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Post by Kristjan on Nov 18, 2013 16:43:32 GMT
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Post by danm54 on Nov 18, 2013 22:23:10 GMT
They're not badly priced but I've never heard of them!
Whilst talking to Mr Upperton I asked about springs and he recommended a new set of stock springs. Apparently not all HD springs put the same amount of pressure as new stock ones. I guess if you know the seat pressure of stock springs you could find some with a higher or equal pressure.
What's special about the 95 cams? I remember reading they were better but can't remember how.
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Post by jaydee on Nov 18, 2013 23:05:34 GMT
I wouldn't chance putting in any brand I never heard of in a engine. I've read on other forums about APE valve springs breaking and they're a well known and respected brand. I've never heard a bad word said about Kibbelwhite springs which is what I'd be looking for. Who knows the spec of those that you have listed? Might be too weak a seat pressure or too much seat pressure from them which would hammer a camshaft.  |
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Post by Kristjan on Nov 19, 2013 10:58:58 GMT
Kibblewhite are good and many recommend to use them instead of stock items, but they come from US, so I would have to pay tax and that makes them a bit too expensive at the moment. But full KPMI spring kit with ti retainers would be nice, I think. Luckily there's not many things left in shopping list.
95 cams had less lift on exhaust cam if I remember this right, and have more midrange.
I'm afraid the other valves are heavier (will weigh them) and as I've seen 2 of these engines having valve float problems while being bone stock... then you know why I'm concerned. Although these were 18 and 19 years old and probably lost some spring pressure.
I had a look and found out that OEM springs don't cost much. If they are up to the job when fresh, then why not, need to buy other oem stuff anyway.
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Post by Kristjan on Nov 20, 2013 9:46:22 GMT
I contacted to the seller and was told that these SR springs are just repackaged KPMI springs. It may be true, as Star Racing sold busa springs that were KPMI under their name, too. They should be ok to use, then, I think...
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Post by danm54 on Nov 20, 2013 10:44:01 GMT
Will you be using a base plate for the springs? The KPMI set has them but I don't think they're there as standard are they?
They're only a few pounds cheaper than springs only from kpmi though including tax. Just you have shipping from the states to pay.
If you contact kpmi they have a list of suppliers, may be worth looking prices from those as well.
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Post by Kristjan on Nov 20, 2013 22:02:27 GMT
Ebay seller says that his springs will work with suzuki oem base plate and don't need anything else to install them. I'm not 100% sure, but aint the KPMI spring kit with dual springs, which makes the need for special base plates? If that's positive, these Star springs can not be the same product that KPMI offers.
When I last had a talk with KPMI about other stuff, they suggested to contact motospeed.se, who's their european dealer and looking at their site now - they sell the right springs without base plates for 161€. If they could get base plates, too...
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Post by kokolis on Nov 21, 2013 20:14:18 GMT
old and tired? how many miles?
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Post by Kristjan on Nov 21, 2013 21:57:33 GMT
The head I'll be using, I don't know it's mileage. Have to ask from PO. I do know that it has o/s valves, stock springs and ran 10k rev limit with no problems.
But is 50000 miles too much? Friend blew his bike up near this mileage. High revs, piston to valve contact.
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Post by kokolis on Nov 22, 2013 8:10:46 GMT
The thing is that valve springs other than oem have a harder rate, you don't want to use harder springs with oem cams.
You can test/measure your springs on load and/off free length.
If you don't go bigger, other cams, faster, oem springs are in most cases capable for outliving the rest of the engine
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