Friday, April 24, 2015

John bought a Rokon!!!


Reinforcing the Chianti Box for the Last Time

This box has been on the back of my bike for 3 years, taken a fair share of abuse, and held up for the most part. I'm finally getting around to making an aluminum insert so the wood is not structural. I love the functionality of the box and for some reason I like the way it looks.

The aluminum interior is 1/8 5052, hastily mig welded together. I colored some stainless blocks using a hotplate and will use them to clamp the wood to the interior box. Eventually I may add a lid and some small tie downs, but fr now I want to see if I can get by without adding any clutter.

The bike tins are out getting a fresh coat of paint so it's now just sitting naked and cold with time to tie up loose ends.

Monday, June 16, 2014

New Daily Driver, needs love and lift

This was my friends jeep and when my sweet volvo gave up the ghost, I couldn't pass it up. Every mechanical system needed work, but its getting there. Here s a before and after of the suspension work.

Monday, January 20, 2014

Winter work

I finally got the courage to start the mods on Rock Flute I want to complete before the 2014 Whcm. Part of which is eliminating the off idle stumble while cruising. I hope that after having to bash a groove back into a mutilated air jet that increasing them to 1.1 from 0.9 will lean out the emulsion. Ohh how I miss riding this bike.

Next bike build on the list is the W650 digger, the attic cycle.

Friday, August 16, 2013

Carb Support for VM29 Smoothbores on a CB750

I made this support using some 3/8 aluminum round and a few screws. Its held in position by one of the top case screws. Well see if it works for the long haul.

The reason I need this support is because the aftermarket boots to asapt vm29s to a CB750 kind of suck. They are quite soft out of the package and get even softer as they go through a few heat cycles. They also have a tendency to leak, which is a potential cause of my continually shrinking main jet size. I've been chasing a rich conditio all the way down to 110s and on pulse type carbs, a leak at the intake boot will cause the engine to run rich. This counters the more common thought that a leak here woyld cause a lean condition. Something good to keep in mind.

Ill be doing a little leak checking in a bit.

Wednesday, June 26, 2013

Acid Sunrise - a 70's CB chop

Finished up the new chopper just in time for the World Honda Chopper Meet this year.  Tore the bike down in March, replaced just about everything, and ended up with just what I wanted.  Sorry there weren't any in-progress shots, I got busy and didn't take many pictures.  Bike rides great, time for the next project.  A big thanks to TurboGrimace for the wiring, motivation, and general assistance in getting this bike together so fast.

Monday, June 10, 2013

Rock Flute: Tuning Session 2, in the rain.

I spent some time going over a few things on the bike prior to continuing with the carb tune. Tune the drive, tune the clutch etc. etc.  Tunessss mannn.  All positive waves.
I installed a 17 tooth front sprocket and a longer chain. Originally 15/48 3.2:1 final drive, now 17/48 2.82:1 final drive. 3.2 is loads of fun but not realistic for anything other than stupid fast bar hopping and light racing. 2.82 is within the range of stock but still toward the upper range to take advantage of the engine mods. The cam kicks hard at 5000 rpm and above. With the new final drive, a shift to 4th at 65 mph puts the bike right under this 5000 rpm threshold and a shift to 3rd ignites the rockets.

I also adjusted the clutch and put on a new cable. John "jleather" spun up a cute brass barrel adapter to replace the one I lost when my cable broke. Unfortunately after a lot of adjusting, I have to settle with a neutral that is very hard to capture. The clutch lever does not have enough throw to allow a clean shift to neutral and full compression of the clutch plates. Ohh well. Later I will find another clutch lever with a longer throw.

So finally to the CARB tuning. Like I said before, I'd resume with the 115 mains, 15 pilots, air screws at 1.5 turns, and the needles now all the way down. Well... its darn near perfect. There's an occasional tiny stumble with a slight rotation of the throttle off of idle. Its right at the bottom of the throttle cruising range for low speeds. The plugs are gorgeous but I can still feel the hesitation. The rest of the throttle range feels spot on and provides a slightly rich color to the plug base ring. Below is a picture of the plug chop cruising just above the stumble. The remainder of the chops at varying throttle all look similar this. Always work from the bottom up. Otherwise your lower throttle ranges can screw up your readings.

I'm going to try and tweak the stumble out with the air screws, but it's certainly something I can live with for now.  The strap looks a tiny bit hot so I may benefit from a spark plug with more heat capacity.  I'm running a .026" gap and might close it up a bit to see if I can get a more complete burn.  The balance between the increased compression and the higher spark voltage should balance out a bit to where a .026" gap is nearly ideal.... Maybe?  

The final steps are to replace the rocker shafts and run a tool over every nut and bolt. HOME STRETCH!!!