Author Topic: 1974 cb750 fun "Spruce Goose" (STEP 2: frame/suspension) (Read 28793 times)

SOHC4 Cafe Racer Fan · « **Reply #125 on:** February 09, 2016, 08:08:39 PM »

It came out nice. I've done the hot soak with Simple Green but it still required lots of wire brush work.

mashfu · « **Reply #126 on:** February 09, 2016, 08:48:51 PM »

Thank you, ya the caked on gunk just melts away with the wire sooooo satisfying!

mashfu · « **Reply #127 on:** February 10, 2016, 12:30:10 AM »

Couldn't stand it any longer had to see what im getting myself into. Haven't gotten the stem conversion just yet but can still do a quick mock up!

mashfu · « **Reply #128 on:** February 10, 2016, 11:17:33 PM »

Was having the hardest time removing a few tappet covers so did some searching and ended up trying two suggestions first filing the sides of the hex down to a smaller size (no success) next was chisel. They came off like butter after a few whacks! One more to go, think ill save it for when people aren't sleeping

mashfu · « **Reply #129 on:** February 12, 2016, 06:43:29 PM »

Lapped the valves today, really glad i got hondaman's book! Used the k valves to test and got the seal area to be about 1mm-1.5mm on all of them. Only thing that i could see that might cause some concern is the margin. Will probably compare these valves to the f valves and see which ones have been worn down less. After that is done i will be doing a leak test to make sure everything is nice and tight. Also began a test on the spare jugs that i have to see how they might look with black wrinkle, will have some pictures up later tonight

redwillis1978 · « **Reply #130 on:** February 12, 2016, 06:51:44 PM »

Quote from: mashfu on February 10, 2016, 12:30:10 AM

Couldn't stand it any longer had to see what im getting myself into. Haven't gotten the stem conversion just yet but can still do a quick mock up!

You will want to mock up your tank choice ASAP and see how much modification it is going to take at the front.

mashfu · « **Reply #131 on:** February 12, 2016, 09:47:58 PM »

Not sure if this is up to standard but i got the pitch to change when the valve hits the seat, after lapping for a few minutes. Definitely needs some touch up to the chambers themselves think i will do a lighter touch up than i did to the f head to get the carbon off.
Comparison of k and f respectively.

mashfu · « **Reply #132 on:** February 12, 2016, 11:47:26 PM »

Quote from: redwillis1978 on February 12, 2016, 06:51:44 PM

Quote from: mashfu on February 10, 2016, 12:30:10 AM
Couldn't stand it any longer had to see what im getting myself into. Haven't gotten the stem conversion just yet but can still do a quick mock up!
You will want to mock up your tank choice ASAP and see how much modification it is going to take at the front.

That completely skipped my mind, I'll put them all on again soon to see if there is anything interfering

mashfu · « **Reply #133 on:** February 13, 2016, 01:24:14 PM »

Doing it right this time! Taped up, protected and finer grit

mashfu · « **Reply #134 on:** February 15, 2016, 10:31:15 PM »

A few more passes with acetone and i can start painting, painted the other jugs i have without any prep just to test the waters. Came out horrible but i expected worse hahaha! Dirt, oil and other particles give it character~

mashfu · « **Reply #135 on:** February 16, 2016, 07:01:40 AM »

Bottom side first, gonna let it sit for a bit then get the top

mashfu · « **Reply #136 on:** February 16, 2016, 03:59:48 PM »

Sat in the sun for a few hours... California weather

there are a few flat spots on the top fin but since the head will be blocking it, i can't complain! This will be the only piece to get some paint everything else is just going to get some extra love from the scotchbrite!

mashfu · « **Reply #137 on:** February 20, 2016, 06:59:47 PM »

Finally have a day off! Cut some pvc and started to insert pistons 2&3. Put some marvel oil on the rings and coated the jugs with oil aswell. 2 more shims for 1&4 and that should do it!

mashfu · « **Reply #138 on:** February 20, 2016, 07:51:55 PM »

Success! And then the power went out its a sign! Too much awesomeness

edwardmorris · « **Reply #139 on:** February 20, 2016, 08:21:57 PM »

Can't tell from the pix but I really hope there were two o-rings of proper thickness on the rear central two studs. Good progress!

mashfu · « **Reply #140 on:** February 20, 2016, 08:40:03 PM »

Quadruple checked!

mashfu · « **Reply #141 on:** February 21, 2016, 05:04:53 PM »

Felt alittle unsure about my first attempt at lapping, so i did number 1 over again and did a leak test... Looks to be holding!

mashfu · « **Reply #142 on:** February 29, 2016, 10:41:25 PM »

Loaned a spring compressor from the auto store to find that what i believed would work to compress the valve springs actually did not work at all... Ended up using some pliers to compress the springs and very angrily positioned the retainers. Cant really feel my hands

mashfu · « **Reply #143 on:** March 01, 2016, 12:57:58 PM »

Slowly but surely

mashfu · « **Reply #144 on:** March 02, 2016, 01:10:20 PM »

Put the cam in today, but i have a few questions about timing. Is it better to time everything once i put the engine back into the frame or is it easier to time with the engine out? Definitely do not have time this week to start, but once i do have time i plan to knock it out

edwardmorris · « **Reply #145 on:** March 02, 2016, 02:38:19 PM »

Easier on the bench, especially stock cam...

mashfu · « **Reply #146 on:** March 02, 2016, 03:19:58 PM »

Excellent, haha then i can lag the front end even more!

mashfu · « **Reply #147 on:** March 04, 2016, 10:09:30 PM »

Got the rocker arms on and cam/timing mark aligned

mashfu · « **Reply #148 on:** March 05, 2016, 04:46:41 PM »

Ordered a damaged top triple for a few bucks and pleased with the alteration done to the badge cut out. Will file the broken ignition mount and will most likely cut away the towers on the bottom which i assume are also for the ignition. Load wise i do not think the triple has been compromised it is also straight, just needs a little love from a grinder!

mashfu · « **Reply #149 on:** March 21, 2016, 12:37:44 PM »

Had some time to take apart the front wheel, believe i will go with the cognito front hub with the stock rim but i am hesitant about the rim... There is some rust on it and as i move the rim around i can hear debris inside of the rim. Not sure if pitting has allowed material to get inside and if that is the case should i even be using it? What is the consensus on how many licks(holes) it takes to get to the center of a tootsiepop(stock rim) and not use it? It seems sturdy but thats relative...

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Author Topic: 1974 cb750 fun "Spruce Goose" (STEP 2: frame/suspension) (Read 28793 times)