Wiseco Piston Kit Query

[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?

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!

[Anonymous]

Re: 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

I'm fairly happy now that the noise I'm getting is normal for forged pistons, as you say.

Email me on the address in the post above and I will reply with some pictures of the engine mounts.

[Anonymous]

Hiya all!
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!

I had this too, on my bike when it had a 750 engine. The exhaust cam was damaged on the tacho drive gear. I fixed it with a good used cam.
Good point.