SuzukiSavage.com - up sizing bore

Dave

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Re: up sizing bore
Reply #15 - 08/13/14 at 12:07:33

Michael L wrote on 08/13/14 at 12:01:57:

Dave, that sounds awesome. Is the starter capable enough to handle the extra compression? Is the extra power enough, to be worth the price and work???

The starter can handle it....as long as the Decompression Solenoid or a manual lever is used to allow the engine to get some momentum built up. If the piston is on the compression stroke when the starter first kicks in...and you don't use the compression release....the starter stops and cannot push the piston up. That is why it is necessary to keep the compression release workable....either automatic as stock....or a manual version.

Dave

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Dave

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Re: up sizing bore
Reply #16 - 08/13/14 at 12:15:27

Michael L wrote on 08/13/14 at 12:01:57:

But, if the mechanics have measured it out, and advises you to get it rebored, then you have no choice but to listen to them, if they are reliable mechanics who isn't out to just score some quick cash, of course..

I am not convinced the mechanics measured anything........just that they believe there is a small ridge at the top.

Why don't you measure the piston/cylinder clearance? That is what we really need to know.
https://www.youtube.com/watch?v=ZVSd8-b0Ntk

Dave

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Jsud04 Full Member Offline SuzukiSavage.com Rocks! Posts: 223	Re: up sizing bore Reply #17 - 08/13/14 at 16:54:53 I just dropped the piston and head off at the machine shop. I will know by tomorrow...
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Jsud04 Full Member Offline SuzukiSavage.com Rocks! Posts: 223	Re: up sizing bore Reply #18 - 08/13/14 at 17:27:09 I am perplexed ... If I did a new piston what's to say and old valve might not snap and drop into my cylinder....I mean where dose this perfectionists madness end...
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LANCER Serious Thumper Alliance Member Offline Savage Beast Performance Parts Posts: 10661 Oklahoma Gender:	Re: up sizing bore Reply #19 - 08/13/14 at 19:15:18 Dropped valves are rare. It's not something I would worry about unless you have had problems with the valve gear already, and even then it would depend on what type of problem it was. If you wanted to replace with new parts for some reason... Intake valve: $32 Exhaust valve: $65 rocker set: $110 spring set (pr): $20 (Bikebandit)
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Dave

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Re: up sizing bore
Reply #20 - 08/14/14 at 04:17:57

Jsud04 wrote on 08/13/14 at 17:27:09:

I am perplexed ... If I did a new piston what's to say and old valve might not snap and drop into my cylinder....I mean where dose this perfectionists madness end...

Don't ask me.....I got a disease!

I tore my motor down when it had 1,262 miles on it because it was knocking. It turned out to be a loose flywheel nut - but I ended up installing new crank bearings, a new 95mm Wiseco piston, new valve seals, a Stage 1 camshaft, welded rockers, and did some port cleanup while I was in there. The bike runs really well.....but I certainly could have just tightened up the flywheel and motored down the road for a long, long time.

If you are going to keep this bike a long time - then do what you believe will keep you from worrying about the repairs. If you are going to sell the bike in a year or two.....then you may not want to be as picky.

You are in the same predicament that I was. You had some stripped threads that made you take the cylinder off to get the oil leak fixed....now you are working on a complete engine rebuild!

And worst of all - this is the best part of the year for riding...not wrenchin'.

Dave

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Jsud04 Full Member Offline SuzukiSavage.com Rocks! Posts: 223	Re: up sizing bore Reply #21 - 08/14/14 at 07:02:31 Yeah. I'll post more after they calk me today but I'm gonna likely bore it. Oh and they are checking the head to see if its warped as I had a leak into the cylinder at the head gasket at the intake side.
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Jsud04 Full Member Offline SuzukiSavage.com Rocks! Posts: 223	Re: up sizing bore Reply #22 - 08/14/14 at 07:05:20 The learning exeriance is priceless...
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Dave

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Re: up sizing bore
Reply #23 - 08/14/14 at 07:39:47

Jsud04 wrote on 08/14/14 at 07:02:31:

Oh and they are checking the head to see if its warped as I had a leak into the cylinder at the head gasket at the intake side.

That is not a hard one to fix. Tape a piece of fine emery cloth sandpaper onto a sheet of glass, and slide the head across it. It should shine up the head evenly across the entire surface. If it does not...then continue sanding until it does. If it requires a lot of sanding, you can switch to a coarser sandpaper for the heavy cutting and switch to the finer to get the bigger scratches out.

Dave

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