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| Purple Peril Continued................... | |
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| Tweet Topic Started: Dec 1 2009, 12:19 PM (475 Views) | |
| looey | Dec 1 2009, 12:19 PM Post #1 |
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Fizzmeister Extrodinaire
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So, after taking the Purple Peril on from Shaun, today I rode it for the first time to see what's what. I know this is a long going saga with this bike not running right, so if people have had enough I understand Anyways, the story so far for me. Yesterday I spent the day just tinkering and adjusting everything so that I know as much as I can to date. Just took it for a run, started easy and sounds ok. The best way to describe how it runs is upto 2/3rds throttle it rides just as you expect a 30mph restricted version to but when you wind that last 1/3rd of throttle and expect that extra go, it hesistates and splutters. At first it did feel electrical (coil, plug or spark breaking down etc.) BUT, if you hold the choke ON full whilst riding at full throttle, the missing and hesitation completely goes and it does pull a little better, but nowhere near as hard as it should. Now correct me if I'm wrong but if it was ignition, coil, plug or anything like that then richening the mixture by pulling the choke on full wouldn't stop the coughing and spluttering ?. And surely if the mixture was anything like right then pulling the choke on full when the bike was hot would make it run like a bag of poo ???. I'm suspecting carb, disc valve or crankseals or alike ?. Anyone got any ideas ?. Cheers in advance.
Edited by looey, Dec 1 2009, 06:17 PM.
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| Flika | Dec 1 2009, 12:21 PM Post #2 |
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Fizzmeister Extrodinaire
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Would be nice to slip another carb on and try as a starting point I think |
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| eightcans | Dec 1 2009, 02:00 PM Post #3 |
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Fizzmeister Extrodinaire
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Is the carb new?? Their were and maybe still are pattern carbs that do run weak as std. I`ve ridden a Fizz with one of these carbs it wouldn`t pull under load/wide throttle openings. I believe swapping the jets etc with genuine parts can eliminate this prob. Like Flika said try another carb and make sure the fuel bowl vent is attached and vented to still air. It should go up the intake rubber (between the top of the engine and air filter case) and exit through the hole at the back. Good luck
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| looey | Dec 1 2009, 02:18 PM Post #4 |
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Fizzmeister Extrodinaire
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Yeah deffo to try another carb. Don't know what carb is on it but I'll see if Shaun can tell me. Cheers
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| fizzyrestorer66 | Dec 1 2009, 08:43 PM Post #5 |
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The 65mph Club Member
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Andy, the carb is a genuine yam unit and was sold to me as being the correct model for the year, which I am sure "Fizzy Doctor" would be able to confirm as he has seen this bike in the flesh and got it up and running for me.The carb has as stated had a brand new yam float valve fitted. Hope this helps! Shaun. |
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| NAT 666 | Dec 1 2009, 09:20 PM Post #6 |
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Reminiscing my younger years
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I have a pull choke carb you are welcome to try on it for testing purposes - I will pm you my number |
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| looey | Dec 1 2009, 09:50 PM Post #7 |
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Fizzmeister Extrodinaire
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Yeah cheers Nat, have PM'd ya back
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| 50cctuning | Dec 1 2009, 11:49 PM Post #8 |
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Fizzmeister Extrodinaire
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i find the fizz carb lean on the needle try richening 1 or 2 clips |
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| 50cctuning | Dec 1 2009, 11:51 PM Post #9 |
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Fizzmeister Extrodinaire
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to be fair ive dynoed 4 standard fizz motors now and all have only done 3.1 to 3.4 bhp so would say 30 to 40mph is about your lot anyway |
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| looey | Dec 2 2009, 11:01 AM Post #10 |
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Fizzmeister Extrodinaire
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This is way more than just a bit down on power, it will just hold 30mph on the flat in favourable wind conditions, coughs, splutters and slows down with any more than 2/3rds throttle applied and performs much better on full throttle if you pull the choke on full at the same time !. I will try the needle in a richer position but does the needle work different on a FS1E to most other Carbs ?. I thought as a general rule the idle jet controls upto 1/4 throttle, the needle jet/position between 1/4 and 3/4 throttle and the mail jet only coming into play and 3/4 throttle and above ?. That's certainly been the case on all my RD350LC's and X7's. On my YPVS 350 I could control or eliminate the amount of mid-range splutter by adjusting the needle height ?. Edited by looey, Dec 2 2009, 11:07 AM.
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| stevewoods04 | Dec 2 2009, 10:26 PM Post #11 |
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stevewoods04
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I,m thinking when it needs the fuel it aint there so i would check filter in petrol tank (take petcock out of tank) also check float bowl and bore of fuel pipe it seems there is a restriction when bike is asking for extra fuel, also i know when ive highered clip on needle in carb mine has spluttered so try experimenting with positioning of this |
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| looey | Dec 3 2009, 06:53 AM Post #12 |
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Fizzmeister Extrodinaire
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I have a test carb coming today (cheers Nat (nathanael666) ) which I will fit the minute the roads are dry enough for a test run. I will double check fuel flow down at the carb end of the petrol pipe at the same time but I'm positive this has been investigated and eliminated as Shuan fitted £70 worth of genuine Yamaha internals to the carb and a new fuel pipe from tap to carb (again from Yamaha). I'm assuming that if the fuel flows freely out of the pipe where it connects to the carb then there can't be a blockage and the filler cap must be breathing ok ?.Laters
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| NAT 666 | Dec 4 2009, 10:39 PM Post #13 |
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Reminiscing my younger years
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I hope all went ok - I wil await your update mate !
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| looey | Dec 8 2009, 03:20 PM Post #14 |
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Fizzmeister Extrodinaire
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PM'd ya Nat So, finally I got time to get outside and get the carb on that Nat kindly loaned me and guess what..........................only did a couple of miles but it was a totally different bike. I didn't thrash it cos it still needs running in but upto 40 on the flat without any trouble at all with plenty more to come and not a hint of splutter or miss-fire on any amount of throttle including fully open on the stop !.I've since had the old one apart and given it a good clean (including the inside of the jets) and my eyes could be deceiving me but I'm sure the main jet looked a much larger bore when I had run something through it to clean it ?. Run out of time and daylight today but as soon as time and weather permits (hopefully tomorrow) I will stick the original one back on after the clean and see if it's back to as it was. Anyone got a good known working choke cable type carb they would like to sell me to finally get this bike sorted ?. |
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| NAT 666 | Dec 8 2009, 08:27 PM Post #15 |
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Reminiscing my younger years
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I had a suspicion it was a carb related fault - Sorry about the nut - annoyed about that as it did have the correct nut and bolt on it prior to me sending it out two months ago as I had been using on my own bikes but when I lent it to the last person for testing purposes I have now realised a couple of things on the carb where not correct when it came back thats just another part obviously switched I was very disappointed - but on a happier note I am glad its proved a point Andy You could fit an after market carb if you have difficulty getting a genuine early one . Edited by NAT 666, Dec 8 2009, 08:32 PM.
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I was very disappointed - but on a happier note I am glad its proved a point Andy
2:20 PM Jul 11