Recent content by dcracing

Re: My Suzi T500 Project (exhausting!) 8)

Re: My Suzi T500 Project (exhausting!) A slip roll, pair of vice grips, mandrel and plastic mallet and you're on your way. That's a whole bunch of welding there.

Re: My Suzi T500 Project (exhausting!) This stuff works pretty good

Re: My Suzi T500 Project (exhausting!) I haven't made lots of pipes but the ones I've done have been hand cut from 22ga. I'm far from a great welder and every mistake is magnified when there is even a tiny gap. Next ones will be laser cut for sure. About 3 hours to cut roll and weld these

Re: My Suzi T500 Project (exhausting!) That's all good stuff, thanks for sharing. We're on the same page with much of what you say, I think you just do a better job of explaining yourself than I ;D Everyone has their own way of looking at things of course. For example you mention Bimotion's...

Re: My Suzi T500 Project (exhausting!) That's what I was insinuating in another thread where I discussed re-shaping an R5 head. In some cases air flow (charge in a combustion chamber) seems to like a hard transition rather than a radius. Not always the case as I'm sure you know, knife edges...

Re: My Suzi T500 Project (exhausting!) I know through experience that a longer header produces better low and mid range power at the expense of some top end.While I cannot prove it I believe that the tapered header allows a smoother transition from head pipe to divergent cone which allows for...

Re: My Suzi T500 Project (exhausting!) Really?

Putting in a six speed is easy, basically swap the whole tranny, drum and all, from an RD. One thing I'd do with an R5 head if I were having it machined is eliminate the radius at the edge of the squish band, make it a sharp corner.

If you have access to a competent machinist familiar with 2 strokes the heads can be repaired and improved. Some changes to the squish band / combustion chamber transition would be worth doing IMHO while achieving prooper squish clearance and combustion chamber volume. R5 cylinders are around...

Re: Re: Re: Rookie Yamaha R5 engine rebuild I almost always replace outer bearings, regardless of how good the crank looks once, I have it out. It's easy. The only exception is if I know they're already pretty fresh. TBH I don't worry much about the case bearing surface unless it looks...

Re: Re: Rookie Yamaha R5 engine rebuild RDs use a roller not a plain bearing

I don't know what that spec would be, other than comparing to the bearing o.d., or how one would measure it with a micrometer, short of bolting the cases together and measuring the bearing surface bore with an inside mic but I've never seen the need to do this. I've seen bearings spin in the...

You've never seen a 40 year old crank rebuilt at some time with non pin bearings? I have. No pics of the crank and I don't like to assume it's original. Still unsure how you'd "mic the crank bearing surfaces"

Re: My Suzi T500 Project (exhausting!) Curious as to why you chose to do parallel wall headers? Tapered head pipes have long been known to provide better performance.