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ULC Soulagent wrote:Put ur hand ( protected) over the end of the exhaust tailpipe and providing u don’t have any leaky joints then if ur seal has gone then the engine will still run
Scooterlam wrote:So what were led to believe is if the DS oilseals gone and the pipe is blocked. At bdc the exhaust gas is exiting via the opposite transfer into th pc chamber without mixing withor igniting the new charge and out thru DS oil seal whilst simitaniuosly fresh charge iis drawn thru the remaining transfer?
neil64 wrote:Hello.
Seem to have quite a bit of smoke coming from scooter when running ,how do you check the drive side seal is good ?
Warkton Tornado No.1 wrote:
(I've long since concluded that primary compression, or the raising of it, is not something worth pursuing, particuarly when the engine is being run with good expansion chambers in conjunction with other tuning measures to raise power. I have known people run engines for thousands of miles with a blowing drive side oil seal & they just kept topping up the chaincase until a time of convenience in which to change it.... )
Raveydavey wrote:Warkton Tornado No.1 wrote:
(I've long since concluded that primary compression, or the raising of it, is not something worth pursuing, particuarly when the engine is being run with good expansion chambers in conjunction with other tuning measures to raise power. I have known people run engines for thousands of miles with a blowing drive side oil seal & they just kept topping up the chaincase until a time of convenience in which to change it.... )
I did just that to get back from Poland. Used over a litre and a half
Warkton Tornado No.1 wrote:Raveydavey wrote:Warkton Tornado No.1 wrote:
(I've long since concluded that primary compression, or the raising of it, is not something worth pursuing, particuarly when the engine is being run with good expansion chambers in conjunction with other tuning measures to raise power. I have known people run engines for thousands of miles with a blowing drive side oil seal & they just kept topping up the chaincase until a time of convenience in which to change it.... )
I did just that to get back from Poland. Used over a litre and a half
Ha! Good to see a Kettering tradition continuing. Mind you, with your experience rolling off the throttle & nipping up, you are risking leaning off the carburation with any additional oil.
I would bet that you have Viton seals fitted
With all the scare stories about petrol additives, I researched the 'problems' of the effect upon Nitrile seals as I found Viton not so durable. (If memory serves, the independent (non-biased!) 'research papers' that I found were by an American organisation, probably SAE) I concluded that, all things considered, in the UK we are some way off the additives being an imminent threat to Nitrile, & as I had not had them leak, so continue using them, despite having Viton equivalents to hand. Personally, I think that two-stroke oil does a Hell-of-a-lot to obviate any likelihood of the affects of additives to our engines, a fact substantiated by it's use in older four stroke Classic vehicles to that & other issues that they encounter.
I reckon I may have heard you(!) going down Pytchley Road & guessing you use Tesco's top petrol, which is a good thing. I suppose it would be worth you fitting a new drive side bearing with seals fitted, when you get around to it........
Raveydavey wrote:It might have been me coming up Pytchley road. You can tell it's me by the noise
Warkton Tornado No.1 wrote:Raveydavey wrote:It might have been me coming up Pytchley road. You can tell it's me by the noise
'She' sounds really fit! VERY torquey, pulling from nothing, fuss free. You must be aching from grinning
I've never owned a SI or SII, but freely admit that the curvy bodywork has grown on me, & if the money & time were mine, I'd love to ride a passionate 'unrestricted' Seniorita ( ) once more, in two wheel form.....I must go for a lie down
As we are on the subject of seals, does your engine have the mag-side seal fitted? In other words, does it run the roller bearing in grease or petroil? Much depends upon the belief (or not!) in crankcase compression, but a reed valve engine such as yours might stand to benefit from having lower crankcase compression, which has the knock-on effect of giving the remaining drive side seal a slightly easier life. Just a thought, & nothing new to some of us
I hope this makes sense, but my belief is that if a crank is only a little twisted, then it will pump oil via the drive side seal journal, as you found, only over part of the rev range. Once the revs increase, & the crank starts to flex (as it should) then that appears to stop the seepage as the seal is 'too busy' coping with the flex to let oil past. That is partly the reason that I have gone back to Nitrile, because I believe that it's material properties enable it with more flexibility. I reckon that had your seal been Viton, it would not have endured so well as the Rolf seal!
Call me outspoken, or cynical, but there are a lot of products that people buy into because of unproven or ill-founded scaremongering, or simply the Kudos! I wonder if I am alone in considering that the profit margin of Viton over Nitrile might come into why they tend to be sold.....
The journals that oil seal lips run on should be a surface texture that can retain oil, to stop the lip from wearing out. Scotchbrite is our friend when we install crankshafts, rather than polishing. Sometimes, dependent upon which power transmission stockists I order from, some seals have arrived with twin lips, which I tend to keep for those journals that might have wear evident, reasoning that there should be a void of lubricant retained twixt the two.
Raveydavey wrote:
The mag side is the original S1 without a seal. The compression is high though. Have to stand on the level to kick it over. I guess time will tell if you are right no the seal material. I got about 7k miles before t his one started leaking and then ran it for another 2k miles before I fixed it so we'll see if we get as far as another 7 k before we fined out. Done about 1500 miles on it already.
Get an S1.. they are the best to ride. My SX doesn't get much of a lOok in anymore
neil64 wrote:Hello.
Seem to have quite a bit of smoke coming from scooter when running ,how do you check the drive side seal is good ?
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