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11-01-18, 01:22 PM | #31 |
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Re: 2005 SV650s Valve Clearance Question
I meant when i took the rear cams out i took a picture of where the markings were and lined them back up where they were in the picture but ill just do what youve said to properly time the rear. Is it best using a toothbrush to push the chain up while turning as dont want fingers getting caught.
Whats the actual explinarion behind it all then? Like how comes you can measure the gap on R but have to rotate the engine to F for removal? Is it just because its easier to see where the timing marks are? |
11-01-18, 01:57 PM | #32 |
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Re: 2005 SV650s Valve Clearance Question
Theoretically if you put the rear cams back exactly where they were regardless of timing marks, it would be fine.
Personally I'd do it the correct way so as to avoid expensive mistakes. Hold the cam chain in your hand at the top, keeping enough pressure on it that it stays on the bottom sprocket as the crank/sprocket turns. Basically you're using your hand as a top sprocket. The reason behind it all has to do with firing sequence of the cylinders and V twins are all a bit odd in that regard. Also it's important to take out and install camshafts when they arn't pressing down on the valves. ie valves are fully closed. Using the correct timing marks makes visualisation easy. It means the valves are fully closed, and it also allows chain slack to be on the side of the tensioner, so that tensioner can take up the slack. Using the F for front and back is a bit counter intuitive but that's how it is. Some engines are odd. My XV750 crank shaft runs backwards. When you have got it all timed and bolted down turn the engine slowly by hand a few times and stop if you feel any metalic resistance. If all is well and front and back timing marks are lining up when they should then re check the valve gaps and write them down. That's when the F and R marks are used.
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11-01-18, 03:06 PM | #33 |
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Re: 2005 SV650s Valve Clearance Question
Ive taken the cams out while on R, so by what your saying ive taken them out when the valves arent fully closed, will that damage the valves?
Makes sense now that youve explained it all, thank you for that. Regards to the shims as i need to order some, ive used the chart that someone kindly posted earlier and it goes up it 005 but some of my shims are 172 and 178, so when im seeing which shims i need do i round the 172 to 170 and the 178 to 180 as i need to see which shims i need to get? |
11-01-18, 05:04 PM | #34 |
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Re: 2005 SV650s Valve Clearance Question
Your valves will be fine as long as it's put back together right.
The 172 and 178 are factory shims it's not a problem. You can only buy shims in 005 as you have noticed. Seems you measured your gaps in Imperial which isn't helpful so I've converted them as best I can. Front Cylinder Intake - [.004] 0.102 [.0035] 0.089 Exhaust-[.007] 0.178 [.007] 0.178 Rear Cylinder Intake- [.0025-.003] 0.069 [.0025-.003] 0.069 Exhaust [.007] 0.178 [.007] 0.178 So by my calculations all your valves are tight except one intake which is right at the edge. Now I'm not too happy about measuring a metric bike in imperial then converting to metric. Not with feeler gauges and such small values. Here's your options.... Trust the conversion will work ok, calculate which shims you need using the chart and get the rear cylinder buttoned up, before moving on to the front. OR Assemble the rear cylinder, timed correctly and re measure both cylinder valves using metric feeler gauges. If you go with the first option I cant tell you which new shims you need because I don't know what shims were in there. The chart on the second page of this thread shows you how to calculate. Basically all your valves are tight so you need to go down in shim sizes. That makes for a bigger gap. If in doubt let us know what shim size corresponds to each of the above measurements. Don't be disheartened. You'll get there.
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11-01-18, 05:32 PM | #35 |
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Re: 2005 SV650s Valve Clearance Question
Putting it back together exactly as you found it only works if it was correct in the first place, use the marks!
In theory it doesn't matter where you measure the gap, or where the cams are when you remove them, as long as the heels of the cams, and not the lobes, are at the buckets, but again use the marks! Oh, and get yourself some metric feelers, one less hassle and probably more accurate than converting. No need to remeasure the gaps with metric if any hassle, just use metric for the final check. And very good advice to rotate the engine carefully/manually a couple of times before putting the valve/cam covers back on, you can triple check the timing marks and the clearances at the same time. |
11-01-18, 07:17 PM | #36 | |
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Re: 2005 SV650s Valve Clearance Question
Quote:
Front Cylinder Intake - Both are 0.102 Exhaust - One was 0.178 and the other 0.152 For both the intakes i had 178 shims in there and for both exhaust i had 175 shims Rear Cylinder Intake - Both are 0.063 Exhaust - Both are 0.178 For the intake i had one shim at 172 and the other 175 and for the exhaust i had one shim at 170 and the other 172 |
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11-01-18, 11:09 PM | #37 | |
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Re: 2005 SV650s Valve Clearance Question
Quote:
Now if I've done me sums right you only need to buy 5x165 shims because you can already have 2x175 and 1x170.
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SV650N K1 Last edited by Dave-the-rave; 11-01-18 at 11:16 PM. |
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11-01-18, 11:54 PM | #38 |
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Re: 2005 SV650s Valve Clearance Question
Great, thank you so much, youve been a life saver. I will get those ordered straight away. One other question, when i was taking the chain tensioners off, if im correct there should be a gasket once i take the tensioner off but there wasnt on front or rear, is there meant to be gaskets there?
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12-01-18, 12:14 AM | #39 |
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Re: 2005 SV650s Valve Clearance Question
Yeah it will either be stuck to the tensioner or the head, or both if it's ripped apart. Unlikely there's non there.
Order two new ones along with the shims from Robinsons Foundry.
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12-01-18, 12:18 AM | #40 |
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Re: 2005 SV650s Valve Clearance Question
Ahh right ill have a look tomorrow. I normally order from Fowler Parts will that be ok still? Thank you so much for your help
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