bajjer9 Posted June 13, 2007 Share Posted June 13, 2007 Well my brother just finished putting the engine back in my bird and checking the valves. Thought I would post up the measured gaps. Not bad for a 10 year old bike with 94k on it? Valve Cylinder 1 INT .002 .003 EXH .007 .006 Cylinder 2 .002 .002 .006 .007 Cylinder 3 .002 .002 .008 .006 Cylinder 4 .006 .007 .007 .007 Quote Link to comment Share on other sites More sharing options...
MontanaXX Posted June 13, 2007 Share Posted June 13, 2007 Nice. The longevity of these Blackbird valvetrains relieves me of much stress when it comes to touring. Quote Link to comment Share on other sites More sharing options...
scottw Posted June 13, 2007 Share Posted June 13, 2007 Interesting. Normally the clearance tightens up on the exhaust side. Does anybody know how the clearance changes as the engine reaches operating temperature??? Increase or decrease?? It looks like it, as least doesn't change much or it increases, as in this instance some intake would have been held open. Quote Link to comment Share on other sites More sharing options...
tomek Posted June 14, 2007 Share Posted June 14, 2007 Wait a second,those intakes are tight like MoFo, 0.002 inch, it is about 0.05 mm ,right ?, or am I wrong ?.I did pull my cylinder head at 94 k miles,clearance was in spec,but valves and valve seats is a different story. If it is really 0.05 mm clearance on intakes, with those miles there is a good chance valve`s sealing area and seats are damaged. Those exhausts are almost too tight,but I don`t have manual here,,,,,,, Quote Link to comment Share on other sites More sharing options...
XX4me Posted June 14, 2007 Share Posted June 14, 2007 I think your right. It should be .19mm - .22mm - .25mm for exhaust valves .13mm - .16mm - .19mm for intake valves I recently did mine. Starting Measurements EX #1 - .20mm EX #1 - .20mm EX #2 - .23mm EX #2 - .23mm EX #3 - .23mm EX #3 - .23mm EX #4 - .20mm EX #4 - .18mm IN #1 - .13mm IN #1 - .15mm IN #2 - .13mm IN #2 - .13mm IN #3 - .13mm IN #3 - .15mm IN #4 - 13mm IN #4 - .13mm Final Measurements EX #1 - .23mm EX #1 - .25mm EX #2 - .25mm EX #2 - .23mm EX #3 - .25mm EX #3 - .25mm EX #4 - .23mm EX #4 - .23mm IN #1 - .18mm IN #1 - .18mm IN #2 - .18mm IN #2 - .16mm IN #3 - .20mm IN #3 - .18mm IN #4 - .16mm IN #4 - .16mm IN #3 is .01mm wider than the suggested service limit of .19mm, but I would rather have it loose than tight. Besides I ain't taking it apart again for .01mm. The Hot Cams shim kit I used only had shims in .05 increments, makes it a little trickier. Quote Link to comment Share on other sites More sharing options...
MontanaXX Posted June 14, 2007 Share Posted June 14, 2007 IN #3 is .01mm wider than the suggested service limit of .19mm, but I would rather have it tight than loose. Besides I ain't taking it apart again for .01mm. The Hot Cams shim kit I used only had shims in .05 increments, makes it a little trickier. I thought if you had to choose between slightly tight or slightly loose that loose was better because you want that valve to close completely not be held partially open? I have read you can burn a valve seat from tight valves, is that true? Quote Link to comment Share on other sites More sharing options...
bajjer9 Posted June 14, 2007 Author Share Posted June 14, 2007 my brother did the work and he use to work for honda till this past month and now works at suzuki. He said all were within specs according to the manual with a couple close but not outside..runs good and compression is good...wouldnt failing valve seats show up on a compression test? Quote Link to comment Share on other sites More sharing options...
XX4me Posted June 14, 2007 Share Posted June 14, 2007 IN #3 is .01mm wider than the suggested service limit of .19mm, but I would rather have it tight than loose. Besides I ain't taking it apart again for .01mm. The Hot Cams shim kit I used only had shims in .05 increments, makes it a little trickier. I thought if you had to choose between slightly tight or slightly loose that loose was better because you want that valve to close completely not be held partially open? I have read you can burn a valve seat from tight valves, is that true? but I would rather have it loose than tight. That's what I meant to say, cause your absolutely right. Quote Link to comment Share on other sites More sharing options...
scottw Posted June 15, 2007 Share Posted June 15, 2007 my brother did the work and he use to work for honda till this past month and now works at suzuki. He said all were within specs according to the manual with a couple close but not outside..runs good and compression is good...wouldnt failing valve seats show up on a compression test? According to my '99 Manual, the clearance specs are .006" +/-.001" for the intake and .009" +/-.001" for the exhaust. Things look a little tight all around. Quote Link to comment Share on other sites More sharing options...
MontanaXX Posted June 15, 2007 Share Posted June 15, 2007 but I would rather have it loose than tight. That's what I meant to say, cause your absolutely right. Whew, for a while there I thought my memory and loose hold on mechanical factoids was failing... On a side note, I have to adjust the intakes on my 450 dirt bike about every 15 to 20 hours because they get tight. The exhausts don't move much after they set. I start with them at the loose end of spec and then adjust them again when it starts running crappy. I understand those valves in that single are just pounding there way into the seats. Glad my Blackbird isn't like that. Quote Link to comment Share on other sites More sharing options...
bajjer9 Posted June 15, 2007 Author Share Posted June 15, 2007 Thanks guys, definately gonna ask him what he was smoking...so much for trusting relatives.. Quote Link to comment Share on other sites More sharing options...
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