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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> up sizing bore /cgi-bin/YaBB.pl?num=1407947325 Message started by Jsud04 on 08/13/14 at 09:28:45 |
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Title: up sizing bore Post by Jsud04 on 08/13/14 at 09:28:45 If I step my bore size up will I need a new sized head gasket? |
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Title: Re: up sizing bore Post by Dave on 08/13/14 at 09:34:30 Nope.....the head gasket will work with the stock 94, or the DR 650 pistons that are available in 95, 96 or rare 97mm bores. Dave |
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Title: Re: up sizing bore Post by Jsud04 on 08/13/14 at 09:44:56 So its got 20000 miles on it. The lip in the cylinder is very slight. But the shop that I took it to get honed at says that I should really bore it and go to the next size up otherwise I run the risk of tapered cylidar, slap, or other crap...thoughts? |
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Title: Re: up sizing bore Post by Dave on 08/13/14 at 09:54:52 033A3C2D2C3B3A797D490 wrote:
I think that without some measurements, photos or hands on activity....we can't provide any information that is accurate. Why did you take the engine apart? Dave |
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Title: Re: up sizing bore Post by Jsud04 on 08/13/14 at 10:08:37 Leak from stripped oil galley bolt... |
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Title: Re: up sizing bore Post by Dave on 08/13/14 at 10:18:16 Well, 20,000 miles is not a bunch on the bore. Youzguyz has 100,000+ miles on his and it is still on the original piston and rings. The only thing I can suggest is that you use a feeler gauge and check the clearance between the piston and cylinder. Check on the front or back of the piston near the top of the bore. (Don't check the sides or at the top ridge). If the piston to cylinder wall clearance is excessive...then it is time for a piston and bore. Dave |
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Title: Re: up sizing bore Post by Jsud04 on 08/13/14 at 10:24:16 Well...the cost of the rebuild now vs doing it again is leaning me swords new piston and bore... |
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Title: Re: up sizing bore Post by Dave on 08/13/14 at 11:06:13 Well....then you got to decide. Overbore with stock piston....or Wiseco? Wiseco is more power, and the use of Premium fuel now and forever. Dave |
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Title: Re: up sizing bore Post by Jsud04 on 08/13/14 at 11:10:40 Where can I get an over sized stock piston? What would you choose. |
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Title: Re: up sizing bore Post by Michael L on 08/13/14 at 11:16:25 For me, the choise would be obvious.. Next bore size with wiseco.. But if you're not the type for more power, then ofcourse there's no need to put the extra stress on the engine, so just go with a standard piston.. Atleast, with just the new bore and whatever piston you choose, with good maintenance, the bike should give you many many miles.. Considering that the cyllinder and piston basically would be as brand new.. I think you would have more peace of mind once everything is back together, knowing that you got it bored with new piston.. It's definitely worth it.. |
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Title: Re: up sizing bore Post by Michael L on 08/13/14 at 11:22:51 Get in contact with a shop who can order genuine suzuki parts.. ..Im wondering.. how much difference does it give in feel of performance, with just a wiseco and no bigger bore..? Not trying to hijack your threat, but I thought you may wanted to know too ;) |
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Title: Re: up sizing bore Post by Dave on 08/13/14 at 11:33:22 487732313434040 wrote:
You don't have the option of a Wiseco with a 94mm standard bore. Wiseco doesn't make a piston for the S40/LS650. They make a piston for the DR650 that just happens to work in the S40/LS650.....with a stock DR650 95mm size, or an oversize 96mm...or 97mm by special order in bulk. I used the 95mm in my bike - and it does make the bike accelerate faster and when you roll off the throttle....it slows down faster. I like it!...but it may not be right for everyone. The compression is bumped up from the stock 8.5:1 to around 10:1....we don't know for sure as all the compression data is most likely for the DR650 which has a different head. All we know (or care about) is it works. Dave |
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Title: Re: up sizing bore Post by Jsud04 on 08/13/14 at 11:42:26 Well a bore out is 85 dollars and a piston is 178... So 263 plus tax...or just hone and new rings for 25...seems like you would spend the $ and do it now while I got it down... |
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Title: Re: up sizing bore Post by Jsud04 on 08/13/14 at 11:47:16 I should add a honing is 85 as well |
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Title: Re: up sizing bore Post by Michael L on 08/13/14 at 12:01:57 Well if it isn't nessesary, why not save the money.. 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, ofcourse.. Lancer on this forum once offered big bore kits, don't know if he still does. I don't remember the price either, but you could look into it and see if it's worth it for you. Dave, that sounds awsome. Is the starter capable enough to handle the extra compression? Is the extra power enough, to be worth the price and work??? |
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Title: Re: up sizing bore Post by Dave on 08/13/14 at 12:07:33 7A4500030606360 wrote:
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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Title: Re: up sizing bore Post by Dave on 08/13/14 at 12:15:27 1C2366656060500 wrote:
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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Title: Re: up sizing bore Post by Jsud04 on 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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Title: Re: up sizing bore Post by Jsud04 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... |
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Title: Re: up sizing bore Post by LANCER on 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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Title: Re: up sizing bore Post by Dave on 08/14/14 at 04:17:57 556C6A7B7A6D6C2F2B1F0 wrote:
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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Title: Re: up sizing bore Post by Jsud04 on 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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Title: Re: up sizing bore Post by Jsud04 on 08/14/14 at 07:05:20 The learning exeriance is priceless... |
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Title: Re: up sizing bore Post by Dave on 08/14/14 at 07:39:47 487177666770713236020 wrote:
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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