GS250 idles but won't rev

[teddux]

Thanks for the reply. I'll have to get some weatherstripping and add it to the airbox lid then, would that be enough to cause the bogging when i go to rev it?

As you were told, you are wasting time on the airbox.
And yes, nice bike. Pitty it fell into YOUR hands (and not mine, lol).
What year is it?

Regarding tyres, if they weren't in direct sunlight, as it seems, then they should be okay.
I would be more concerned on inner TUBE condition.

[BassCliff]

Thanks for the reply. I'll have to get some weatherstripping and add it to the airbox lid then, would that be enough to cause the bogging when i go to rev it?

Hi,

Yes, the stock air intake system can have NO leaks. This insures the proper amount of air being taken into the carbs with the stock jetting. If you have air leaks, more air gets taken in and throws off the fuel/air mixture. When you have more air, you need more fuel. This means installing larger jets in the carbs to get the proper fuel/air mixture.

Your airbox is different but check these out anyway.

Here you see weatherstripping on top of the air filter cage being inserted into the airbox...



And here you see weatherstripping applied to the side covers of the airbox...



And here are more pictures illustrating an airbox fixup...

Airbox Sealing
(by Mr. Roostabunny)

Here is a guide to an entire air intake refurbishment...

Air Intake Repair:
(Airbox removal, intake boots and O-ring replacement)

Your airbox is different, but you get the idea.



Thank you for your indulgence,

BassCliff

[teddux]

The 250 and 425 are similar.
The airbox was never an issue on my 425, ran without it:
this was.
Especially if it runs on choke only.
Since it has been sitting and the fuel "varnished" that orifice.
Year, pls.?

[BassCliff]

Hi,

Yes, clean carburetors are mandatory. This cannot be stressed enough. That picture is from the venerable carb rebuild series in the garage section of the GSR homepage. Here's the link to the whole thing...

Carb Cleanup Series


Thank you for your indulgence,

BassCliff

[Zwaylo]

The bike is a 1980. Thanks for the responses guys this will give me some things to check into. The bike starts right up on choke and will immediately idle after turning the choke off, but will accept no throttle at all with the choke off. I'm planning on tearing the carbs off again next week to thoroughly clean them, I just saw the link to the carb rebuild series and will follow that exactly, assuming that the gs250 carbs are similar to the 850.

[teddux]

The bike is a 1980. Thanks for the responses guys this will give me some things to check into. The bike starts right up on choke and will immediately idle after turning the choke off, but will accept no throttle at all with the choke off. I'm planning on tearing the carbs off again next week to thoroughly clean them, I just saw the link to the carb rebuild series and will follow that exactly, assuming that the gs250 carbs are similar to the 850.

NO!!!
That series is for REBUILD!
AKA, OVERHAUL!

Just stay to the CLEANING parts.

I would just drop the sumps in situ and give a quick spray test as in pic.
It should have a VERY NICE STREAM out the other end. It (spray) won't work the other way around.
Keep clear of face or use protection.

Just drop the bowls using a stubby #2 Philips screwdriver.

[Zwaylo]

Thanks for the heads up! I'll make sure to pull the bowls off the carbs and clean that particular passageway. I'm almost positive that i overlooked it when I had them apart.

[a747freak]

Zwaylo,
Welcome. I also have a '80 250T and I must say..I am very jealous. I wish mine looked half as good as yours! I didn't even know the side covers shined up that nicely. I think I'm actually going to use your pictures as a guide for how mine SHOULD look! I'm afraid I can't offer any advice that hasn't already been offered to you, but I wish you the best of luck in getting that beauty running properly!

-Steve

[teddux]

Zwaylo,
... I also have a '80 250T... I'm afraid I can't offer any advice that hasn't already been offered to you...

Can you go take off your air-filter and leave the cover off?
Start bike and observe how ?IF? runs.
I/we am/are interested in knowing if the air-filter affects this bike as BassCliff mentioned and I don't want to misguide...

Maybe someone should start a sticky on which bikes are affected by air-filter.

I just pulled my T-shirt off me back & STUFFED it in my AIRbox and my CDI functions FLAWLESSLY, Matchless.
-----------------------------------------------------------------------------------------------
Whoever made slanderous comments on my repairs and "OIL/chain" remark WILL be SUED 4 LIBEL.
Sheesh.
Most of you have 30-yr. old parts when I MAKE MINE NEW!!!
Oh, ALL by MYSELF, steve, not some crap paid for from CHINA that you think will be successful.

[a747freak]

Can you go take off your air-filter and leave the cover off?
Start bike and observe how ?IF? runs.
I/we am/are interested in knowing if the air-filter affects this bike as BassCliff mentioned and I don't want to misguide...

Maybe someone should start a sticky on which bikes are affected by air-filter.

I just pulled my T-shirt off me back & STUFFED it in my AIRbox and my CDI functions FLAWLESSLY, Matchless.

My bike runs perfectly fine without the air filter and cover. I ran it almost exclusively without the air filter for a while when I first got it.

[teddux]

My bike runs perfectly fine without the air filter and cover. I ran it almost exclusively without the air filter for a while when I first got it.

Thank you.

It's all coming back to me, SLOWLY!

I remember my Honda CB650 Nighthawk had this problem with "air-filter".

The truth is that it's the CALIBRATED air inlet, not the air-filter...

[a747freak]

Im gonna take back what I said about the air filter/cover. It seems the others were right, because now that my carbs are clean having the cover off the airbox makes a HUGE difference with how the bike runs. It wouldn't idle for me without the cover on. Sorry for misleading.

Steve

[mustangflyr]

Zwaylo, Do you need an owners manual for that?

[Wallowgreen]

Kind of lost track of this thread with all the moving around and such I suppose.

Anyhow, for pitty's sake take BassCliff's advice if you haven't already and COMPLETELY STRIP AND CLEAN EVERYTHING in your carburetors. The bike has been standing for a while and there is only one way you can avoid having spotlessly clean carbs, that's to have a bike that doesn't run as it should and you'll always be fiddling with it.

As you know, I have one of these machines and used exactly the same procedure on the carb pair as I did with the rack on my 1100. They're smaller but the same type. O-rings from Robert Barr will work, just use the standard CV set and keep the spares.

Good luck!

[Zwaylo]

Hey everyone,

It has been a long time since I have been on here so I figured I would give an update. I got the bike running perfectly now, it turns out that the carbs just needed re-jetted. I have put about a hundred miles on it since. My goal is to make this my secondary bike next season in order to keep the miles down, since it is currently has only 3850 miles. I am amazed at how much fun it is to ride for being only a 250. I'll post some higher quality, current pictures this weekend. Thanks, Matt