revtothelimit - motorbike forum

If it's you going into the limit zone tell them the brakes are really bad and you couldn't slow down in time. I'm sure it'll help mitigate your punishment

cheb wrote: Thu Aug 31, 2023 5:56 pm If it's you going into the limit zone tell them the brakes are really bad and you couldn't slow down in time. I'm sure it'll help mitigate your punishment

I think I may have been leaving the 30,but that powerband,y'know how it is.

I was out yesterday and the left side carburettor started to piss fuel out the overflow. Judicial whacks with a screwdriver handle failed to impress the offending article at all.

Today I whipped off the carb and rigged up a temporary fuel supply just to see what may be happening. The float was rising as it should,no holes in it,nor any cracks in the float bowl brass overflow pipe. The float was closing the needle jet and cutting off fuel as it should. In fact,where it was set it was closing off the fuel slightly earlier than it should,which makes it less likely to leak.

The fuel level ought to be between 2 and 4mm from the bottom of the carb body,it was 6mm,so I made it 3mm. Probably a more accurate way than setting float height.

I cleaned everything beforehand and then set it up. No leaks. Left it for a couple of hours and still no leaks.

I'm always twitchy when I don't find a definite cause of a problem,to my mind if it isn't fixed,it'll come back.

All I can think of is dirt in the fuel causing the float to stick,as it was properly pissing out,not just a drip.

Time will tell.

At least I'm well reacquainted with Mikuni carburettors.

I had constant problems with this and pilot jets getting blocked, I've ended up getting the bottom cut out of a fuel tank, both half shot blasted and welded back up again, it wasn't cheap, but was a lot cheaper than getting a new tank made.

Inline filter.

I thought you already replaced the needles but just in case, carefully examine the viton(?) rubber tips on the needles. Ethanol can get behind them and the water seperates out causing rust then the rubber bulges in small spots so it doesn't seal

Skub wrote: Fri Sep 22, 2023 7:58 pm I was out yesterday and the left side carburettor started to piss fuel out the overflow. Judicial whacks with a screwdriver handle failed to impress the offending article at all.

Philips or flathead?

JackyJoll wrote: Sat Sep 23, 2023 8:59 am Inline filter.

If it keeps happening,I'll do that.

Ian wrote: Sat Sep 23, 2023 12:37 pm I thought you already replaced the needles but just in case, carefully examine the viton(?) rubber tips on the needles. Ethanol can get behind them and the water seperates out causing rust then the rubber bulges in small spots so it doesn't seal

Yeah,I replaced the needle jets with viton ones a while ago,they are sound and stop the flow as they should,so ruling them out my suspicion falls on a sticky float. Of course I couldn't get it to stick while checking,they only do bad shit when I'm not looking.

Potter wrote: Sat Sep 23, 2023 4:14 pm I used to get this loads, it was a pain in the arse, but since I've been using the lead substitute/stabliliser I haven't had it, so I think it was crap fuel gunking up or something. It doesn't take much to make the floats stick.

I'm gonna give this a try too.

ZRX61 wrote: Sat Sep 23, 2023 5:39 pm

Skub wrote: Fri Sep 22, 2023 7:58 pm I was out yesterday and the left side carburettor started to piss fuel out the overflow. Judicial whacks with a screwdriver handle failed to impress the offending article at all.

Philips or flathead?

JIS,silly.

My RGV250 used to randomly dump fuel all over the garage floor and RGV carbs are not the most accessible.
My little petrol lawnmower has no fuel tap and relies on the carb needle to keep fuel in the tank, it never
lets me down.

kendo57 wrote: Sat Sep 23, 2023 7:39 pm My RGV250 used to randomly dump fuel all over the garage floor and RGV carbs are not the most accessible.
My little petrol lawnmower has no fuel tap and relies on the carb needle to keep fuel in the tank, it never
lets me down.

Sod's law.

I'll have to see if I can dial back the oil pump cable a little,it really smokes using big throttle openings and holding it at 90mph makes the world disappear. Even the stroker smoke junkies wanted me at the back of the group.

Skub wrote: Sun Oct 08, 2023 6:20 pm I'll have to see if I can dial back the oil pump cable a little,it really smokes using big throttle openings and holding it at 90mph makes the world disappear. Even the stroker smoke junkies wanted me at the back of the group.

There's a guy on the RD LC Crazy forum who services LC/YPVS oil pumps and does a fantastic job for not a great deal of money. Would you like me to ask him if he'd be prepared to service your KH1 pump?

mangocrazy wrote: Sat Oct 14, 2023 9:27 am

Skub wrote: Sun Oct 08, 2023 6:20 pm I'll have to see if I can dial back the oil pump cable a little,it really smokes using big throttle openings and holding it at 90mph makes the world disappear. Even the stroker smoke junkies wanted me at the back of the group.

There's a guy on the RD LC Crazy forum who services LC/YPVS oil pumps and does a fantastic job for not a great deal of money. Would you like me to ask him if he'd be prepared to service your KH1 pump?

I'll not fix what isn't broken just yet,but many thanks for the offer,I'll definitely keep it in mind for the future.

I just checked back through my PMs from him and he only does Yamaha pumps, so it's not an option anyway. But I would definitely ask around on the Kawa H1 forums and see if anyone does a similar service for them. The pump is 50 years old and I'd be surprised if it's ever been serviced in that time.

mangocrazy wrote: Sat Oct 14, 2023 2:46 pm I just checked back through my PMs from him and he only does Yamaha pumps, so it's not an option anyway. But I would definitely ask around on the Kawa H1 forums and see if anyone does a similar service for them. The pump is 50 years old and I'd be surprised if it's ever been serviced in that time.

I think the pump is ok,they either work,or leak and I know it's definitely working.

There's not much scope for adjustment,one mark to line up just off tickover and the other on full throttle. Mine is fine with the first and only a little over on full throttle.

Perhaps I need to treat the old girl a little more sympathetically.

Skub wrote: Sat Oct 14, 2023 3:31 pm Perhaps I need to treat the old girl a little more sympathetically.

And lessen the volume of that glorious soundtrack? You cannot be serious...

Riding at sensible speeds can cause a buildup of oil residue in the exhausts, which burns and smokes a lot when you eventually do nonsensible speeds.

One could always do sensible speeds at non-sensible engine revs (i.e. in the power band) everywhere, however this does tend to encourage RLAT.

Anyone who buys a bike like that has a lot to live up to.

mangocrazy wrote: Sat Oct 14, 2023 4:45 pm One could always do sensible speeds at non-sensible engine revs (i.e. in the power band) everywhere, however this does tend to encourage RLAT.

Yeah,the H1 has already been instrumental in achieving my first 3 penalty points at the grand old age of 68. The evil needs a strong hand.