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Old 11-01-18, 01:22 PM   #31
egcSV650s
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Default 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?
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Old 11-01-18, 01:57 PM   #32
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Default 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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Old 11-01-18, 03:06 PM   #33
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Default 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?
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Old 11-01-18, 05:04 PM   #34
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Default 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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Old 11-01-18, 05:32 PM   #35
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Default 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.
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Old 11-01-18, 07:17 PM   #36
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Default Re: 2005 SV650s Valve Clearance Question

Quote:
Originally Posted by Dave-the-rave View Post
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.
I originally measured the gaps in imperial but ive measured them again the other day in metric and here are the measurements

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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Old 11-01-18, 11:09 PM   #37
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Default Re: 2005 SV650s Valve Clearance Question

Quote:
Originally Posted by egcSV650s View Post
I originally measured the gaps in imperial but ive measured them again the other day in metric and here are the measurements

Front Cylinder
Intake - Both are 0.102 (use 175 in both)
Exhaust - One was 0.178 (use 170) and the other 0.152 (use 165)

For both the intakes i had 178 shimsin there and for both exhaust i had 175 shims

Rear Cylinder
Intake - Both are 0.063 (use 165 for both)
Exhaust - Both are 0.178 (use 165 for both)

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

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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Last edited by Dave-the-rave; 11-01-18 at 11:16 PM.
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Old 11-01-18, 11:54 PM   #38
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Default 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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Old 12-01-18, 12:14 AM   #39
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Default 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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Old 12-01-18, 12:18 AM   #40
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Default 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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