My RC24 resurrection

Were you assuming they were OK and didn't replace them?

 

i've made some gauges for checking float settings, good for consistency. note that carbs must be held at the proper angle.

 

Whenevever I rebuild a carburator that lied around for a certain time, the little o-rings on the fuel joints are leaking. On a normal r4 no big problem, on a v4-carb a horrible job to seperate all these little things.
For the fuel pump we have repair sets for about 20€. This with an additionally diode works in most cases.

 

^^ sometimes rubber parts shrink when dry for a long time (SHRINKAGE !!!) but swell up and seal again after exposure to fuel.......float bowl gaskets especially.

 

When it flows like in the video I won't hope for swelling up. In these cases "new" is the only thing that works.

 

I rebuilt the carbs with all new o rings and float bowl gaskets from v4dreams, so if they are leaking through there, it will be an installation problem, not because of old age.

Basically I need to get them off and do a bench leak test, like I should have done before I put them on! Lesson learnt.


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sometimes rust particles infiltrate and will cause leaks

 

I almost didn't have the patience for the leak-down test, but I am glad I did it. It is all a learning experience so remember that in total you really are not that far from a running motorcycle. You might have a runner before the mid-summer even.

 

The carbs are back off and it’s definitely the float bowl gasket. When I wipe the fuel away it comes back almost instantly along the float bowl cover interface.


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OMFG. I hadn’t tightened the float bowl cover screws down tight!!


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Right, sit-rep from today’s shenanigans. I got the air box and carbs off, to see if I could trace the fuel leak problem. As you can tell from the posts above, it was really obvious. Somehow I hadn’t screwed down the float bowl cover tight when I had reassembled the carbs. They were barely finger tight. So under a minute with my trusty JIS screwdriver and it was sorted.

Carbs and airbox back on and fired her up. No leak; yay! But she was still running lumpy. I went around the exhaust manifolds and cylinder 4 was stone cold, so she’s running on 3 cylinders.

I got the spark plug out and checked the gap and checked there was a spark, which there was. Also a definite smell of fuel.

Swapped the 4 and 2 coils over, to check that the coil anyway, and that’s good. So the cylinder seems to be getting fuel and is getting a spark, but still not firing?

Any ideas?


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A mechanical healthy engine provided, you have only a few opportunities. No spark, no fuel, mixture too rich or too lean. Enclose this by using few starter spray into the 4th carb. If the engine reacts, look again at the carb, esp. the idle systen, pilot jet etc. Perhaps secondary air?

 

It happens. lol I have left some stuff undone that made me question my sanity. Now I assume everything is loose if I have not marked the fastener with a paint pen. That doesn't necessarily mean it is torqued to spec but it is fastened to my likeing.

 

with both of those, it's gotta run. try changing the sparkplug.

also check that the idle mixture screw isn't open more than 3 turns max or less than 1.

 

Haven't read every post in here, but have you checked the needle & seats to ensure they're not leaking and flooding out that cylinder ?

I see Squirrel Man posted about float height - Id definitely check that

Those 2 things would be my bet - I had a GSXR750 doing the same thing on several cylinders, it was dumping fuel like crazy into the cylinders

 

^^ that's another possibility and would show up as a wet, shiny sparkplug.

 

I learn every day here.

 

Did a complete carb strip down and checked float heights so pretty sure they are ok.

I think the plan is to get the carbs off again and do the valve clearances (which I should have done anyway) and see if the inlet valve is stuck.


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Grasping for straws now, mate. Try a compression test cold or hot. Even if floats are set right the float needle could be leaking, so pull the plug after trying to start to check for wet fuel.

 

Ok guys. Some advice.

Fuel pump isn’t working. Do I source an alternative or do I refurb with one of the points kits that I’ve found online?

Pump was getting very hot and not pumping fuel.

Regarding the number 4 cylinder, going to try a different plug and HT lead to see if that’s the issue, before looking at the number 4 carb again.


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