'80 GS1100E rebuild

[cavehamster]

If you are going to use it more for the strip, I would lose the airbox & rejet for that. It will gain you a tenth or two in ET reduction & about 3-5 mph in the quarter. Also, is it geared so you are at 9500 in 5th gear at the finish line? This is all assuming you are racing 1/4 instead of 1/8 mile. Ray.

Thanks for the suggestion. The plan is that now that the engine is proven to be working well and the broke in, I will be moving towards putting fuel injection on it via MegaSquirt, so the airbox and etc will be gone pretty soon.

Current gearing has me cross the 1/4 at 9500 at the top of 4th, 16T front sprocket and I seem to have forgotten the rear. What do you think, what should I be aiming to cross the line at?

[rapidray]

15/46 will get you close to being at 9500 in 5th gear at the finish line. Even 10,000 at the stripe will be ok as long as the jetting is RIGHT! Ray.

[cavehamster]

15/46 will get you close to being at 9500 in 5th gear at the finish line. Even 10,000 at the stripe will be ok as long as the jetting is RIGHT! Ray.

OK, I'll give that a shot. I was headed more in the direction of aiming for less shifts, but it would make sense that you would have a better hole shot and stay in the power band better by getting through all the gears.

[cavehamster]

Busy last week and didn't do anything to get ready for racing Sunday, but I went anyway.

Good news is that it felt like it was running strong. Bad news is that I ended up with issues, hah. Turns out I put the wrong oil in, and now I have a slipping clutch, but that can be resolved. The other issue is that the bolt on the end of the crank on the rotor side came undone, the rotor and starter clutch slid off a bit, and ground against the side cover. I found out when the bike wouldn't start. I don't really see any real damage, maybe some pitting on the taper shaft and the mating surface, but nothing that should prevent it from being OK when it goes back together.

Yeah, I overlooked the torque on that nut, grrr.

Anyway.. still lots to do, hope I can find some time between now and weekend after next to have a little done, hah.

[rapidray]

Hey Cave, give me a call at 714-356-7845 when you get a chance. Thanks, Ray.

[davel]

It was a good day at the strip today. Got the bike tuned up and gently broke in the rings over about a half dozen runs before really getting on it. Best time for me was 11.60

Nice bike and very respectable 1/4 mile time! What was your 60' time and trap speed?

[cavehamster]

Nice bike and very respectable 1/4 mile time! What was your 60' time and trap speed?

Wish I knew. The track that I have been going to does not announce the 60 foot time, and my speedo is broken I'm waiting for the local track to open so I can get some actual slips for a change, plus put some new clocks on the bike here soon.

[cavehamster]

Work has had me way too busy lately. But last night I stayed late and machined up the shock mount tabs for the bandit swingarm:



I made a bushing out of stainless steel (actually invar, as we had some pieces laying around in the scrap bucket, haha). I turned the bushing down on the lathe and pressed it into the aluminum, and then machined it off to give me the right stickout for the shock bolt, with a 10mm hole for the bolt.

Now, I just need to mock up the swingarm one more time and mark up where I want them welded. I don't have a TIG big enough to weld this heavy of aluminum, but I found a local machine shop that will do it.

Next up I just need to resolve the sprocket offset issue and I have everything else to mount up a 170 or 180 on the back of the bike, hurray!

[cavehamster]

Wow, dropped the swingarm off to the welding shop this morning and they already have it done, for $20. I'll post pictures tonight.

Dug up a new front tire for it too. It might actually look like a decent bike by the end of the day at this rate!

[cavehamster]

Turned out pretty good I think. We'll see how it fits tonight.

[Turtleface]

Turned out pretty good I think. We'll see how it fits tonight.

That's pretty! I love the look of a nice weld, it's got such a nice industrial feel to it. Any plans to polish, or possibly powdercoat?

[cavehamster]

That's pretty! I love the look of a nice weld, it's got such a nice industrial feel to it. Any plans to polish, or possibly powdercoat?

I'm debating what I want to do with this. The frame is black, the engine is now black, and I am debating going black with the swing arm. I like the look of the mechanical part of the bike being somewhat muted, allowing the body color to pop a bit, with some colored wheels of some sort. But... I gotta think about it a bit.

For now, I plan on bolting it on and riding it for a while

[cavehamster]

Been busy again. I put the swingarm back on to mock it up:



I have one side's spacer machined, still need to do the other side tomorrow and a few other spacers, and this wheel will be on.

Started looking at the front end today a bit. I think the USD forks I got will work, but obviously I still need brakes and a tire/wheel to even start to mock that up. I may need to make a custom top triple clamp to make everything happy, so we'll see.

In the meantime, i got a new front tire for it, but not a tube, since I didn't realize the original front rim was not tubeless. With luck, it will be back on the road this weekend, so maybe with new rubber I can manage to get it registered so I can ride it around town and not just on the 1/4 mile

[cavehamster]

All spacers are machined up, and I have the whole rear end on. Despite having hell bleeding the brake (I haven't managed it yet, grrr), and the chain still needing an offset on the counter sprocket, it rolls well, and felt really good going around the block on. The handling so far feels just right.

Here's some crappy photos of the spacers (grrr need more light on my desk):



That's the right and left spacers, along with the chain tensioners. I thought I didn't get the tensioners with the swing arm, but after I machined them it turns out I have a set. Ah well, I did put a logo on these, so I'll probably keep them.



I milled off the flat edges of the stock axle to fit.

The fitment on the bike looks really good, but I have not had time to give it a laser/string method double check. With a 170 tire on it now, the chain just barely clears the tire with a mm or two to spare without an offset counter sprocket, so that will be needed for sure.

Getting closer!

[cavehamster]

Oh, I forgot I made this into a jpg, here's the solid model for the chain tensioner.

If anyone is interested in anything I have machined to date, I have the models in Solidworks format. I'll probably upload them to a project website someday