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105264 Posts in 12001 Topics by 1177 Members - Latest Member: fen tractor October 21, 2019, 03:24:28 PM
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XS1100UK Forum  |  Technical  |  Advice Needed  |  Topic: Mikuni RS36-D3K tuning help needed. Rough idle and stalling out on acceleration
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Author Topic: Mikuni RS36-D3K tuning help needed. Rough idle and stalling out on acceleration  (Read 524 times)

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Tom

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You always set up the main Jet and work down

Yep every time, that's why messing around with pilots and tickover first is wasting time ..

I know. Plug chops. First, I gotta get it where I'm comfortable riding it on the road.


Get it so it will at least pull you along, then PLUG CHOPS!! :winker:
It makes you look a tvvat but question everything!!


Tom, belligerent old tosser!!
Dazed and confused

fortj3

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You always set up the main Jet and work down

Yep every time, that's why messing around with pilots and tickover first is wasting time ..

I know. Plug chops. First, I gotta get it where I'm comfortable riding it on the road.


Get it so it will at least pull you along, then PLUG CHOPS!! :winker:

Will do. I haven't messed with it in a couple of weeks, due to the weather.
Today, I pulled and cleaned my engine and frame grounds.
I added another engine ground.
I put 4 gallons of ethanol free petrol in the tank.
It ran better.
I need to, wait for it........
Ride it and do some plug chops.

I tested my pickup coil wires and they tested good.
I tested them between the TCI connector and the connector behind the fuse box panel. Good.
Tested them between the fuse box panel connector and the pickups. Good.
No amount of wire wiggling or pulling made any difference in the resistance. Right at 800 ohms at 32 degrees Celsius.
Now, I need to find a place to do plug chops.
1981 Yamaha XS1100H Venturer
2015 Yamaha SR400
1996 Ford Mustang GT (First and only owner)
1977 Ford F100
1974 Dodge Dart Swinger (Leaning tower of power)

Tom

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Any decent straight with no speed cameras, weekend very early morning is always my choice, no one about.
It makes you look a tvvat but question everything!!


Tom, belligerent old tosser!!
Dazed and confused

fortj3

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Any decent straight with no speed cameras, weekend very early morning is always my choice, no one about.

Sounds like a plan.

After I got home from work today, I made steel mounting brackets for my green Dyna coils.
The original brackets I'd made, and was using, were made from aluminium angle.
The steel brackets made a huge difference.
Andy Gerding had the same problem with Basket Case and had learned that the coils somehow use the steel frame of the bike in the magnetic field.
After reinstalling the coils with steel brackets, I didn't have to use choke, to start the bike.
In fact, it didn't like me using the choke.
Big improvement.
Now, time to sync the carbs and start doing some plug chops.

Thanks for your patience, and your help, Tom.

It's not finished, but it's definitely better. A step in the right direction, you might say.

I think an Italian Tune Up is in order.
I was going to decarb the cylinders with water or carb cleaner sprayed into the carbs, while running about 2500 RPM.
I think I'll just take her for a blast down the road.
1981 Yamaha XS1100H Venturer
2015 Yamaha SR400
1996 Ford Mustang GT (First and only owner)
1977 Ford F100
1974 Dodge Dart Swinger (Leaning tower of power)

Tom

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After reinstalling the coils with steel brackets, I didn't have to use choke, to start the bike.
In fact, it didn't like me using the choke.
Big improvement.
Now, time to sync the carbs and start doing some plug chops.


If you can start without choke its either a red hot day, or your carbs are too rich, it will probably run ok-ish but will use fuel like mad.

Never heard of the steel bracket thing :undecided:  but whatever makes it work.

And syncing is the last thing to do. PLUGCHOPS first.
It makes you look a tvvat but question everything!!


Tom, belligerent old tosser!!
Dazed and confused

fortj3

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Well, it has been very hot here.
1981 Yamaha XS1100H Venturer
2015 Yamaha SR400
1996 Ford Mustang GT (First and only owner)
1977 Ford F100
1974 Dodge Dart Swinger (Leaning tower of power)

fortj3

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Plug chops confirmed that it is leaning out badly under load.
What I've noticed is that the K&N pod filter copies from Dynoman are drying out quickly.
Oil the filters.
Let them sit for a day.
Runs well at first.
As I ride, and the oil gets sucked out of the filters, it starts backfiring.
Backfiring gets progressively worse as I ride and the filters dry out more and more.
No surprise there, as the inlet restriction decreases, along with the ability to filter the air, as the oil is sucked out.
The strange thing is, I can oil them and not run the engine.
Two days later, the top half of each filter has dried out.
At that point, the engine leans out and backfires if I ride it.

Trying to decide my best course of action.
I can buy K&N brand pods.
I can buy generic pod filters.
I can experiment with oiled foam or cloth filter wraps.
Not sure which way to go.
I can make foam or cloth wraps to see how much improvement I get.

Does anyone make pod filters with paper elements, or are foam and gauze the only options?

Has anyone else had problems with oiled gauze air filters drying out quickly?
1981 Yamaha XS1100H Venturer
2015 Yamaha SR400
1996 Ford Mustang GT (First and only owner)
1977 Ford F100
1974 Dodge Dart Swinger (Leaning tower of power)

xsalan

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  • Got to be different
I run Ramair pod filters and never oil them if any dirt gets through the foam it ain't going to harm the engine.

fortj3

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I run Ramair pod filters and never oil them if any dirt gets through the foam it ain't going to harm the engine.

Do you have a part number for them?
1981 Yamaha XS1100H Venturer
2015 Yamaha SR400
1996 Ford Mustang GT (First and only owner)
1977 Ford F100
1974 Dodge Dart Swinger (Leaning tower of power)

xsalan

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  • Got to be different
Just type in Ramair oval filters into ebay and pick the size for your carbs.

fortj3

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#3 and 4 backfiring through carburetor at idle.  Mostly #3. Covering them with my hand, or spraying a small amount of carburetor cleaner into them stops it and smooths the idle.
So I'll be pulling the intake boots and doing away with their gaskets.
I'll just use some aviation Permatex on the sealing surfaces of the boots.

Compression test shows 1, 2, & 3 have 152 psi. 4 has 158 psi but is more heavily coked up with carbon.
This is with engine warmed up, spark plugs removed. Battery fully charged and plugged into charger to ensure same cranking speed for all cylinders. Throttle wide open.
I expect #4 to settle in with the others after  a good decarb session.

I need to get a cam cover gasket and check my valve clearances.  I suspect valve clearances may be a bit tight and need to be re-shimmed.

My OEM exhaust crossover gasket is leaking. How DARE it do that after 38 years of service? :rofl:
So, I need to order exhaust gaskets.
Until I can do that, I'll probably wrap the crossover joint with self-fusing, silicone tape.

« Last Edit: July 08, 2019, 12:27:15 PM by fortj3 »
1981 Yamaha XS1100H Venturer
2015 Yamaha SR400
1996 Ford Mustang GT (First and only owner)
1977 Ford F100
1974 Dodge Dart Swinger (Leaning tower of power)

Tom

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You're trying to get your carbs to work with tight valve clearances and blowing exhausts!!!  Hahaha  :rofl: :rofl:
It makes you look a tvvat but question everything!!


Tom, belligerent old tosser!!
Dazed and confused

fortj3

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Yep. I've bee going about it all wrong.
I've got the can cover gasket and exhaust gaskets in my shopping cart at Partzilla.
Was going to check valve clearances this weekend, but was sick with intestinal virus.

Where can I get the valve shims, if clearances are out of spec?
1981 Yamaha XS1100H Venturer
2015 Yamaha SR400
1996 Ford Mustang GT (First and only owner)
1977 Ford F100
1974 Dodge Dart Swinger (Leaning tower of power)

FJ111200

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Where can I get the valve shims, if clearances are out of spec?


If your local Yamaha dealer or Partzilla can't get them you could try Len at XJ4ever.
Tight end down

https://www.youtube.com/watch?time_continue=12&v=TeyHPAdxuy0

Interesting thought... But don't you need 'members' for a 'Club'..?

If you can't bleed your bike's brakes then you can't have a bike.

XS1100 - it's old fookin' hat.

fortj3

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Where can I get the valve shims, if clearances are out of spec?


If your local Yamaha dealer or Partzilla can't get them you could try Len at XJ4ever.

Thanks.
I seem to recall the Ford Taurus SHO used the same valve shims in its Yamaha engine.
First, I'll see what clearances I have, and which shims I need.
Then, I'll see which, if any, I can swap around to get the correct clearances.
Then, I'll see about sourcing the rest.
As for the #1 cylinder valve leakage, I don't know if it's because of clearances or because of valves sticking as a result of the crappy ethanol gasoline we have in the colonies.
1981 Yamaha XS1100H Venturer
2015 Yamaha SR400
1996 Ford Mustang GT (First and only owner)
1977 Ford F100
1974 Dodge Dart Swinger (Leaning tower of power)

XS1100UK Forum  |  Technical  |  Advice Needed  |  Topic: Mikuni RS36-D3K tuning help needed. Rough idle and stalling out on acceleration
 

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