GS1100G Road Runner Project

[londonboards]

Nessism - From the picture above, I was taking a reading from the right hand side of caliper. So in this case it shows a considerable gap, which I closed up by bending the tab.

I agree the photo suggests that I am happy with the measurement (if it was taken to the left of the caliper) which shows it would be spot on.

I should have posted this picture:



Thank you for pointing that out. It's nice to know that someone is taking that much interest and is willing to help me out.

Greetings

[londonboards]

Hampshire - Thanks for that. Indeed I am releasing little critters from all over this bike!

What do you think about this brake piston:









Greetings

Richard

[londonboards]

Eil - Yes I have no idea what has caused all that. My guess is that it is brake fluid that has congealed along with corroded calipers.

But the good news is that underneath it all I still have serviceable parts.

Greetings

[steveb922]

That piston is corroded in the area which passes across the piston seal. There is a possibility that it will damage the seal and allow brake fluid to escape from the system. I would replace it. You might want to consider stainless steel parts.

[Nessism]

Those pistons are junk. Time for new ones.

Oh, and good news about the float height. You are doing nice work.

[Charlie G]

Following along still. I agree on the great photos. Nice to have these guys here to coment on your work. That's the one thing that makes working on these bikes possible for me.

cg

[GateKeeper]

Great post and all but.....

do make the pictures a wee bit smaller, say 800X600

this will still give you good sized pictures but will not have them so wide that one has to scroll sideways on the page to see the entire pic...

just a thought...

.

[londonboards]

Gatekeeper - yes you are right. In those last few posts I took copies of the wrong size photos. Sorry about that.

My other GS1100G (My Dad's Bike) came from Burlington, Ontario. We bought it new there in 1985 from the Suzuki dealer on the South Service Road just off the QEW. Now being restored!

Greetings

[londonboards]

Do I Replace Those Brake Pistons?

It seems like the sensible thing to do. Just replace the pistons. And as it happens I do have the pistons "in stock" as I have bought some for my other GS1100G project. I would prefer not to use those as they cost me nearly $100 and I am having to reign in the spending (it's totally outta control!!).

And if you read the tutorial on Bass Cliff's site, he has re-used pistons in a worse state.



Oh dear what should I do?

[steveb922]

I think there's a difference between some surface rust and the sort of pitting shown in your photos. Personally, I would play safe and fit new. Quite apart from the safety aspect, it may save you having to strip the caliper again after a short time.

I notice you priced the last set in dollars - is there no UK supplier you could use?

[Agemax]

i would NOT use the pistons shown in that pic. they will soon tear up the seals and cause problems. if yours look like that Richard, replace them!

[londonboards]

Steve - I priced in Dollars to our US friends would get the price.

I actually live withing 500 metres of Robinsons Suzuki. Problem is their prices are so high. I have often found it cheaper to source parts from the US - even with extra postage charges. The new brake pistons I have in stock came from Canada.

Greetings

[londonboards]

Agemax - thanks for that Adrian. You are right I should use new ones. I think the poor state of the brakes when I took them apart (all that white powder) was in fact due to the seals leaking (because of crap pistons) and depositing brake fluid all around.

Sound advice. Requesting prices tonight.

Greetings

[steveb922]

Understand your point re Robinsons! I just bought a set of stainless pistons from Wemoto - just under £60. The pistons and seals were good quality, but the boots were rubbish. Fortunately my old ones were ok to re-use.

[hampshirehog]

send Nick Chambers (RD bitz) an email:

http://www.rd-bitz.co/contact.htm

He sells stainless pistons for loads of bikes, not just Yams, and he's half the price of anyone else I've found. Good service as well.

And another confirm on those old pistons - paperweights only now.