Author Topic: 78 750F Chopper/Digger (Read 77799 times)

lucky · « **Reply #100 on:** January 30, 2012, 11:22:09 AM »

Those 4 into 2 into 1 Cycle Exchange headers still do not give you the ground clearance you need unfortunately.

Cycle exchange is making sidewinder exhausts to address that problem.
I would trade those exhausts for the ones that will work. You will probably have to pay a restocking charge but it would be worth it in the long run.
Talk to Ken. That frame of yours is similar to the Cycle Exchange design as far as the ground clearance.

SOHC Digger · « **Reply #101 on:** January 30, 2012, 02:03:58 PM »

I know that the ground clearance will not be the best, but as long as I can get out of my driveway and into the gas station, I will park on the street for all others. I love the way it looks and sounds. The 4 into 1 that they just got done making supposedly has their best ground clearance overall, but at $800, it's not something I'm willing to shell out the cash for.

KB02: that's exactly the look I was going for! Photoshop skills are better than mine! Thanks!

SOHC Digger · « **Reply #102 on:** February 06, 2012, 02:19:59 PM »

Here's some pics of the new style points cover from F-man!

SOHC Digger · « **Reply #103 on:** February 06, 2012, 02:27:21 PM »

A bit of #$%*ty news. My engine locked up yesterday. I had assumed that it was the #1 piston since the paint had started to discolor on the head at #1. Tore the valve cover off and found the camshaft had locked up from lack of oil to 1 and 2 cylinder cam holder. Did further disassembly and found that the source of the problem was a clogged oriface for the 1-2 holder.

In any event, I have a '75 parts engine that I will use the valve train off of and I picked up a 77F cam off ebay this morning. So, hopefully we will be back in business soon. I am glad this was the problem. Much cheaper than a seized cylinder, which would have lead my to go the 836 route.

Nick_701 · « **Reply #104 on:** February 08, 2012, 05:55:16 AM »

I think the motor turned out great, bike looks good.

O dam i just read motor went toast, well at least it looks good, good luck building it again

SOHC Digger · « **Reply #105 on:** February 08, 2012, 06:58:00 AM »

Eh, I'm not too heartbroken. Now I know that I have enough clearance in the frame to remove the valve cover, head, and I'm thinking cylinders too if I needed too.

lucky · « **Reply #106 on:** February 08, 2012, 08:03:49 AM »

Sorry to hear about the oiling problem.
Like you say, at least you can work on the engine without taking it out of the frame.
I am just wondering how that oil hole got plugged up?

I wanted to mention that,that breather hose with that filter thing is going to be trouble.
Oily fumes are coming out of that hose. I would have just put on a longer hose that goes down to the ground down behind the engine. That is the way it used to be done.
Otherwise that filter thing is going to get oily fumes all over your leg and clothing,and bike. It does not have much coming out of it anyway, just the air pressure that gets trapped under the pistons when they are on the down stroke.

SOHC Digger · « **Reply #107 on:** February 08, 2012, 10:11:13 AM »

Lucky, thanks for the advice on the breather. I'll probably have to move it and the regulator/rectifier once I get Tintop's filter kit. So, I will take your 2 cents and move it down and away.

As far as the oriface getting plugged, I think it was residue left over from bead blasting. I scrubbed and soaked the cases and blew them out with air, but apparently something remained. Hopefully this is the last ordeal. An oil and filter change is definitely in order before running again.

SOHC Digger · « **Reply #108 on:** February 10, 2012, 04:51:12 PM »

Engine is back together. I had cam towers and rockers from a K5 parts engine I have laying around. They cleaned up nicely and are in good shape. I picked up a cam off ebay, but ZZPete came through with an even nicer one. Last night I reassembled everything, set my valves, and then rolled the engine over several times to verify oil flow this time. Looks good!

I have to pick up oil and an filter and then I will fire it back up. Knock on wood, this was not a serious and costly as it could have been.

SOHC Digger · « **Reply #109 on:** February 11, 2012, 02:47:07 PM »

I have a confession to make. I'm an ebay addict. I just bought this 4 into 2 exhaust.

"I thought you didn't like 4 into 2, Digger?"

Quote from: SOHC Digger on September 30, 2011, 07:25:40 AM

Quote from: lucky on September 29, 2011, 08:35:01 PM
Looks like you need the 2 into one times two solution. two pipes on each side or one big pipe on each side. Perfect.

Thanks for the advice, but I am not a big fan of 2 into 1's on inline fours because they don't join companion cylinders. In order to really reap the benefits of combining exhausts, you would need to combine 1&4 and 2&3.

The companion cylinders come together on this one!

I'm not ditching the CycleX exhaust; it's just going on a shelf for now. Hopefully these pipes will give me the ground clearance needed.

hapakev · « **Reply #110 on:** February 11, 2012, 10:59:55 PM »

How are you going to mount that, are you putting spigots on the head?

SOHC Digger · « **Reply #111 on:** February 12, 2012, 06:11:16 AM »

Quote from: hapakev on February 11, 2012, 10:59:55 PM

How are you going to mount that, are you putting spigots on the head?

Yeah, putting spigots in the head.

Vbled1 · « **Reply #112 on:** February 12, 2012, 12:13:47 PM »

Love the paint combo on the engine, and the points cover. Nice work all around.

SOHC Digger · « **Reply #113 on:** February 12, 2012, 12:49:25 PM »

Thanks! And for those of you who somehow have missed FrankenFrankenStuff's points covers, here's the link:

http://forums.sohc4.net/index.php?topic=66791.0

Go buy one!!!

zzpete · « **Reply #114 on:** February 12, 2012, 04:15:47 PM »

Quote from: SOHC Digger on February 12, 2012, 06:11:16 AM

Quote from: hapakev on February 11, 2012, 10:59:55 PM
How are you going to mount that, are you putting spigots on the head?

Yeah, putting spigots in the head.

Dude, I have your spigots..... RIGHT HERE! Found you some screws too!!!!

SOHC Digger · « **Reply #115 on:** February 12, 2012, 04:31:24 PM »

Quote from: zzpete on February 12, 2012, 04:15:47 PM

Quote from: SOHC Digger on February 12, 2012, 06:11:16 AM
Quote from: hapakev on February 11, 2012, 10:59:55 PM
How are you going to mount that, are you putting spigots on the head?

Yeah, putting spigots in the head.

Dude, I have your spigots..... RIGHT HERE! Found you some screws too!!!!

Pete, You are the man!

SOHC Digger · « **Reply #116 on:** February 17, 2012, 04:00:23 PM »

Still waiting to put the exhaust on until I swing by Pete's this week to pick up the spigots.

Tintop says I should have my filter set-up this week.

And I finally got my oil and filter changed, started the bike up, and went around the neighborhood a little. Seems happy now!

I also picked up a new choke cable (the friction adjust on mine was broken) and the push throttle cable (just cause I don't want to run single cable.)

Stay tuned! This week should have some good updates!

SOHC Digger · « **Reply #117 on:** February 20, 2012, 09:15:54 AM »

Picked up the spigots and removed the straight pipes I was running temporarily. Proceeded to remove the exhaust studs to make way for the spigot screws. They all came out pretty easily except for the two very outer ones (one at #4 and #1) which pulled the threads right out of the head. Well #$%*. Picked up a 8mm heli-coil set from Napa and we'll fix those up.

I was able to put the inside pipe for cylinders 2&3 and see how it lays. Perfect. Clears the pegs and brake pedal and still gives me plenty of ground clearance. I held the other pipe up for an idea and I will clear the peg and shifter, but I will have to move my kickstand back a few inches. I contacted the good people at chassis design company and they are setting me up with a new weld-on mount since I don't want to have to reuse the other one after I remove it.

YoungRider71 · « **Reply #118 on:** February 20, 2012, 02:51:01 PM »

I just finished reading your entire build and it looks amazing. Great job. I am no expert but have seen lots of warning on the forum about blasting frames and the media can clog the oil tubes. I don't know if you plan on using the other motor for anything. Just a thought. keep up the good work!!!

cheapride · « **Reply #119 on:** February 20, 2012, 04:53:12 PM »

bummer on the oil problem. Glad you didn't have to pull the engine.

SOHC Digger · « **Reply #120 on:** February 22, 2012, 07:08:08 AM »

I heli-coiled the head with no problem. Had to cut the kickstand bracket off to mount the pipes. So, I fired the bike up while it's sitting on a block of wood. The sound is great! It's quiet enough to keep the cops off your back, but loud enough to get you noticed. I will post pics and a video when I get a chance so you can see what they look and sound like.

zzpete · « **Reply #121 on:** February 22, 2012, 01:19:02 PM »

I'm diggin the Digger Project!!!!

SOHC Digger · « **Reply #122 on:** February 29, 2012, 02:14:35 PM »

Finally some pics of the new pipes on the bike. Kickstand got moved to the rear, pipes mounted. Nice.

FrankenFrankenstuff · « **Reply #123 on:** February 29, 2012, 05:22:53 PM »

I dig.

cheapride · « **Reply #124 on:** February 29, 2012, 06:00:48 PM »

Love the pipes.

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Author Topic: 78 750F Chopper/Digger (Read 77799 times)