Freebird Posted September 17, 2006 Share Posted September 17, 2006 HiI've just bought an early 2.5 PI engine to replace the tired 2.5TC lump in my Vit.The PI unit came without a distributor, with I believe should be a 25D6. Can I use the TC Dizzy 45D6 or not?Anyone got a 25D6 knocking about?Glen. Link to comment Share on other sites More sharing options...
Glenn Posted September 18, 2006 Share Posted September 18, 2006 Hi,For what it's worth - I think the 45D6 would be fine. You wouldn't have the vernier but I don't suppose that matters.The centrifugal weights might give a slightly different advance curve but I'm sure it would run ok.Glenn Link to comment Share on other sites More sharing options...
Deleted User Posted September 18, 2006 Share Posted September 18, 2006 the 45D has 10 degree bob weights the 25D has 13 dgrees thus if you were wanting more advance at the top end use the 25D but depends on the cam,mixture etc etc The strength of the springs control the timing curve ie how much advance at a certian rpm- have a look for an old thread in this section think I posted up some numbers a year or so ago when I was tinkering with them!If you are sticking to standard lump on carbs should be fine with 45D if you start tweeking get the file out and a big box of springs to mod the curve to something close then take it to the rolling road who will get it spot on Link to comment Share on other sites More sharing options...
Deleted User Posted September 18, 2006 Share Posted September 18, 2006 I have got a 25d kicking about but no springs for it-you can make your 45d match the curve on the 25D just need the right springs and mod the bob weights to allow more advance at the top end Link to comment Share on other sites More sharing options...
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