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 Manco Streaker Mini Bike

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AllisKidD21
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PostSubject: Re: Manco Streaker Mini Bike   Manco Streaker Mini Bike - Page 2 Icon_minitimeTue Jun 11, 2019 11:54 pm

Well it would appear this turned into more than a new rear tire....

Manco Streaker Mini Bike - Page 2 20190640

Manco Streaker Mini Bike - Page 2 20190641

Haha, yepper! I figured it was time the ol' Teccy got some love, so I yanked it out and tore it down on the bench.

Got the cylinder head off, doesn't look too bad for the age of the engine:

Manco Streaker Mini Bike - Page 2 20190642

Next I pulled the valves, since I figured on lapping them and doing some port work:

Manco Streaker Mini Bike - Page 2 20190643

Then I got myself a mirror and some sandpaper and sanded the head down nice and flat:

Manco Streaker Mini Bike - Page 2 20190644

I know I won't be taking enough off for much of a performance gain, but it'll help a little.

After sanding it 'til the high spots were gone I set it on the block to test the flatness. I found that was able to rock it maybe 0.001" with my finger so then I used the valve grinding compound to sand the head and the block together:

Manco Streaker Mini Bike - Page 2 20190645

Turned out nice! Should be good and flat now.

Next came the port work. The stock ports were actually not too bad, so I just did some minor cleaning and made the inner bend a lot wider and smoother to free up some flow.

Before:

Manco Streaker Mini Bike - Page 2 20190646

After:

Manco Streaker Mini Bike - Page 2 20190647


Manco Streaker Mini Bike - Page 2 20190648

Got the valves lapped and got a nice finish on them and the seats on the block:

Manco Streaker Mini Bike - Page 2 20190649

I also figured on giving the cylinder a good hone, since there was no cross-hatching left and a little bit of scarring.

Before:

Manco Streaker Mini Bike - Page 2 20190650

After:

Manco Streaker Mini Bike - Page 2 20190651

Turned out pretty nice! Still just a hair of scarring left, but it shouldn't hurt anything. It's much better than before.

When I had the piston out I also noticed that the top compression ring was siezed:

Manco Streaker Mini Bike - Page 2 20190652

I'm sure that wasn't helping performance, haha. But I ended up useing some penetrant and a screwdriver to get it freed up and springing nicely again. Then after some cleaning the piston went back in:

Manco Streaker Mini Bike - Page 2 20190653

Didn't really check clearances like I should have, but the bearing surfaces looked onto be in beautiful shape so I didn't worry about it too much. After I torqued the rod bolts I got the block ready to go back together and put the cover back on:

Manco Streaker Mini Bike - Page 2 20190654

Looking pretty freshed up!

Manco Streaker Mini Bike - Page 2 20190655

Put the valves in next. Both springs got shimmed up with some washers:

Manco Streaker Mini Bike - Page 2 20190656

Shouldn't be too much, I checked them at full lift and the springs aren't being compressed past their limit, so I don't think it will hurt anything.

Here's how she sits as of tonight:

Manco Streaker Mini Bike - Page 2 20190657

Pretty happy with how things went! Gonna be cool to get it back on the bike and see how it does, haha. Tomorrow I'll get the head put back on with the new gasket, then I'm gonna try a bit of a timing advance to see if I get get a bit of a top end power boost. I'll most likely port the intake manifold a bit too before I put the carb back on.

Gonna be good I'm thinking! Got a new clutch coming for 'er too so hopefully I can put some power to the ground a bit better, haha. Let me know what ya think!
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MightyRaze
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PostSubject: Re: Manco Streaker Mini Bike   Manco Streaker Mini Bike - Page 2 Icon_minitimeWed Jun 12, 2019 12:05 am

I've seen a lot of things, but I have never seen springs shimmed like that before. Interesting.

Engine looks all cleaned up well. Danceparty

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PostSubject: Re: Manco Streaker Mini Bike   Manco Streaker Mini Bike - Page 2 Icon_minitimeWed Jun 12, 2019 8:21 am

Just wanted to add a little stiffness. I've wanted to try it on an engine for a while, but never did it 'til now, haha.

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Double W Cross Ranch
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PostSubject: Re: Manco Streaker Mini Bike   Manco Streaker Mini Bike - Page 2 Icon_minitimeWed Jun 12, 2019 11:33 am

Nice bit of rebuild there! I've also never seen springs like that before. Any ideas on what kind of tire you're going to get it?
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AllisKidD21
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PostSubject: Re: Manco Streaker Mini Bike   Manco Streaker Mini Bike - Page 2 Icon_minitimeThu Jun 13, 2019 12:46 am

Thanks! As far as finding a new tire for a 5" rim, I had no luck. But I did remember that I have a pair of little utility wheels with tires the same size as I need, so I ended up putting one of those on the front rim and swapping the good original one to the back. Probably gonna check online a bit to see if I can get one with the original tread.

Anyways, more engine work! Here's the finished head after the sanding and lapping. I also bit a small bit of work around the valves and shaved a bit of material to expose the spark a bit more:

Manco Streaker Mini Bike - Page 2 20190658

Manco Streaker Mini Bike - Page 2 20190659

Bought myself a goodie today too, since I wanna speed 'er up some:

Manco Streaker Mini Bike - Page 2 20190660

Yep! Dropping from a 60 tooth sprocket to a 48 tooth on the rear. Should be a nice upgrade, haha.

Then I did some porting work on the little intake manifold, mostly smoothing out the bends and cleaning up the casting on the inside. Also took aways some material to make the engine side opening more round, as it had a funny flatspot in it:

Manco Streaker Mini Bike - Page 2 20190661

Noticed a spot on the exhaust flange where it was blocking off the flow a little bit:

Manco Streaker Mini Bike - Page 2 20190662

So I opened that up a bit as well.

Got the manifold bolted back up:

Manco Streaker Mini Bike - Page 2 20190663

Then I took a shot at the timing advance. I couldn't do my filing trick with the coil because it was so thin on one side, so I actually just ended up removing the key and advancing it on the crank:

Manco Streaker Mini Bike - Page 2 20190664

Not sure exactly how much it moved. Maybe about 0.045" or do, should be good for a couple degrees anyways. Well see how she likes it!

Oh, and here's the tire I'm putting on:

Manco Streaker Mini Bike - Page 2 20190665

Manco Streaker Mini Bike - Page 2 20190666

Not the best tire for this application, but it's much better than no tire at all. Haha. As I said though I'll probably look around online for one, this one will get me by for now.

Lastly I gave the carb a little bit of cleaning, and trimmed the limit tab on the butterfly shaft to get a couple extra RPMs:

Manco Streaker Mini Bike - Page 2 20190667

When I first got it actually bent that tab a bit which freed up a couple RPMs, but if you bend it too far it hits a part of the carb and doesn't go back to idle. So I figured I cut it short and see what happens, haha.

Here she is as of tonight:

Manco Streaker Mini Bike - Page 2 20190668

Going back together nicely!! I'm definitely thinking I'll be able to test fire it tomorrow the way things are going. Also I can do a bit of a break-in being that I honed the cylinder. Hopefully she wants to run good for me, haha.

Let me know what ya think!

_______________________________________________
"This'll either wake you up or put you to sleep forever!"- Red Green         "Just took a center punch *Wham!* Oh that's close enough." - TheBeal
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AllisKidD21
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PostSubject: Re: Manco Streaker Mini Bike   Manco Streaker Mini Bike - Page 2 Icon_minitimeThu Jun 13, 2019 10:08 pm

Alrighty, good progress today!

Got the engine all assembled, and the rear wheel and sprocket reinstalled:

Manco Streaker Mini Bike - Page 2 20190669

Manco Streaker Mini Bike - Page 2 20190670

The engine was being finicky at first, might've been something to do with the timing advance. But either way, I eventually got it figured out and got 'er running good! Then after that I started re-mounting it in the frame, and hooking everthing up.

Test drive went well!!

Manco Streaker Mini Bike - Page 2 20190671

Manco Streaker Mini Bike - Page 2 20190672

Definitely noticed a difference in performance. The revs are nice and snappy, and there is a lot less bogging upon take-off and in rougher terrain than there was before. Real good low-end power it seems. Feels like a nice improvment to me!

I hit 28mph with it now, so I gained 5mph with the new sprocket in the rear. If I do a bit more tweaking to get to 30 it'd be pretty sweet, but I'm still happy with 'er now.

Oh I aso painted my choke mount to make it look less junky, haha.

Manco Streaker Mini Bike - Page 2 20190673

Much better!

So I after I put some hours on the engine I dropped the oil while it was warm:

Manco Streaker Mini Bike - Page 2 20190674

Pretty silver, but I expected that after the fresh hone job. I'll most likely change it again on the weekend.

Also gave the new plug a check while the oil was draining, to get an idea how it's burning:

Manco Streaker Mini Bike - Page 2 20190675

Kinda hard to see the nice tanish colour in that picture, but it looks about perfect! Seems like everything is going well so far, so I'm happy with it. Gonna get a new clutch for it tomorrow to replce this worn out one and see how it acts after that. Should be good!

Let me know what ya think!

_______________________________________________
"This'll either wake you up or put you to sleep forever!"- Red Green         "Just took a center punch *Wham!* Oh that's close enough." - TheBeal
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AllisKidD21
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PostSubject: Re: Manco Streaker Mini Bike   Manco Streaker Mini Bike - Page 2 Icon_minitimeFri Jun 14, 2019 9:59 pm

Got a new clutch for the little hot rod installed today:

Manco Streaker Mini Bike - Page 2 20190676

Much better now. I tell ya this thing moves buddy, the take-off is a lot better with the impoved low end power of the engine and the new clutch, and at top end she really screams! I think I can hear the governor trying to back the engine off a bit when I hold it wide open, which is a little annoying, but it stops me from blowing it up I guess, haha. If I ever get sick of it I can pop the side cover off and yank the fly weights easy enough.

For now I'm loving the upgrades though! Can't wait to try and take down my cousins bike with it, hahaha.

_______________________________________________
"This'll either wake you up or put you to sleep forever!"- Red Green         "Just took a center punch *Wham!* Oh that's close enough." - TheBeal
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PostSubject: Re: Manco Streaker Mini Bike   Manco Streaker Mini Bike - Page 2 Icon_minitimeSat Jun 15, 2019 12:35 am

Nice!  I see you even painted the spring blue.

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PostSubject: Re: Manco Streaker Mini Bike   Manco Streaker Mini Bike - Page 2 Icon_minitimeSat Jun 15, 2019 2:01 am

Nice engine build! I seen the washer thing done on automotive heads when they rebuilt them. The idea there was to get the spring compressed to factory specs. Sometimes the spring would weaken over time so to bring the spring back to factory spec spring rate on a closed valve the rebuilder would shim up the spring to the right tension.

As long as you are not in coil bind, you are good. And with a little more tension on the spring too, to get rid of that nasty valve float. Manco Streaker Mini Bike - Page 2 2731072446

The spark plug relief is a good idea done on the head. You can take it a step further, when servicing the spark plug, use a sharpy to mark the ground electrode position on the hex of the spark plug, so when you put the spark plug in you know that the ground electrode inside the cylinder is in the right position when tight.
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PostSubject: Re: Manco Streaker Mini Bike   Manco Streaker Mini Bike - Page 2 Icon_minitimeSat Jun 15, 2019 9:37 am

@MightyRaze wrote:
Nice!  I see you even painted the spring blue.

Thanks Mighty. Haha, yep it was getting a bit rusty so I had to freshen 'er up!

@prancstaman wrote:
Nice engine build! I seen the washer thing done on automotive heads when they rebuilt them. The idea there was to get the spring compressed to factory specs. Sometimes the spring would weaken over time so to bring the spring back to factory spec spring rate on a closed valve the rebuilder would shim up the spring to the right tension.

As long as you are not in coil bind, you are good. And with a little more tension on the spring too, to get rid of that nasty valve float. Manco Streaker Mini Bike - Page 2 2731072446

The spark plug relief is a good idea done on the head. You can take it a step further, when servicing the spark plug, use a sharpy to mark the ground electrode position on the hex of the spark plug, so when you put the spark plug in you know that the ground electrode inside the cylinder is in the right position when tight.

Thanks prancstaman! Yeah I was thinking of preventing valve float when I shimmed them up. I guess I can't really take full advantage of it until I completely remove the governor, but at that point I might wanna upgrade some internals anyways, haha.

_______________________________________________
"This'll either wake you up or put you to sleep forever!"- Red Green         "Just took a center punch *Wham!* Oh that's close enough." - TheBeal
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PostSubject: Re: Manco Streaker Mini Bike   Manco Streaker Mini Bike - Page 2 Icon_minitimeSun Jun 16, 2019 10:54 pm

Had the little bike back in the garage for some tinkering yesterday, unfortunately it wasn't running like I wanted it to:

Manco Streaker Mini Bike - Page 2 20190677

But I went through the carb really good and sealed up the gasket surfaces, and she's doing good now!

Used my new temperature reader gun to check the head after a good run:

Manco Streaker Mini Bike - Page 2 20190678

Bought that little unit on sale, quite handy!

Oh also my choke cable wasn't really working due to the cable holder being way too far from the carb, so I ended up making a  little mount that's much closer to the choke lever:

Manco Streaker Mini Bike - Page 2 20190679

Works fantastic!

Then she was loaded up and taken out to the farm for some test running!

Manco Streaker Mini Bike - Page 2 20190680

Found out I still can't out run my cousins bike, (He has a much newer unit with a 6.5hp clone on it) but at least I can keep up a little better now, haha.

Manco Streaker Mini Bike - Page 2 20190682

Either way we had a great time ripping down the gravel roads! Once it dries up here we can do a bit more riding and what not,  should be lots of fun!

_______________________________________________
"This'll either wake you up or put you to sleep forever!"- Red Green         "Just took a center punch *Wham!* Oh that's close enough." - TheBeal
                                                                       ----Uploading Pictures----
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- Toro Rat Rod Tractor Build
        - Ford LT 110 Off-Road Build
        - Craftsman GT 6000 Off-Road Build
        - John Deere 110 Basic Off-Road Build
        - Allis B-110, Case 444, WH 655, Bolens Versamatic -
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PostSubject: Re: Manco Streaker Mini Bike   Manco Streaker Mini Bike - Page 2 Icon_minitime

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