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I have the clymer edition of the shop manual and it has a descrepency in the maximum allowence of the bore size that says the maximum wear on a cylinder is 2.819 in. (71.6mm) and if the cylinder is beyond discard it, theres allot of meat on them left and theres ring and piston sets that are made for beyond the books limitation even a few pages further in the book but im not sure if i need to buy aftermarket cylinders or can i bore the stock ones? thanks everyone sorry im a nuub i looked but and didnt see it and i want to do my first bike right
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Any decent automotive machine shop can bore the cylinders for you.
As far as I know, the only oversize piston and ring kits options are by Wiseco.
I went to the 1179 cc kit .. but they have a 1196 cc kit too ..
http://www.wiseco.com
Do a search for
4069M07400 - 1179 kit
4069M07450 - 1196 kit1980 SG - "Blue Balls"
Complete Restoration - Finished June 21/2010
- 1179 kit
- 80/81 carbs 42.5/115 mains with XS pods
- Mac 4 into 1 exhaust
- Venture auto CCT
- progressive fork springs - no air
- Mike's progressive rear shocks
- Galfer S.S. Brake Lines
- XSDirect - Black Coils
- 8 mm S.S. Core Plug Wires
- T.C. fuse box
- TKat fork brace
- Geezer regulator
- Battlax BT45 V-Rated tires
- 5W40 - Rotella T6 Synth Engine Oil
- rest of bike is "good old Yamaha"
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An alternative is to find a "Parts Bike".want to do my first bike right
Some can be had for $50.00 to $200.00.
There is the chance that the top end could be FUBARed but
all the ones I found were still in spec..
Last engine I went thru I used the pistons and cylinders from the donor
bike which had good compression. . Replaced a few bearings that were marginable.
Fired right up and has several thousands of miles since done.
mro
PS: bummer to have top end problem on your first bike…Comment
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I'm not so sure about that. While most anybody can bore the cylinders, you'll search long and hard to find somebody with the 'torque plates' needed to do this right. It may not be that big a deal on these bikes, but I know on other engines failing to use these will result in out-of-round bores once the motor is assembled.Originally posted by Bullet View Post
'78E original ownerFast, Cheap, Reliable... Pick any two
'78E original owner - resto project
'78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
'82 XJ rebuild project
'80SG restified, red SOLD
'79F parts...
'81H more parts...
Other current bikes:
'93 XL1200 Anniversary Sportster 85RWHP
'86 XL883/1200 Chopper
'82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
Cage: '13 Mustang GT/CS with a few 'custom' touches
Yep, can't leave nuthin' alone...Comment
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I have the 1179 kit i was just tryin to clarify if i needed to buy new cylinders or not cus the book says that im beyond the limitation. So thats my question can i use the stock cylinders or do i have to buy aftermarket ones? the bore is the stage 1 kit cus the stock rings are short right now and im waiting to bore the cylinders again til i find out for sure i can use them. Can i bore stock cylinders?Comment
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Yes you can bore stock cylinders. The manual is referring to stock size pistons if you are out of spec that will not affect the big bore kit after you bore to fit your 1179 kit.BDF Special
80SG Vetter bagger 1196 Wiseco big bore kit, Mega Cycle Cams, slotted cam gears, ported and flowed head, bronze intake seats, Dyno Jet kit, Dyno coils and Mikes XS air pods, Venture cam chain adjuster,Geezer's regulator, Clutch mod, Mac 4 into 1 with custom built and tuned baffle, Oil cooler,MikesXS emulators mod.
Dyno tuned to 98 hp at the rear wheel.Comment
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thank you guys im gonna take them down in the morning and get them bored and start putting her back together. thanks again everyoneComment
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