Messages

Anyone know where to get a replacement for the pressed-in fuel inlet that the fuel hose fits over on a RD350 carb? 

Any significant difference between the Red Wing's and the Assault's?   

Equally crappy? 

Or these?

https://www.ebay.com/itm/360633097672

It seems like what I might need are the red wing KM-S320's, but of course those are nowhere to be found.

I am looking for decent shocks that will work on an rd350 with stock pipes.  So far this is the best I could come up with, but I'm afraid they might be a little long for stock pipes:

https://www.ebay.com/itm/360913720923

Is 320mm/12.5" about the length limit for bikes with stock pipes?

Any other suggestions for good options out there that perform better than stock, but aren't $300ea custom shocks?

If the rear cylinders run hot to a point of seize , just up the main jets on the rear cylinders 1 size , simples, don't open up the clearances! I worked on these machines in the '80's,
Once you re machine the bores you can't go back , your going about this the wrong way 
Read your first post you've written your measurements down wrong.
If you run at 0.01mm (4 thou) if will sound like a shite! , a bag of old nails

Barrie,
I think you might have been in a hurry.
.01mm is almost .0004 tenths of a thousandth, not.004 that you implied in your post.
Garrett is a very good machinist, also willing to machine to your needs.
I don't have the CNC machines that I once had due to a bad business partner for 9 years.
I can do cylinders as well, but due to the RZ500 heads are one piece its much harder to machine custom chambers without CNC mill. I have done them before when I had a gap bed lathe...
Chuck

I was kinda hoping for a response from you Chuck, since from the examples I've seen, you are very detail-oriented in your work. I appreciate the honest response about the limitations you have for cutting heads.

Just to be clear, I am not asking for advice on what clearances to run.

I'd like to know who is a skilled machinist able to set up a set of cylinders and heads to the specs I've chosen.

If your set on your clearances I can hone the cylinders to the specified size.

Shoot me an email and I can send examples of work.

Garrett
Gra2strokes@gmail.com

Thanks for the response Garrett! I am planning to shoot you an email.


I'm really not 100% set on those exact clearances I mentioned, but it is pretty much where I want to be. They were given to me by Rick L. and I understand the reasoning behind using them. And in my opinion, it is far more important that the bore is straight, round, and centered than worrying about the clearance being toward the upper end of the spec. The cylinders I have don't have perfect bores anyway, and will need to have some material removed regardless.

Just to be clear, I am not asking for advice on what clearances to run.

I'd like to know who is a skilled machinist able to set up a set of cylinders and heads to the specs I've chosen.

Those clearances sound a bit large , what does the factory specify .
I'll tell you what it says  0.060-0.065 mm or in old money  ( thou)0.0024 - 0.0026 "
So your clearances are miles out ! if what you have written is correct , in old money 2 and a half thou, so go back and recheck and read this !

http://www.rz500.net/RZ%20500%20REFERENCE/APPENDICES.pdf

Those are the specs I was going by. Notice in the piston clearance section it states a limit of .10mm/.004" ? The idea is to run more clearance on the seizure-prone rear cylinders.

Pistons are oem.

I am measuring with cheap telescoping gages and a Mitutoyo mic.

I am looking to have some work done on a set of RZ500 cylinders and heads. The cylinders are all on 1st overbore. The clearances (per my possibly error prone measuring) are generally a little tighter than I would like to run and I'd like to have the piston-cylinder clearances opened up to about .06mm on the fronts and .09mm on the rears. Currently I measure .04mm front and .06mm rear. I'd like to keep the bores as straight, round, and centered as possible. At least one cylinder also needs imperfections in the deck cleaned up.

The heads are a spare set I have that both experienced some sort of failure and have pitted domes. I would like to have the chambers cleaned up and the squish set with the focus on reliably running pump fuel.

Any suggestions on a good machinist for this?

I think this was asked on the old forum, but I'd like to resurrect the topic.

Is it acceptable to swap expansion chambers designed for one model onto a different bike? I have DGs for an RD400 (that were represented as RD350 pipes by the seller) and Factory Pipe 's for an RZ350. Would there be any issues with running either of these on an RD350 after relocating the mounts as necessary?

All of my Yambits rubber parts came within the last two years. The quality has held up since then.

That is good to know. Thanks for the info.

All of my Yambits rubbers fell to bits within months. (Foot rubbers, Kickstarter and gear lever). I now use economycycle and not had an issue.

I had seen similar reports, but they were mostly from a few years ago. When did you buy the faulty parts from Yambits? It is odd that you say the parts from Yambits were bad, but the ones from Economy Cycle were good since it looks like they share the same supplier:

http://pgmrubber.com/index.php?route=information/information&information_id=8

http://pgmrubber.com/index.php?route=information/information&information_id=9

Hopefully those reports of bad Yambits rubber parts are from a supplier that has been dropped and the PGM rubber parts going to Yambits and Economy (and HVC) are good.

I suppose those reporting good parts from Yambits received them fairly recently?

I need a pretty sizable chunk of replacement rubber parts to complete a couple of RD projects. The plan was to order most of them from Yambits since they have a bunch of other parts I need and the pricing on the rubber parts is good. Before ordering I did a little research on their stuff and found some not so positive reviews on the rubber quality. Thinking Economy cycle would be a good alternative I did a little research on them and it appears they use the same supplier as Yambits for rubber.

Can anyone give me some advice on sourcing rubber parts that won't fall apart after a couple years? Does HVC use the same supplier as the other two? If not, is the quality any better?

Anywhere else?