mikez
New Member
Posts: 10
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Post by mikez on Apr 12, 2024 16:22:55 GMT -5
My SR500 came as a pile of bits.
With a damaged airbox seized Mikuni carb with bits missing,and a Dellorto PHF36 carb.
The bike was rebuilt and the dellorto used.
It's never been great to start but eventually would.
Sequence is.
"Choke" on.
3 kicks and back fire.
Choke off.
2 kicks and start.
Today many kicks no start.
Spray easy start in air cleaner.
It starts.
To my untrained mind not sure if that suggests lean or rich.
I suspect lean as it would originally have had air box fitted.
So ultimately having read this section I would like a Mikuni VM36 but not found one yet.
This leaves me with trying to finally conquer the Dellorto.
Has anyone run a Dellorto and if so what jet sizes would be reccomended.
I did have discussions with eurocarb and they sent me a bigger enrichner "choke" jet but still the same.
Any suggestions including bin the Dellorto appreciated.
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Post by andy on Apr 12, 2024 17:08:58 GMT -5
Mike, what does it run like once started ? I’ve got absolutely no experience on your carb but it’s sounding weak, I had similar starting woes until I went a bit bigger on the needle jet. Hope you persevere 👍.
Andy
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mikez
New Member
Posts: 10
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Post by mikez on Apr 12, 2024 18:56:05 GMT -5
Mike, what does it run like once started ? I’ve got absolutely no experience on your carb but it’s sounding weak, I had similar starting woes until I went a bit bigger on the needle jet. Hope you persevere 👍. Andy Once running it rides well. It's always been awkward to start. I suspect fitting the mallossi cone air filter made it run lean. It came as a pile of bits from the Isle of Man. It's had new CDI,coil and iridium plug to give it a chance to start. I have spark, compression which leaves carburation. I rebuilt it 2015 and then put it to one side. I now have more time,so have spent a few months on resurrection. New tank and tyres. Serviced. Just need to be able to rely on it to start. Regards Mike |
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mikez
New Member
Posts: 10
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Post by mikez on Apr 14, 2024 11:15:26 GMT -5
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Post by andy on Apr 14, 2024 12:52:39 GMT -5
My SR500 came as a pile of bits. With a damaged airbox seized Mikuni carb with bits missing,and a Dellorto PHF36 carb. The bike was rebuilt and the dellorto used. It's never been great to start but eventually would. Sequence is. "Choke" on. 3 kicks and back fire. Choke off. 2 kicks and start. Today many kicks no start. Spray easy start in air cleaner. It starts. To my untrained mind not sure if that suggests lean or rich. I suspect lean as it would originally have had air box fitted. So ultimately having read this section I would like a Mikuni VM36 but not found one yet. This leaves me with trying to finally conquer the Dellorto. Has anyone run a Dellorto and if so what jet sizes would be reccomended. I did have discussions with eurocarb and they sent me a bigger enrichner "choke" jet but still the same. Any suggestions including bin the Dellorto appreciated. Mike, before you go running off to buy different jets make sure your as sure as can be that you’ve tried all possible adjustments e.g needle height, mixture screw, carb cleaner etc etc. Very easy to go and spend loads only to realise you might have put it towards a new Mikuni. Be lucky. 👍 |
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Petes2Wheels
Junior Member
Out riding the country roads
Posts: 91
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Post by Petes2Wheels on Apr 14, 2024 16:04:39 GMT -5
Would go buy a new mikuni or ebay. There is more support and knowledge out there for Mikuni carbs.
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Post by gotsron on Apr 14, 2024 20:21:12 GMT -5
My SR500 came as a pile of bits. Mike, before you go running off to buy different jets make sure your as sure as can be that you’ve tried all possible adjustments e.g needle height, mixture screw, carb cleaner etc etc. Very easy to go and spend loads only to realise you might have put it towards a new Mikuni. Be lucky. 👍 So, I guess I'd think about raising the needle (lowering the clip) one ring, which might draw a bit more fuel at closed slide, and then play with the idle mixture screw when the engine is warmed up to see if it can be enriched enough to affect the idle. If the idle mixture screw can raise the idle while the engine is warm , I personally would lower the slide to get the idle back to normal. Is that anything like you are thinking Andy? I know I go about these things backwards sometimes , but it does sound like a weak mix when starting, not by much, but a little, and lowering the slide tends to draw more fuel from the pilot jet I believe. |
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Post by andy on Apr 15, 2024 0:32:59 GMT -5
Absolutely, that’s where I’m at . The answer may lie within ! Start mixing jets and the whole game changes with one area affecting others……there must umpteen billion combinations of jet sizes, tread carefully 👍.
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mikez
New Member
Posts: 10
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Post by mikez on Apr 15, 2024 3:30:03 GMT -5
My SR500 came as a pile of bits. With a damaged airbox seized Mikuni carb with bits missing,and a Dellorto PHF36 carb. The bike was rebuilt and the dellorto used. It's never been great to start but eventually would. Sequence is. "Choke" on. 3 kicks and back fire. Choke off. 2 kicks and start. Today many kicks no start. Spray easy start in air cleaner. It starts. To my untrained mind not sure if that suggests lean or rich. I suspect lean as it would originally have had air box fitted. So ultimately having read this section I would like a Mikuni VM36 but not found one yet. This leaves me with trying to finally conquer the Dellorto. Has anyone run a Dellorto and if so what jet sizes would be reccomended. I did have discussions with eurocarb and they sent me a bigger enrichner "choke" jet but still the same. Any suggestions including bin the Dellorto appreciated. Mike, before you go running off to buy different jets make sure your as sure as can be that you’ve tried all possible adjustments e.g needle height, mixture screw, carb cleaner etc etc. Very easy to go and spend loads only to realise you might have put it towards a new Mikuni. Be lucky. 👍 Very true. I have thrown £20 into jets to see what happens. Carb apart and looks clean. Float height correct. Mixture screw was 3 turns out changed to 2.5. See what happens. What's the cost of a Mikuni? Any reccomended suppliers. Plenty of Chinese copies out there...In fact I got a vm34 off ebay. It does not run well. |
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mikez
New Member
Posts: 10
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Post by mikez on Apr 15, 2024 3:36:39 GMT -5
My SR500 came as a pile of bits. With a damaged airbox seized Mikuni carb with bits missing,and a Dellorto PHF36 carb. The bike was rebuilt and the dellorto used. It's never been great to start but eventually would. Sequence is. "Choke" on. 3 kicks and back fire. Choke off. 2 kicks and start. Today many kicks no start. Spray easy start in air cleaner. It starts. To my untrained mind not sure if that suggests lean or rich. I suspect lean as it would originally have had air box fitted. So ultimately having read this section I would like a Mikuni VM36 but not found one yet. This leaves me with trying to finally conquer the Dellorto. Has anyone run a Dellorto and if so what jet sizes would be reccomended. I did have discussions with eurocarb and they sent me a bigger enrichner "choke" jet but still the same. Any suggestions including bin the Dellorto appreciated. Mike, before you go running off to buy different jets make sure your as sure as can be that you’ve tried all possible adjustments e.g needle height, mixture screw, carb cleaner etc etc. Very easy to go and spend loads only to realise you might have put it towards a new Mikuni. Be lucky. 👍 Very true. I have thrown £20 into jets to see what happens. Carb apart and looks clean. Float height correct. Mixture screw was 3 turns out changed to 2.5. See what happens. What's the cost of a Mikuni? Any reccomended suppliers. Plenty of Chinese copies out there...In fact I got a vm34 off ebay. It does not run well. |
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Post by andy on Apr 16, 2024 10:23:33 GMT -5
Mike, google this :- motocarb (Liverpool)
Allen’sperformance ( Nottingham)
Possibly the 2 main suppliers in the UK, there are others, check out their prices .
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mikez
New Member
Posts: 10
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Post by mikez on Apr 16, 2024 14:27:48 GMT -5
Mike, google this :- motocarb (Liverpool) Allen’sperformance ( Nottingham) Possibly the 2 main suppliers in the UK, there are others, check out their prices . Well the jets went in the dellorto after full service and as predicted its worse. Starts with easy start. I have been fighting this Dellorto for 8 years on and off. I emailed motocarb but nothing back. I am in email discussions with Kedo who have offered lots of info. Probably buy a VM36 based on what I have been told. |
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Post by andy on Apr 16, 2024 16:48:46 GMT -5
Ring motocarb not email. Similar Allensperformance 👍. Kedo , you will pay heavy 😧
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mikez
New Member
Posts: 10
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Post by mikez on Apr 29, 2024 5:55:04 GMT -5
So the end to this investigation is this.
Changed main jet to 230
Fitted stock Mikuni VM36 ,KN filter.
3 kick start.
And not Been above 30mph but rides and accelerates no problem.
So the answer as stated on other threads on the Internet is.
Remove Dellorto fit Mikuni.
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Post by stevep on Apr 29, 2024 7:58:51 GMT -5
Is it a case of 'The man from Dell Orto, he say No....'  (Edit: I'm betting hardly anyone gets that crack.) |
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