AllanB Posted October 26, 2015 Share Posted October 26, 2015 The forks on the old NVpainintharse feel a bit "squishy" in terms of shock absorption, how are they tested, please bear in mind there is no main stand on the bike, only a side stand leg? When I first bought the bike I had a local guy change the then weeping oil seals and refill them, but it could be that he did neither, just gave me a bill, as there seems little in the way of shock absorption. I dives like Jason Statham on any kind of front breaking, but there does seem to be some rebound damping, rather than a bang! If they are okay can anything be done to firm things up a bit on the front? Link to comment Share on other sites More sharing options...
properperson Posted October 26, 2015 Share Posted October 26, 2015 i though you were buying a 250M ?? Link to comment Share on other sites More sharing options...
pokerkid Posted October 26, 2015 Share Posted October 26, 2015 i thought you were buying a Benelli Link to comment Share on other sites More sharing options...
CarolJadzia Posted October 26, 2015 Share Posted October 26, 2015 (edited) If the fork seals were blown you would know because there would be oil on the forks, unless of course there is no oil - but that tends to lead to clucking when the forks bang on the stops. He may of changed the seals but not replaced the oil or possibly used the wrong grade of oil. Fork oil comes in different grades so you can change the dampening by using a thinner or thicker oil. However to do that you need to know what the grade of the current oil is. Edited October 26, 2015 by CarolJadzia Link to comment Share on other sites More sharing options...
Gonsalviz Posted October 26, 2015 Share Posted October 26, 2015 I recently changed the oil and seals in my HD forks. I don't pay HD prices so it was a search. I read on an HD forum that Ford Type F auto trans fluid was used with good result. Obviously, that is not available in Thailand so I bought Isuzu A/T oil. Works well. Can't say what oil you would need but that maybe a start. Link to comment Share on other sites More sharing options...
thaiguzzi Posted October 27, 2015 Share Posted October 27, 2015 If you can't get new or slightly stiffer fork springs, cut some pvc water pipe to give the tired springs more tension. Parallel each end. Try 1" first. As above, could try thicker fork oil ie 10w instead of 5w. ATF is generally good. Link to comment Share on other sites More sharing options...
thaiguzzi Posted October 27, 2015 Share Posted October 27, 2015 i thought you were buying a Benelli I thought he was buying a Lifan... Link to comment Share on other sites More sharing options...
pokerkid Posted October 27, 2015 Share Posted October 27, 2015 i thought you were buying a Benelli I thought he was buying a Lifan... Or was it a Honda .... Link to comment Share on other sites More sharing options...
properperson Posted October 27, 2015 Share Posted October 27, 2015 If the fork seals were blown you would know because there would be oil on the forks, unless of course there is no oil - but that tends to lead to clucking when the forks bang on the stops. He may of changed the seals but not replaced the oil or possibly used the wrong grade of oil. Fork oil comes in different grades so you can change the dampening by using a thinner or thicker oil. However to do that you need to know what the grade of the current oil is. Wize words as usual Carol - keep up the good work. Link to comment Share on other sites More sharing options...
AllanB Posted October 27, 2015 Author Share Posted October 27, 2015 Shortly after I bought the bike, there was just a tiny amount of seepage from one of the seals, dampness I guess you could call it. So I lifted up the plastic covers and ran a cloth around the oil seals to remove some dirt and that stopped it, but then had a local company change the oil. This started the weep again, so removed the forks and drained them, only to find new oil in one and old oil in the other. mmmm. Deciding on a full strip for new seals, I found a retaining clip at the top of the forks, which I couldn't get out, well actually didn't know how to remove it with the tools I had and asked another bike shop to fit new seals and new oil. That was over a year ago, no leaks and there is some damping, not sure how much there should be, but occasionally I hit a big bump (2up) and they bottom out...and as I say the bike dives more than I would like. I think I may have a go with ATF, I assume the oil seals are happy with that? No manual, so wondered what the oil level should be. Link to comment Share on other sites More sharing options...
CarolJadzia Posted October 27, 2015 Share Posted October 27, 2015 I think I may have a go with ATF, I assume the oil seals are happy with that? Automatic transmission fluid? I think that normally has a viscosity of 10W? Does your bike have that viscosity as standard? Why not look up the proper fork oil for your bike and start with that? Does not have to be the recommended make, just the right viscosity. http://rottenxxxronnie.blogspot.co.uk/2011/09/secret-world-of-fork-oil.html Link to comment Share on other sites More sharing options...
AllanB Posted October 27, 2015 Author Share Posted October 27, 2015 I think I may have a go with ATF, I assume the oil seals are happy with that? Automatic transmission fluid? I think that normally has a viscosity of 10W? Does your bike have that viscosity as standard? Why not look up the proper fork oil for your bike and start with that? Does not have to be the recommended make, just the right viscosity. http://rottenxxxronnie.blogspot.co.uk/2011/09/secret-world-of-fork-oil.html I found and downloaded a manual for the bike but it is in Portuguese and shows spoked wheels and chain drive, maybe options? The only mention for the forks is on a diagram is labelled "AJF", which could be a misprint. Anyway I think ATF is a good option and is thicker than general fork oil, which is what they will have used, as it isn't red. I have only seen fork oil here, no other spec. Thanks Link to comment Share on other sites More sharing options...
seedy Posted October 27, 2015 Share Posted October 27, 2015 Automatic transmission fluid? I think that normally has a viscosity of 10W? Memory serves - 7W Link to comment Share on other sites More sharing options...
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