85 motor on 87 frame running...

CharlotteSpreeRider · Post by **CharlotteSpreeRider** » Sun May 18, 2008 8:47 pm

I've got the pig running now. It's not running great, and I'm not sure why. The speedo cable is busted (I need to get around to ordering another one), so I don't know how fast it goes, but just based on what it feels like, I'm only getting up to about 15 MPH. It starts just fine from the kick starter, and idles nice. The motor seems MUCH louder than my 85, and I'm not talking about the exhaust, the exhaust is much quieter. I'm not sure what kind of muffler this is, but the lady said she got it from Greg (uspmale), and it's one of the rectangular ones as opposed to the round ones. It seems quite a bit heavier than my round one. It fits on just fine. The engine revs nicely and the carb is clean. I dipped 3 disassembled carbs this weekend, then took the best looking parts between those 3 and put them together, then cleaned the carb again and put it on. It fired right up with no complaints, from the kick starter. Air cleaner is solid, new filter, no air leak. Plug is coming back black. I think the bystarter might be hosed. When I got it, it was in a plastic bag disassembled and the wires were bare (I had to put on connectors).

Does bystarter not moving causing super rich condition sound like a likely cause to not be able to get over 15MPH? It's not bogging or anything, it just seems to have a total lack of power.

Thanks,

-aseigler

Post by **noiseguy** » Tue May 20, 2008 9:39 am

Sounds like it's running lean. It will just bog out at higher speed.

If it's too rich the engine will 4-stroke (fire every other stroke rather than every stroke) that's typically what it will run like in over rich condition. Mine does this for a few seconds while the bystarter moves up.

CharlotteSpreeRider · Post by **CharlotteSpreeRider** » Tue May 20, 2008 7:34 pm

Plug seems to say rich. Real rich, like wet. Something is amiss. On the stand, running at WOT, it seems like it's only about half throttle. The back wheel is spinning pretty fast, but not anywhere near as fast as my other bike. On my other bike, if I ran it WOT on the stand, the back end would start bouncing so hard I'd be afraid the thing was going to jump off the stand. This one will run at WOT seemingly indefinitely without ever hitting that RPM range where I back it down. It sounds different than my other bike. The exhaust is nowhere near as loud, and the engine is MUCH louder. This weekend I'm going to swap the exhausts and see what that does. The exhaust I got is the rectangular one. It weighs waaaaay more than my other round exhaust.

I'm not really sure what's up. It runs well, takes off like a bat out of *, but when it hits about 15 MPH it's like it's got a governor on it. I don't know.

-aseigler

Kenny_McCormic · Post by **Kenny_McCormic** » Tue May 20, 2008 9:10 pm

Make sure the airbox lid isnt clogged up with a dirt/oil mixture.

CharlotteSpreeRider · Post by **CharlotteSpreeRider** » Tue May 20, 2008 9:15 pm

It's spotless. I wouldn't have put it together dirty.

-aseigler

Post by **noiseguy** » Wed May 21, 2008 12:46 am

More weight is usually an indication of clogging; exhaust should weigh a little over 3 pounds. I'm betting that swapping exhausts fixes it.

Too much back pressure could (I guess) leave too much gas in the combustion chamber and cause the wet plug.

CharlotteSpreeRider · Post by **CharlotteSpreeRider** » Wed May 21, 2008 7:46 am

The thing is, I'm not sure this is a Spree exhaust. It feels like it weighs about 10 pounds or so. It bolts up perfectly to the Spree, but it seems like it's made out of a much heavier and thicker metal than my other exhaust. The lady I got it from said she got it from Greg (uspmale) and he said it would fit, but that's all she knew about it. It's more box-shaped than round, and seems like it's about twice as big around as the "normal" Spree exhaust. I'll swap em this weekend and see if the odd behavior follows the exhaust or something else. It's nice having two of these things, I can swap parts to test rather than just make a bunch of guesses.

-aseigler

CharlotteSpreeRider · Post by **CharlotteSpreeRider** » Wed May 21, 2008 9:22 am

Based on pictures from eBay, I think it's an Aero exhaust. It bolts on ok, it's just bigger and heavier than the Spree exhaust. We'll see what happens when I swap them out.

-aseigler

Post by **noiseguy** » Wed May 21, 2008 3:20 pm

It's not an Aero exhaust; if it was it wouldn't fit.

I have both types of can for Spree sitting in the garage; they weigh about the same amount when clean.

It's heavy because it's clogged. Start up the campfire and start roasting that pig.

CharlotteSpreeRider · Post by **CharlotteSpreeRider** » Sun May 25, 2008 9:31 pm

Swapped exhausts with my running 85. It runs alot faster now. Put the other one onto my 85, and it went from a top speed of about 30 to barely doing 25. Then I ran over a nail in the road which tore a hole in my tube. Pulled the muffler off and sprayed 2 cans of oven cleaner into it, then dealt with the popped tire. Let the oven cleaner sit all afternoon, then I drained and flushed it, and put it on the grill. We'll see how it worked out tomorrow. The exhaust was super plugged. Hopefully it will work alot better once I get it cleaned out.

-aseigler

CharlotteSpreeRider · Post by **CharlotteSpreeRider** » Sat May 31, 2008 6:54 pm

Well, it's running great now. The motor, at least. It revs up sounding like my other bike does at 30, but it's going no more than about 18 I figure just based on the wind (need to get around to ordering a speedo cable). I figure with sufficient RPM, the only thing that could be causing it to go so slow is the belt. It's been running for the past 90 minutes so I'm going going to take it off now (too hot), but later I'll check and see if it is too thin. Any other ideas as to why it would rev high but go slow?

Thanks,

-aseigler

Kenny_McCormic · Post by **Kenny_McCormic** » Sat May 31, 2008 9:55 pm

Worn belt, slipping clutch.

CharlotteSpreeRider · Post by **CharlotteSpreeRider** » Sun Jun 01, 2008 6:49 pm

d*** it all, d*** it all straight to *. It was the belt. Which doesn't sound too bad, right? Wrong. Back up a month to when I had the bottom end torn apart. I ended up not putting back in the same crankshaft that I had pulled out. I had another crankshaft which was in better shape. What was wrong with the crankshaft that I pulled out? The little teeth that hold the front sprocket to the crankshaft were mysteriously worn. I didn't think much of it at the time, just attributed it to some dumb * doing something stupid. So I put a good crankshaft in and it bolted up nicely. Of course, after running the bike around a while with a barely 8mm belt (that LOOKED good, I swear!), when I popped the belt cover off, there was metal dust covering the whole motor. The sprocket was loose on the crankshaft, but the bolt was still VERY tight. The sprocket has chewed off the teeth on the crankshaft, completely and was pretty much spinning freely unless pressed in tightly.

Now I'm going to have to get a new belt (actually, I'm getting 2 and replacing the one on my good, red bike to make sure this doesn't happen to that one), and I'll be doing a second bottom end rebuilt on this black bike, using another spare crankshaft. d*** it all. I did NOT want to take this thing back apart again, but the sprocket will not turn the crankshaft, the teeth are completely gone.

Oh well, lesson learned. Measure your belts, people, every time you have the cover off. If it's anywhere close to 10mm, replace the thing ASAP and spare yourself hours of work that I'm going to have to do now.

On a side note, the spare crankshaft I have left has the bearings stuck on it. Any poor man's way of getting those bearings loose that you guys can think of? I'm staring at the thing, and I'm at a loss.

Thanks,

-aseigler

CharlotteSpreeRider · Post by **CharlotteSpreeRider** » Sun Jun 01, 2008 8:12 pm

I think I'm going to have to find a way to kick my own *. After disassembling the front sprocket/pulley, I noticed that I failed to put in a key washer, the one you but on before the pulley. It's supposed to go washer, pulley, sprocket, washer, nut. I had it pulley, sprocket, washer, nut. This plus the thin belt messed the alignment up enough to screw up everything. I put it back together with the missing washer, and it fits together much better. I don't think I'm going to need to replace the crankshaft right away, but I will need a new belt, for sure (and I'm still getting two to also replace the one on my red bike).

-aseigler

Kenny_McCormic · Post by **Kenny_McCormic** » Sun Jun 01, 2008 9:28 pm

Stuck on bearings? HAHAHA, shop press FTW!!!