Messages

Looking for opinions/advice on adding boost ports on my '75 RD350.  The cutouts are already there on the liner, and I have the jugs off anyway.

I'm capable of basic backyard porting, but don't have a way to measure the angle of a boost port and am worried about making it worse than better.

I like your method of holding the exhaust plugs in for the leakdown - very clever.

Yes, I have bare pipes (not stainless) and all it takes is 5 minutes with WD-40 and a scotch brite pad every couple weeks.

Are they US/UK spec cylinders? I fought all sorts of jetting issues until I realized I had been sent India-HT spec cylinders.

^^^ Let's get a sound clip of that bad boy ^^

There's a nice '75 RD125 for sale locally that I can't get out of my head.  How practical is this bike for a regular rider for putting around town and backroad cruising at 55-60 mph.  Can it keep up with traffic?

How many of you have gone back to stock pipes after running chambers?

On my '75 RD350 I really only ran Wicked pipes, then threw the stockers on for the heck of it and was shocked.  I find them a lot more practical for around town riding, and even backroad cruising.  #1 for the sound and #2 for the tractable power.  Maybe it's just the Wicked pipes, but they have very little under 6k RPM, whereas the stockers pull like a tractor from about 4k. 

Granted I like the chambers for attacking twisties or a hard ride, but I kindof like the stockers for 75% of the riding I do.  I'm guessing the chambers add a good 5hp.

Here is my "butt dyno" comparison.

No photos, but he was asking $3,200.  It looked and sounded mint.

I was there on Friday.  Almost pulled the trigger on that RD125, and now really wish I had.

My '75 RD has developed leaks at both front tank mounts.

Looking for advice on any DIY repairs that don't involve welding, or do I just take it to a competent welder and be done with it?

BTW: your eBay link goes to the seller who sells the Kvedwulf supplied kits. I also bought 2 of these a couple years ago and paid about what you paid. The quality seems much better on these than others we've seen pictures of. Check out bottom side of cyl pictures and look at the sleeve match to cyl with no gap for example. I believe the sleeve looks thicker than others I have seen too. YMMV

Yes, the Kveldwulf, currently on ebay for $147 for the cylinders only, claim to be "Original US/UK specification" in the listing.

I bought 2 sets and the bores were all dead nuts, but the ports needed more chamfering.  I do not have a pair of true OEM's to compare the port specs to unfortunately.

Thank you, Mark!  Threads like this make this site a gold mine versus all the white noise in the fb groups.

Did this to a mildly modded 350B, and it made a nice difference versus stock cages & petals.  Removed a flat spot down low, and generally runs cleaner & crisper.

Very cool.  I would love to hear about the carb sync procedure...

^^^ Thanks.  The gold wheels are a nod to the '85 YZ's, which I always loved the looks of, and saved 4.7 pounds.  They're just the cheap Thailand versions from ebay, but they laced and trued up beautifully with the original spokes.

I'm at 32 pounds weight savings currently.  21 of that was just in the chambers, wheels, battery, ignition, and removing the centerstand.

Picked this up last Fall and went completely through it this winter.  With a few early spring shake down rides, everything is dialed and ready for the riding season.

As a lifetime Yamaha YZ guy on the dirt, I was always intrigued by the 2 stroke twins and finally got one.  It definitely hauls the mail, and the brakes are shockingly good.

Engine mods include Wicked Motorsports chambers, Vape ignition, cylinders decked for 400 head gaskets, ports cleaned-up, and reed spacers.