoke! lol Embarassed

Ragnaco · Two Stroke Sniffer Joined: 10 Sep 2009 Karma :

iv took the carbs apart on both my GP's several times not alot of parts to these small carbs and the haynes manual talks you through it step by step. Screw the gasket, I never replaced it and it probably has not been replaced in the last 5years+ just did the float bowl up extra tight.

If you wanted to talk on msn something about other things on the bike (mine constantly comes into problems I have to botchfix up with serlant) PM an email or something.
____________________
Current bike : Suzuki GP 125 1982