New Member Any help with GSF250v

The coils are located under the fuel tank near the headstock.

Check the condition of the leads and caps, they corrde and break with age, and these bikes are 20 years old. New spark leads can help.

 

Carefully touch exhaust headers after its warm to see which cylinder isn't firing. Alternatively pull the plugs and check for spark. Id that checks out ok id do a compression test. Someone will be along shortly that knows the gsf250v back to front

 

Have a look at my re-store thread

https://www.2fiftycc.com/index.php?threads/any-help-with-gsf250v.10783/#post-129152

I had a similar problem with the left side cylinder. No1 from left to right. Exhaust colder that the others. Bike sounded terrible - though the original engine had a big end issue.

You can replace the leads separately to the coil.
There is a pic there so you can see the coil without the lead in it.

I found that when I "touched" the leads, they fell out of the coil. I replaced all of the leads anyway. When you do, spread out the wires in the new leads before you screw them into the coils and the plug caps. Just make sure you screw them in all the way otherwise you won't get a good connection. I thought mine were all in tight, but the left side once again came loose.

Once you remove the lead from the coil. Put a small thin screw driver down into the coil to measure how far the new lead needs to be screwed into the coil so that you know it is in all the way.

I replaced all the leads on mine just to be on the safe side and it started up fine then. After that I balanced the carbies and it now runs perfectly with the replacement motor I bought for it. Hot or cold start is fine and idles perfectly.

 

Spray water in the exhaust headers and see which is not firing, look at the carb for that cylinder first. Check the mixture screw setting, needle clip position, condition of the diaphragm, jets, and o-rings.

Failing that it could be a compression / valve issue. Clearances in these are a bit trickier due to the variable valve lift on the inlet camshaft. I haven't gotten around to checking the clearances on mine yet, been avoiding it due to lack of special tools etc but the manual is in the resources section.

 

same thing with the one I bought.

The previous owner said he has soaked the carbs and cleaned them out. Seemed to know what he was talking about, even showed me through his workshop.

When I initially took the bowls off, it all looked quite clean etc, so though, he must have done a proper job. But even after I got the replacement engine going and seemingly running well, the idle at times and starting was a bit iffy.

The other day I did a complete tear-down of the carbs and well, the amount of rubbish I found in them was insane and the crud that was stuck to the jets and needles as well.

This is a good video to watch - thought it is sped up a bit so you may to to slow it down in some spots.. It will help you do to do the job.

 

Some of the GSF250V models were officially imported, mine is, the part number is 32900-11D30