Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - alexbrown64

Pages: [1] 2 3 ... 41
Honda / Re: New XR75 K1 1974 Project
« on: December 05, 2017, 10:48:39 PM »
I am working away at the moment, but picked up the engine from Richard at Pipe Kings before I left.
He did a good job of repairing the broken engine footpeg mount. The left mount in the pic was completely snapped in half.
The other repair with all the meat on it was there when we got the bike.  We couldn't repair that one, for fear of creating a leak from the gasket. (it doesn't leak oil at the moment believe it or not)
For now we are just getting the bike up and running properly.  In a few years when I tear the bike and engine down, we will repair the "repaired" weld to take it back to original.

I should get the spokes soon and a few other small parts.. then its a bit of paint, cleaning, greasing and start the assembly process which will be fun.


General Discussion / Re: Scam at another level
« on: November 30, 2017, 10:35:14 PM »
I think id rather get taken by the blue sapphires than the blue veiner  :o  :o

General Discussion / Re: Scam at another level
« on: November 30, 2017, 10:00:15 AM »
Great story and amazing scam. The Thais are pretty good at that sort of thing. I bet you will be doubling down on your security after that one.
I nearly got scammed in Thailand as a young backpacker with the old blue sapphire switcheroo..


Yamaha / Re: YZ125K Rebuild
« on: November 29, 2017, 11:45:02 PM »
Thanks for all the input guys. I'm working away for a while so I've had to put the bike aside. I did achieve a bit though. I reassembled the engine with another new piston kit, and took the lot up to get measured and checked over.
Also ordered a genuine stator and coil, and have a spare Yamaha cdi.
Will do leak down test, timing light check and use my new standard size carb with Yamaha spec jets. The newer Mikunis may be a whisker different, but I am sure I will be in the ball park.
I will do all these mods, together with the recommendations and mods that Ray Easson is doing in regard to squish and compression.
Hopefully I will have a runner in the new year..

Updates later...

Yamaha / Re: YZ125K Rebuild
« on: November 24, 2017, 11:11:06 PM »
I do sleepy and here it is.
Genuine 1983 YZ125K ignition curve and info. The reference point is set at 1.88 btdc using 50mm stroke and 98mm rod length.

Some other updates.  I have my new genuine Mikuni 34 to replace the 36. I have just ordered all the jets to get the original 34mm size carb back to stock.  290 main, 65 pilot, 6f21 jet needle.  Got these from nichecycle who have nice low shipping charges and have some hard to get bits.

Also lined up a genuine stator and coil.  Will use my original Yamaha rotor and cdi. But had to order a cdi rubber holder and rotor woodruff key from partzilla.  Partzilla also has really cheap shipping.  Only $6 from US.


Honda / Re: New XR75 K1 1974 Project
« on: November 24, 2017, 07:47:17 PM »
Hey Scotty,

No, i have not done that mod but it sounds like a good one.  When i took the XR for a test blat, the steering was fine.  I disassembled everything and it was clean and OK.  All i have done is order anther 10 ball bearings (i think there are 42) just in case some went rolling off or are knackered.  Clean her up, plenty of grease and she should be good to steer for another few years...


Yamaha / Re: YZ125K Rebuild
« on: November 24, 2017, 07:28:06 PM »
Hey Sleepy, the piston did show signs of detonation. It was all melted around the tip and was black underneath.
Yep, my G back in the day had a stater that went bad... bike just run like shit though.

This is what PVL has sent me and says it cdi 537202 with the 5000 windings stator.  I can't make heads or tails of the diagram.  Would i add my 16* to this or is this based on some sort of base setting with the bikes static advance already set?  I think the guys i am talking too are German, because i cant seem to get any straight answers.  I ask them what parts are suitable for my bike, and they waffle on about "change the setup from the ignition".  Hmmmmm

Ive put an add up on facebook asking for a K genuine igniton setup.  Half my parts are junk or missing. Anyone have a full K ignition? I need stator, rotor, cdi and coil/plug lead/cap.  I am fedup with trialing PVL's box of parts....and may just put them up for sale. I have coil 466-100, rotor 9918, stator 1013 110mm, cdi 537-202.
I was also thinking HPI, but at the moment i just want to go standard and make sure the bike doesn't go kamikaze on me again.


Yamaha / Re: YZ125G Build
« on: November 24, 2017, 03:28:27 PM »
Finally finished the frame and can post some pics. Came back from powder coaters in almost mint condition. After all the work i had done, they blasted, zinc primed and gloss black powder coated the frame. 
There were i couple of minor imperfections which were touched up with 2k gloss... and then it was ready to wipe down, mount on its bike stand and take some pics..

This G now has a decent base to start the rebuild. 


Yamaha / Re: YZ125K Rebuild
« on: November 24, 2017, 02:18:26 PM »
Yep Ralph.  I got another email from PVL saying the curve is a combination of stator windings and the CDI.  They can't give me the curve for my 3000 windings (they call them winches) stator, but they are sending me the curve for the cdi i have with the 5000 windings stator. As loss said, my 3000 stator probably advances the the curve.
I took the motor up to Ray Easson and he is going to take some time and measure everything up again and check compression, squish, bore, clearance etc.. I showed him the curves i had.. and he was interested. I will give him more info from PVL as i get it.
I would like to check the values from the PVL ignition and see what curve i have been running. I am betting up around 10,000 rpm i am way advanced. I think most 125's should be around 13*, but the curve i have is showing about 16* and it may be more if i factor in the stator, as i believe the pvl curve that i have been posting up is for the 5000 windings stator.
Anyway, when it is all said and done, i am pretty much over it all and just want a reliable bike. So, the option is to put my Yamaha standard ignition on to start back at first base.

I think its parked up over Christmas... so this project wont be going very far until the new year...


Honda / Re: New XR75 K1 1974 Project
« on: November 24, 2017, 02:03:31 PM »
So... been battling the mighty XR again.  Had a few wins and a few losses.

New spokes with correct bend are apparently coming next month.

The motor is at Pipe Kings (Richards) place.  He is rebuilding a peg mount, building up the threads on all 4 peg mounts, making a template to align the holes and retapping them all. Should be a proper repair and strong when he is done with it.

I applied the vinyl decals to the side covers... and the 2k clear ate into the graphics and created wrinkles... as well as i didn't apply them correctly and i got heaps of air bubbles in there.. tried pulling the graphics off, ruined the decals and paint..... then i decided to read the instructions... do not apply for 1 week after painting.... apply wet using squeegee...

Back to square 1.  I ordered 2 more sets of side cover decals.  I repainted the side cover.  I re-read the instructions and now i will wait a few weeks to do the tank the sidecovers.  I did however sand back the front and rear guards, and apply a metal decal to the rear guard, then shoot 2k clear over the lot.  Came out really well.

I also cleaned, primed, painted and clear coated a whole heap of doo dads including swingarm, airfilter cover, brackets etc.  I now have everything painted either by powder coating or by 2k system. All in gloss black.  I did the swingarm myself as i didnt want to remove the rubber bushings which can be an expensive and hard exercise. 

First pick below of the parts now painted.  The rear guard is the only panel which is not original. It is from Re-Mx.  The tyre pressure decal is in the correct location on the back of the rear guard.  Lot of folk get this wrong and put it on the chain guard. This was true for later models, but for 74 it was on the rear guard.

Next pic is of the seat and frame.  The seat base is steel and was pretty corroded.  I got that blasted and powder coated.  It has a new seat foam and cover period correct. The frame was powder coated and the metal decals re-applied.  You can still buy genuine frame decals from Honda.

The last pic here is of the frame steering stem. The powder coaters did a top notch job.  The XR was basically on the border of being a basket case with its snapped peg mounts and just beaten up appearance.  The frame however was in surprisingly good condition.  They blasted, zinc primed and gloss black powder coated the frame, airbox (not airbox cover), pegs, peg mounts, bash plate, seat base and some other brackets.  The decal is genuine Honda for this model.

I pick up the engine on Tuesday.. but start work again on Wednesday.  Looks like i will be slowly assembling the entire bike over the Christmas break.  Most of the hard work is done, and soon it will be time to just clean, check, grease and assemble components.


Yamaha / Re: YZ125K Rebuild
« on: November 22, 2017, 09:52:41 PM »
I got an email back from pvl saying my stator is a 3000 winches one. He reckons my cdi was designed and tested for a 5000 winches stator and he can't provide a curve. Does this make sense?

Yamaha / Re: YZ125K Rebuild
« on: November 22, 2017, 12:14:34 AM »
Hey Loz, bike isnt running yet.. needs a lot of work to get it all up and running.  Engine is going up town to be checked over.  Just wanted to see if timing was still set at 1.2mm btdc and nothing drastic had changed. Tried to do it tonight and digital dial gauge had flat batteries.. its still going up in the morning..
I have emailed PVL in the US with my details, but whats the deal with having that timing curve in a digital cdi that is sold for 125's. I have printed out the curves, and will give to Ray Easson to look at.


Honda / Re: New XR75 K1 1974 Project
« on: November 22, 2017, 12:06:51 AM »
Hey Scotty, this isnt the serious rebuild.. this is just the tidy up for him to go out riding. It is coming up nice though, but there are a lot of aftermarket parts mixed with a ton of OEM goodies.
Let him ride it for a few years, then i will strip it down again for a full original build.  I am keeping the original rims to be rechromed one day and all the little mistakes now will be fixed for the garage queen build.  Can't wait to get it going and get the boy ringing its neck with the power pipe singing......

Yamaha / Re: YZ125K Rebuild
« on: November 21, 2017, 06:57:54 PM »
I stripped the bike down today and took pics of the PVL. I do have the digital cdi 537202.

So, perhaps my ignition is advancing too much. I will have to re-read the last few pages of this thread to get my head all around it again, but it looks like at 4000rpm i am running 38* advance compared to the Yamaha 26*.
I also have the engine on the bench and am ready to assemble it with a lightly honed cylinder, new gaskets and new piston and ring.
I also have the plugs and gauges ready to do a leak down test and compression test.  I will also check my ignition advance settings using my dial gauge, as the motor is on the bench.

It will be going up to Ray Easson in the morning for further evaluation. I will be taking the other cylinder, a few more heads and the old piston.

I got my genuine Mikuni 34mm carb in the mail from oemcycles and will be fitting the jets that the YZ125K came with as standard. 6f21 needle etc..


Honda / Re: New XR75 K1 1974 Project
« on: November 21, 2017, 06:34:25 PM »
The Paint Place mixed a test pot of Kia Sage Green again and it was way to dark.  Not sure whats going on there.. but anyway, i had taken in my old rear mudguard which still had a really good spot on it to run under their spectro thingy...
Came back as Mazda S6 Advan Silver Metallic. It was a great match for my OEM rear guard. They just added a touch more green and i was good to go.
Put down the base coat, and then a few layers of 2k clear over.  When its hardened up, i will apply the decals and then i will be ready to put some more clear over the tank and number plates..


Pages: [1] 2 3 ... 41