Author Topic: CB750 Wet Sump Conversion - Sumpthing (Read 81174 times)

scunny · « **Reply #225 on:** April 07, 2018, 03:40:28 PM »

Hey Rob, good to see you are still tinkering. Whats the story with the battery location up front ?

voxonda · « **Reply #226 on:** April 08, 2018, 01:01:45 AM »

Quote from: scunny on April 07, 2018, 03:40:28 PM

Hey Rob, good to see you are still tinkering. Whats the story with the battery location up front ?

Hey Scunny, due to loosing the oiltank which doubled as a battery holder, and the fact I changed the fairing mounted oilcooler, I chose to put the battery there.

voxonda · « **Reply #227 on:** April 08, 2018, 03:06:04 PM »

Today working in the sunshine replacing the primary and camchains with Bryan. Nice to see everything still looks very good inside the engine after all the hard work she went through.
6 seasons of 3 hours races and demo's.

NickO · « **Reply #228 on:** April 12, 2018, 07:10:51 AM »

Hey Rob, that middle picture above really threw me for a few seconds. I thought it was some crazy super-short stroke water-cooled two stroke motor, but with no exhaust ports!!!

voxonda · « **Reply #229 on:** April 16, 2018, 03:08:19 PM »

Only flaw in engine, a slightly worn topshell on #3 main, due to pulling of the camchain. Although usable a new one will be fitted, rest looks as if new.
Good to frequently change oil and filter.
Already mounted a new primary tensioners to work with the HD chains. Not bad for a engine last opened a decade ago, and since than trashed around every single season.

voxonda · « **Reply #230 on:** April 24, 2018, 01:45:16 PM »

Dissambled the head and #2 and #3 inlet valves need to be replaced.

voxonda · « **Reply #231 on:** April 24, 2018, 01:49:20 PM »

Waiting for a new set of (4) inlet valves. Have to recut the seats of 2 and 3.

voxonda · « **Reply #232 on:** April 25, 2018, 01:11:26 PM »

Bottom end closed, next task is the head.....

gschuld · « **Reply #233 on:** April 25, 2018, 03:10:55 PM »

Nice Rob.👍

While you are waited by for new valves, could you share the specs on this engine for those curious?

George

voxonda · « **Reply #234 on:** April 25, 2018, 11:52:28 PM »

Nothing fancy, George. The tracks we use it on , do not reguire hp engines how strangly that may sound. We enter in the 750 (demo-)class, so big bore is out. I rebuild this engine almost 10 years ago and just made sure it all suits, cant call it real blue printing , but close. Slightly cleaned up the ports, no real porting though, Mike lives to far a way.......My pride and joy, Accent electronic ignition, a set of CR31's and a home build yoshi like pipe gives a healthy 72 rwhp. Did use a 63 b cam, but did not suit the tight tracks. So use oem one. Still have a new yoshi 823 kit, but will not use that for now. Use the bike, of course to test run the Wet sump.
I also run a AMA-like VFR to run with the fastest competition like FZR, GSX-R, Kawi and Suzi 1000's.

Rob

voxonda · « **Reply #235 on:** May 02, 2018, 02:54:52 PM »

Engine closed up again.
Building engine complete on stand to check if oil delivery is ok.

Bert Jan · « **Reply #236 on:** May 08, 2018, 01:32:05 AM »

Great to see she's back together! Now start it haha!

wannabridin · « **Reply #237 on:** May 11, 2018, 02:16:15 PM »

Hey rob, where's that dry clutch of mine?

voxonda · « **Reply #238 on:** May 11, 2018, 02:38:23 PM »

Quote from: wannabridin on May 11, 2018, 02:16:15 PM

Hey rob, where's that dry clutch of mine?

Sorry Bud, no can do.................things (sh..t) happens in life. Am reconsidering my options in making a new version.

voxonda · « **Reply #239 on:** May 11, 2018, 02:44:58 PM »

Well at least she looks like a bike again......

gschuld · « **Reply #240 on:** May 11, 2018, 03:27:28 PM »

Nice....

Getting close to firing her up?

George

slikwilli420 · « **Reply #241 on:** May 11, 2018, 04:14:35 PM »

Looking good. What seat is that been thinking about something bigger than my current one.

voxonda · « **Reply #242 on:** May 11, 2018, 10:34:22 PM »

Yes, getting close to firing her up, George. Seat is a Honda RCB endurance. Think Airtech does them now too.

voxonda · « **Reply #243 on:** May 12, 2018, 01:24:34 AM »

Quote from: slikwilli420 on May 11, 2018, 04:14:35 PM

Looking good. What seat is that been thinking about something bigger than my current one.

This one....

voxonda · « **Reply #244 on:** May 13, 2018, 02:55:39 PM »

Nearly there.............

BPellerine · « **Reply #245 on:** May 13, 2018, 04:36:19 PM »

is that an alternator being driven off the counter shaft?

voxonda · « **Reply #246 on:** May 13, 2018, 10:35:29 PM »

Yes, it is.

Tintop · « **Reply #247 on:** May 14, 2018, 06:54:15 AM »

I'm sure you have a reason Rob, but just wondering why you didn't re-locate the battery to the old oil tank position. Would lower CG, and remove weight from the steering head.

voxonda · « **Reply #248 on:** May 14, 2018, 10:13:16 AM »

Quote from: Tintop on May 14, 2018, 06:54:15 AM

I'm sure you have a reason Rob, but just wondering why you didn't re-locate the battery to the old oil tank position. Would lower CG, and remove weight from the steering head.

it is a try-out to get more weight on the front. It sits on a subframe so no direct influence on steering. Easy to change position.

gschuld · « **Reply #249 on:** May 15, 2018, 09:58:26 AM »

Rob,

Off subject(sorry), but did you by chance build this swingarm? It’s very well made and about 2” longer than a standard k model arm and 9.5” ID at the rear axle. I recall you favoring and building box section swingarms about 1 1/2” longer than stock(along with 45mm offset trees) on your road racers. No axle adjusters or rear axle came with this arm (no big deal, I’ll custom make new ones)

I’m just curious as I haven’t yet identified who built this one. It was never run, still bare steel.

George

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Author Topic: CB750 Wet Sump Conversion - Sumpthing (Read 81174 times)