dps650rider

I was thinking, since the source of the heat in operation hits the liners first if the fit loosened up the liner would heat up more...

OK, good to know.

Is stainless OK for things like head nuts? I thought it had a lower tensile strength that steel. I one bought a set of steel engine...

Here is how mine is connected using a PMA and a shunt regulator rectifier. Please note that I have a series regulator rectifier but this...

As I said, the current going through the safety relay must go through the rectifier to complete the circuit. One thing missing in your...

But, the circuit is more complicated than that. This is not wired like a typical 3 phase system. The 3 outer coil connections go to the...

https://www.cruzinimage.net/2017/08/29/74-81-yamaha-xs650-706cc-bigbore-pistons-kit-78mm-447type/

Hard choice. I'm doing 706 pistons only because my 700 JE's and bores are worn out after 60k miles or so. 706 is the last size so I...

I was out a few times a couple weeks ago breaking in some new rings.

Got it done today, and everything works. Was able to tuck the relay under the battery strap. I'm still not quite satisfied with the wire...

The coil of the safety relay is powered by the alternator as per stock. When the engine starts the contacts close. Stock the safety...

Headlight operation remains identical to stock with the safety relay or the handlebar switch turning it on and it will not come on with...

And there is no problem shutting the headlight off.

Look at the drawing again, I am not losing the safety relay.

Attached is one idea I have to improve voltage to the headlight. I may even do this if the LED works out (find out tomorrow) because it...

This one. https://www.amazon.com/gp/product/B092SHMWQZ/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Or... the other option to try. I found a h4 led on Amazon with good reviews I'm going to try that draws 30 watts or a little less than 2...

Yep, the 78 wiring diagram sucks, best way to trace out the connections would be to print it on a large piece of paper and go over it...

Really the relays sound like the best solution. With that it would be better than new. BTW I did some more cleaning and tightening...

So for 18 gauge and an estimated loop length of 14 feet according to the chart I found the resistance would be about 0.091 ohms for the...

Yep very familiar with that in wire, worked as a bench tech in electronics repair for many years before moving to engineering. Suspect...

I was thinking about doing something exactly like that, I ordered some relays yesterday. But I am very curious to know if this is a...

Voltage drops under current are never 0, there is always some resistance. And yes I have started cleaning connectors and so far to no avail.

Battery is fine, 12.4 v with a 5 a load that ran for 5 minutes is ok and with the engine off. Starts just fine. But look at the voltage...

Even though I seldom ride after dark (too many deer in my area) I was looking into increasing the brightness of my headlight on my 78...

I have been running a 700 (77.5 mm bore) since 2008. Now it's worn and I'm going to 78 mm for 706 cc. That's the max.

Just checked with the shop that quoted 40 a hole last year, now they want 170 to do a twin.

One of mine rebuilt and welded in 2008 by Crankworks has the big end pins only welded, the other done a couple years ago by Hugh's has...

I had cranks in both of my engines welded to keep things from moving.

So I have yet another option to consider. Instead of boring that set of cylinders from 77.5 mm to 78 mm and using the Cruzinimage...

The guy I was talking to mentioned the difficulty of boring that amount. Hmmm, interesting. I'll check it out but I'm pretty sure he...

Talked to a guy at another shop and he said he could hone it from 77.5 mm to 78 mm. Don't really like the sound of that, I would think...

Should have mentioned, I'm using KibbleWhite springs and titanium retainers so I have reduced weight overall.

Yep, I'm trying to find a local shop I can trust to do a good job and I'd reasonable.

Yes. I think 0.030 on the intakes and 0.010 on exhausts. Not sure if I like how the valve seals sit on them now, going to look at this...

Eventually yes after destroying valve seals at high revs. This cam was supposed to be OK with stock guides but it was not the case...

Short seals on mine resulted in no clearance.

With the Porsche adjusters by the time you cone out the rockers and cut off the excess length I don't thing there is much increase I...

But, not Just curious, what are you going to do to get clearance to the valve seals?

More lift or less?

I looked up the last time I bored to 77.5 mm in 2007. At Boretech it was 290 but that was with the carbide treatment he offered. Don't...

I have been using them with a megacycle cam with .415 and .400 lift since 2008. Only problem I ever had was snapping one off using the...

He told me on the phone but I don't remember. I couldn't believe when he gave me that price. This shop has a good reputation but that...

Need to get a set of cylinders bored. Last year I got prices of 40 and 80 a hole from a couple shops. I just got a price from another...

BTW, the engine doesn't need to come all the way out to take the top end apart. I did it a couple times by lifting it up and setting it...

When I did mine I already had 1 Boyer so I machined off one end of the cam and added another. With this setup any angle is possible.

Here are some screen captures from a program I wrote that shows the relative vibration in the vertical plane in the form of an...

I doubt there is much difference between identically built 270 and 277's. I have been running a 700cc 277 since 2008 and have been very...

Oh my... I used to ride my dirt bike in the snow but not my xs. 😀

I have had 2 different 360 engines and 2 different 277 engines (built from the 360's) and the 277's are smoother under most conditions...