Crank seals?! - Page 3 - Pocket Bike Forum - Mini Bikes
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post #41 of 57 (permalink) Old 3 Weeks Ago
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Re: Crank seals?!

Quote:
Originally Posted by Tenchuz4 View Post
You know your stuff, only engine Iíve worked on is the engine I have now lol. I donít have anything to measure my squish, the most I could do is use some solder and post the pic. So you suggest I put the 72 back in? I need to run the bike again to hear how it sounds above and below 3/4 throttle, it just felt a bit ď laggyĒ but it was still quick! My clutch could of been slipping a bit as well I think, I need to deglaze them along with the clutch drum.
Your bike sounds real good
Thanks but its supposed to sound more like this...This is what that homemade stubby pipe sounds like and revs like with a pumper carb instead of a toiletbowl carb

[IMG]033 by Dizzy Gillespie, on Flickr[/IMG]

Heres a stock engine with toiletbowl carb...LOL

bone stock cag by Dizzy Gillespie, on Flickr


I suggest you relieve the backpressure first...Ö...Pull the inner part out of the stinger and leave it open then retry with the 72mainjet...Ö..

Have you tried the 70 yet...I have a feeling if you had the needle located on the 5th notch with the 72 youre gonna be too lean on the 70 from 5/8- WOT...

Get a good sparkplug too...Ö.

FYI Ive found that ovalized inlet taperported carbs work best for your situation...




Last edited by CAM2; 3 Weeks Ago at 07:32 PM.
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post #42 of 57 (permalink) Old 3 Weeks Ago
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Re: Crank seals?!

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Originally Posted by Tenchuz4 View Post
Got everything together now. Have not had time to ride it yet. Man let me tell you, removing that gasket added so much compression. It going to be hard to pull start it now lol : ).

What mount would I need to convert to these newer brakes? The newer brakes are just cheaper, only found 1 seller that sells the one I have. They are asking for $20 for just the front caliper. I see a bunch of these newer brakes online but no mounts for them?
These are the brakes I have now.
2nd picture is the newer type of brakes.
What sucks is my brake calipers are fine, but I lost the piston that pushes against the pads ( circular piece with a metal tube in the center ). I grinded a penny down and put it in there and added jb weld to fill the gaps. It works ok, but doesnít give me the braking power Iím looking for, and it seems I can only get that piece by buying a brand new brake.
You do know that in the center of the adjustment bolt for the pads theres a small allen head wrench provision to hold the screw while manipulating the nut.....

Looking at the new caliper it looks like youre gonna have to modify the bracket you have on the frontwheel in order for it to work and its very possible too as a lot of my cags utilized that same caliper....




Theyre mounted like this...Ö.






Last edited by CAM2; 3 Weeks Ago at 12:20 PM.
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post #43 of 57 (permalink) Old 3 Weeks Ago
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Re: Crank seals?!

Can't wait for the reply, I am confused, He put a nickle and sealed it, how is it suppose to move, it's a cable brake, what needs to be seal, he lost a part, hope was not the stud w/ the adj nut. Might have to look at one of my calipers, I have the same type bracket and caliper on my QC 50 mini dirt bike forks. Think they are the old style, maybe 2009.
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post #44 of 57 (permalink) Old 3 Weeks Ago
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Re: Crank seals?!

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Originally Posted by EPR View Post
Can't wait for the reply, I am confused, He put a nickle and sealed it, how is it suppose to move, it's a cable brake, what needs to be seal, he lost a part, hope was not the stud w/ the adj nut. Might have to look at one of my calipers, I have the same type bracket and caliper on my QC 50 mini dirt bike forks. Think they are the old style, maybe 2009.
Most likely...Ö..

Last edited by CAM2; 3 Weeks Ago at 01:48 PM.
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post #45 of 57 (permalink) Old 3 Weeks Ago Thread Starter
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Quote:
Originally Posted by EPR View Post
Can't wait for the reply, I am confused, He put a nickle and sealed it, how is it suppose to move, it's a cable brake, what needs to be seal, he lost a part, hope was not the stud w/ the adj nut. Might have to look at one of my calipers, I have the same type bracket and caliper on my QC 50 mini dirt bike forks. Think they are the old style, maybe 2009.
I put a little bit of jb weld in the hole, grinded a penny down to fit, then put more jb on top, making sure it didn’t seep into the cracks so the brakes can open and close. So yea because of the jb weld, I can’t use the Allen key adjustment lol brakes work fine atm

Last edited by Tenchuz4; 3 Weeks Ago at 12:10 AM.
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post #46 of 57 (permalink) Old 3 Weeks Ago Thread Starter
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Quote:
Originally Posted by CAM2 View Post
Quote:
Originally Posted by Tenchuz4 View Post
You know your stuff, only engine I’ve worked on is the engine I have now lol. I don’t have anything to measure my squish, the most I could do is use some solder and post the pic. So you suggest I put the 72 back in? I need to run the bike again to hear how it sounds above and below 3/4 throttle, it just felt a bit “ laggy” but it was still quick! My clutch could of been slipping a bit as well I think, I need to deglaze them along with the clutch drum.
Your bike sounds real good
Thanks but its supposed to sound more like this...This is what that homemade stubby pipe sounds like and revs like with a pumper carb instead of a toiletbowl carb

[IMG]033 by Dizzy Gillespie, on Flickr[/IMG]

Heres a stock engine with toiletbowl carb...LOL

bone stock cag by Dizzy Gillespie, on Flickr


I suggest you relieve the backpressure first...…...Pull the inner part out of the stinger and leave it open then retry with the 72mainjet...…..

Have you tried the 70 yet...I have a feeling if you had the needle located on the 5th notch with the 72 youre gonna be too lean on the 70 from 5/8- WOT...

Get a good sparkplug too...….

FYI Ive found that ovalized inlet taperported carbs work best for your situation...



I don’t have the means to do that exhaust mod atm : (
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post #47 of 57 (permalink) Old 3 Weeks Ago Thread Starter
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Quote:
Originally Posted by CAM2 View Post
Quote:
Originally Posted by Tenchuz4 View Post
Got everything together now. Have not had time to ride it yet. Man let me tell you, removing that gasket added so much compression. It going to be hard to pull start it now lol : ).

What mount would I need to convert to these newer brakes? The newer brakes are just cheaper, only found 1 seller that sells the one I have. They are asking for $20 for just the front caliper. I see a bunch of these newer brakes online but no mounts for them?
These are the brakes I have now.
2nd picture is the newer type of brakes.
What sucks is my brake calipers are fine, but I lost the piston that pushes against the pads ( circular piece with a metal tube in the center ). I grinded a penny down and put it in there and added jb weld to fill the gaps. It works ok, but doesn’t give me the braking power I’m looking for, and it seems I can only get that piece by buying a brand new brake.
You do know that in the center of the adjustment bolt for the pads theres a small allen head wrench provision to hold the screw while manipulating the nut.....

Looking at the new caliper it looks like youre gonna have to modify the bracket you have on the frontwheel in order for it to work and its very possible too as a lot of my cags utilized that same caliper....




Theyre mounted like this...….





Yea I used jb weld to fill in the part that engages the brakes, so no Allen key adjustment for me. I just pulled the brake tight until they barely dragged, then tightened them back up.

Last edited by Tenchuz4; 3 Weeks Ago at 12:13 AM.
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post #48 of 57 (permalink) Old 3 Weeks Ago Thread Starter
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I did a WOT chop on ngk bm6a plugs using the 70 jet. I realize my clip is what is bogging, ( bike barely moved unless I full throttled) I need to raise it ( currently on lowest ) and use some 100 grit sandpaper on the clutch and drum.( they are old. )The plug looks lean, will put the 72 back on and check the plug again. Here is the plug from the 70 WOT. I’m running about 70:1 with Opti 2 oil
Left is the plug, right is a brand new plug
Attached Images
File Type: jpeg 6E5E3767-7CD4-4BE9-9AF5-6CCB6186EDEE_1584074995495.jpeg (181.0 KB, 5 views)

Last edited by Tenchuz4; 3 Weeks Ago at 04:22 AM.
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post #49 of 57 (permalink) Old 3 Weeks Ago Thread Starter
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LOL Yup, exactly, it can’t move! Lol. I jb welded it. That why the Allen key doesn’t work haha

This the part I filled in, this is a spare I have, that’s also missing that part lol.
Attached Images
File Type: jpg 4947C09B-7489-4B82-B8E6-DBC4B85001BC_1584077302483.jpg (326.9 KB, 3 views)

Last edited by Tenchuz4; 3 Weeks Ago at 12:29 AM.
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post #50 of 57 (permalink) Old 3 Weeks Ago Thread Starter
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Thank you guys for taking the time to help me out, I respect the knowledge you guys have with these engines. I’m not looking into doing anymore mods currently, just want to get the bike running decent, and honestly this is the best my bike has ran In a while. Only thing that’s out of whack is my low end because it’s running to rich, will take a test ride tomorrow with the clip raised up a notch
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post #51 of 57 (permalink) Old 3 Weeks Ago
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Re: Crank seals?!

If your starting and stopping a lot, or trying to cruse on & off with
the throttle all the time, going to have more clutch pad wear. It's full throttle or brake then full throttle, especially if you have hp clutch springs.
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post #52 of 57 (permalink) Old 3 Weeks Ago
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Re: Crank seals?!

Quote:
Originally Posted by Tenchuz4 View Post
Thank you guys for taking the time to help me out, I respect the knowledge you guys have with these engines. Iím not looking into doing anymore mods currently, just want to get the bike running decent, and honestly this is the best my bike has ran In a while. Only thing thatís out of whack is my low end because itís running to rich, will take a test ride tomorrow with the clip raised up a notch
Well I guess your stuck with what ya get then from what ya got and how its setup because without the proper mods you're always gonna have tuning problems with that pipe but sounds like you may be leaving that up to the next owner to figure out...

Good luck with the sale..
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post #53 of 57 (permalink) Old 2 Weeks Ago Thread Starter
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Yea I have a lightened aluminum clutch and the thicker springs ( came off the heavier/steel? clutch ) and was trying to cruise, so thats good to know now! @EPR

Last edited by Tenchuz4; 2 Weeks Ago at 09:10 PM.
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post #54 of 57 (permalink) Old 2 Weeks Ago Thread Starter
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Quote:
Originally Posted by CAM2 View Post
Quote:
Originally Posted by Tenchuz4 View Post
Thank you guys for taking the time to help me out, I respect the knowledge you guys have with these engines. I’m not looking into doing anymore mods currently, just want to get the bike running decent, and honestly this is the best my bike has ran In a while. Only thing that’s out of whack is my low end because it’s running to rich, will take a test ride tomorrow with the clip raised up a notch
Well I guess your stuck with what ya get then from what ya got and how its setup because without the proper mods you're always gonna have tuning problems with that pipe but sounds like you may be leaving that up to the next owner to figure out...

Good luck with the sale..
I understand, I just don’t have a welder or cutters right now for the job, I bet that pipe is doing me no justice. I have pride in my ugly pocket bike, no way I’m selling it lol
It has blue wheels, and I sanded the plastics and you can see all the colors I spray painted it over the years, has a mixture of green, gray, black and white lol. And the wheels to ( not ) match LOL.

So yea the bike will run crappy until I can get that exhaust mod done. Like you said 72 was small for that head kit, 75 is next, thanks for all the information, it was noted!

Last edited by Tenchuz4; 2 Weeks Ago at 09:01 PM.
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post #55 of 57 (permalink) Old 2 Weeks Ago
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Re: Crank seals?!

There are other hp exhausts you can buy off the internet, anything is better than stock. I have a Pro Jet SS Cag exhaust on some of my bikes, around $100 if you can find one. The under/over pipe is in the photo.
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File Type: jpg Exhaust Pipe Mods.jpg (322.1 KB, 3 views)
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post #56 of 57 (permalink) Old 2 Weeks Ago Thread Starter
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Originally Posted by EPR View Post
There are other hp exhausts you can buy off the internet, anything is better than stock. I have a Pro Jet SS Cag exhaust on some of my bikes, around $100 if you can find one. The under/over pipe is in the photo.
I have a jet pro/pro jet, whichever is the knock off I have that one. That under over exhaust looks nice!
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post #57 of 57 (permalink) Old 2 Weeks Ago
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Re: Crank seals?!

The Jet Pro is the knock off, have 3 of them total, the first one was thicker metal than the last two I bought, they did the same thing to the frames too. The Pro Jet is better than the under exhaust, which I made into a side pipe on my Lucky 7 cause I tried 10 other Cag exhaust I have and would not fit the tight narrow frame, The foot pegs are on the front axle.
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