Wiseco Piston Kit Query

[Anonymous]

I have asked this question before, so apologies if you've seen it already. Thought I'd try a different forum. This is for all of you who have a GS1000 with a 1085 kit:

I have fitted a 1085 Wiseco kit to my GS1000, and my question is: Is there anyone else out there who has done this and have they noticed any unusal noises afterwards?
I have had the kit in for 8000 miles now. Before that I had the same pistons fitted in a different engine(different block) and did 6000 miles on them.
The engine runs well, pulls like a train and burns no oil. However I get a slight knock from about 2500 rpm to 3500 rpm which gets better as the engine gets warm. This noise also occurred in the first engine.
Its fairly quiet and the nearest thing I can compare it to is a small end bearing gone. I didn't notice any problems with any of the bearings when rebuilding.
I am not too concerned, but I have heard that this noise is because the forged Wiseco pistons run bigger clearances and what I am hearing is in effect piston slap.
Hence why it gets quieter when the engine heats up.
Can anyone who's had a Wiseco kit verify this?

On a similar subject I have acquired a Yoshi 1085 (73mm bore) kit which has 3 ring pistons and I believe a 11.5:1 comp ratio.I am thinking of fitting this to my other GS1000. Is there anyone out there who's fitted one of these kits and can thay recommend it?


Thanks for your patience and help.

:mrgreen:

 

[Anonymous]

Well, I can't say I have any experience with either of these kits, as I just bought my gs1000 motor and still need to "beef it up..." but if you send it to me I'll use it for you. :lol:

 

[Anonymous]

Yeah, great idea, then you could........hey......wait a minute!!!!

Doh, you nearly got me there! Shucks! :lol: :lol: :lol: :lol: :lol: :lol: :wink: :roll:

Having read loads on the net I am now satisfied that my noise is normal forged piston stuff.

 

[saaz]

I run a 1085 MTC kit in my 78 GS, can't say the noises are unusual, byut then I have bumpy cams so it is a bit more mechanical. They have been in 18 years or so, so no reliabiltiy problems.

I knew someone who had a wiseco kit some years ago, no real unusual noises. These motors have noises that are fatal in newer bikes....just enjoy the music!

 

[Anonymous]

Agreed. I have stripped GS engines in the past which have numerous rattles and clunks, and have measured and inspected every part (I used to work on piston engines in the RAF) and found everything within spec, no measureable wear.
Thanks for the input.

 

[Anonymous]

Agreed. I have stripped GS engines in the past which have numerous rattles and clunks, and have measured and inspected every part (I used to work on piston engines in the RAF) and found everything within spec, no measureable wear.
Thanks for the input.

maybe we should have a contest to see who can describe the most annoying strange and confusing sounds that come from our gs motors 8)

 

[Hap Call]

maybe we should have a contest to see who can describe the most annoying strange and confusing sounds that come from our gs motors 8)

Mine is that deep rumbling noise that is always behind me...no, wait, that is the refried beans I ate last night!

Hap

 

[Anonymous]

maybe we should have a contest to see who can describe the most annoying strange and confusing sounds that come from our gs motors 8)

Mine is that deep rumbling noise that is always behind me...no, wait, that is the refried beans I ate last night!

Hap

THIS MEXICAN FOOD IS TOUGH ON YOUR INNARDS AS WE ALL HAVE COME TO HEAR :lol:

 

[Anonymous]

piston kit

piston kit

hi Brit you ask if anyone recommend a Yosh piston kit .my opinion is there are terrible and please send it to me immediately so you wont have to bear the burdon of owning it

 

[Anonymous]

I will take your advice under ...erm... advisement. :lol:

 

[Motorcyclemodeller]

Try taking off the stock automatic cam chain tensioner and replacing it with a manual cam tensioner, makes a world of difference.

Andre :idea:

 

[Anonymous]

Dr Dre, you got me interested, tell me more!

 

[Motorcyclemodeller]

When you start performance mods, the first thing to get rid of is the automatic cam chain tensioner. The rear cam chain guide will force the spring back under high load or pressure, resulting in noise, loss of power, and improper crankshaft to camshaft timing. It is a $40 dollar part and it is easy to set. You turn the motor clockwise by hand from the pickup side; to remove the slack from the rear cam chain guide. Then turn the adjuster in until it touches the rear guide; back it off a 1/2 turn and lock it in place with the set nut.

Here is a link to a pic:

http://www.hayabusazone.com/tensioner.html

 

[Anonymous]

Hi Brit.

I have a GS 1000 with a Wiseco 1100 kit in it, and no unusual noises at all. I certianly back up what that other guy said about the manual cam chain tensioner APE do one (I have this). Also you can get a beefed up rear tensioner guide that is so much better than the origional. My guess would be cam chain noise, the big pistons shouyldn't make any diference. A hint though, Wiseco claim around 10.5 : 1 for their kits. Load of rubbish. Should read about 9:1. If you skim the head, you can get some nice cheap horsepower, and real low down (read wheelstand) grunt. Add a set of 33mm Keihin Smoothbores and you really cook.

Currently my GS (race bike) is putting out 126hp at the rear wheel according to the dyno, but that is with flowed head, cams, 11:1 compression, 35mm smoothies, web cams, 4:1. Front whel comes up in first and second though!

Let me know if you want any details.

Cheers,

Smithy, Auckland, NZ.

 

[saaz]

I have a similar setup, but still have 28mm carbs on. Should have bought those smoothbores years ago.........

As it is, road manners are good with the smaller carbs, so I am happy enough

 

[Anonymous]

Thanks Smithy, thats great. Also Saaz.
Bloody right I would like some more details, as much as you can be bothered to give me. You can email me directly on gs7.11@virgin.net if its easier. Cheers.
I have recently changed my clutch plates and this has decreased the noise to some extent. Strange.
The bit about cam chain tensioners is interesting because I get some noise when blipping the throttle at a standstill up to about 4000 rpm. When the engine slows down I can hear the cam chain rattle.
As regards CR's with the Wiseco kit, I was surprised that I could use regular unleaded with no trace of detonation, now I know why.
How much should I skim off the head, enough to need Super unleaded, do you think?
I presume you are using the big port head? Can these carbs be made to run smoothly at low revs? I've always been put off by seeing my mates bikes coughing and fluffing round town.
Thanks again.

 

[saaz]

I run at least 95 octane in mine. can run on 92, but probably pings under power even if I cant hear it. In street use I could get away with it if I had to.

I run 1080cc MTC pistons, flowed head, 9.8mm lift cams, 28mm carbs, race pipe.

if the cam chain tensioner is not working properly, you will get chain ratttle after giving it a bit. I replaced mine with a later tensioner and service it. On track days it seems ok, but I don't cane it on the street (licence and stuff!!).

Mine is probbaly stronger than standard below 3000 rpm, but feels relatively gentle. Above 3000rpm it starts to feel rather strong....above 6000rpm its hang on! Street manners are fine, easy to ride in the wet in traffic and on slippery roads. A bit of carb tuning smooths it out down low

 

[Anonymous]

Fitted an 1150 Wiseco to my 1100. No more noise than any other 1100 only stacks more grunt...Slipping clutch.....Heavyduty clutchsprings fitted...Left forearm bulging....Have worn out a couple of clutch cables (might be my poor maint)....Heaps of fun for relatively little coin.

 

[humhead]

Piston slap?

Piston slap?

Have you tried a mechanic's stethoscope to pinpoint the exact origin of the noise? I am new to motorcycles, but when I put forged pistons in auto engines, some noise on warmup was considered normal. I was told this is due to larger piston to cylinder clearance necessary for forged pistons. Did you check your clearance?
I was wondering if you had some pictures available of the engine mounts on your bike. I'm planning on doing the same swap and would really appreciate a look.

Terry

 

[Anonymous]

Hiya all!
Also had the 1085cc Wiseco on one of my GS1000, had no problems at all, but one thing comes to my mind... My wifes GS750L 1979 had this funny knocking sound at idle... I searched all the normal places that I know sounds gome from, but couldnt locate the knocking.
I even adjusted the valvelash 3 times, but no result.
One day I was listening to this funny noise, I thought that the location was in the front of the head, grabbed on to the pinion/tachwire, and the niose
went away! Seems like there was a little damage being made when the cams had been put on, and the gear on the pinion was a little damaged...
Try to move the pinion by hand, maybe its the same?

Just a suggestion!