Motor identification help please - Page 3 - Pocket Bike Forum - Mini Bikes
 1Likes
Reply
 
LinkBack Thread Tools
post #41 of 122 (permalink) Old 4 Weeks Ago
PBP RACER
 
Chrisi's Avatar
 
Join Date: Aug 2018
Age: 36
Posts: 155
One question, can you open your clutch case when the engine is mounted?

Get your kick with 2 stroke mix
Chrisi is offline  
Sponsored Links
Advertisement
 
post #42 of 122 (permalink) Old 4 Weeks Ago Thread Starter
PBP SENIOR MEMBER
 
Kimjon's Avatar
 
Join Date: Jan 2018
Posts: 282
Quote:
Originally Posted by Chrisi View Post
One question, can you open your clutch case when the engine is mounted?
Yes, easy. Plenty of access to it<img src="https://www.pocketbikeplanet.com/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" />20190811_170835_1565588688913.jpg
Kimjon is offline  
post #43 of 122 (permalink) Old 4 Weeks Ago Thread Starter
PBP SENIOR MEMBER
 
Kimjon's Avatar
 
Join Date: Jan 2018
Posts: 282
How much water (using g 50:50 coolant mix) does the system hold?

I put some in...but it hardly took much to fill it? Perhaps its air locked...or maybe it doesn't need that much to begin with?

I guess I'll start it up and see if it draws more in?

Any hints?
Kimjon is offline  
Sponsored Links
Advertisement
 
post #44 of 122 (permalink) Old 4 Weeks Ago
PBP RACER
 
Chrisi's Avatar
 
Join Date: Aug 2018
Age: 36
Posts: 155
Should be about 750-1000ml,depending on the radiator and the hous diameter, fill in about 500ml,then start the engine and pull the bike in the front up, like a wheely, so the should be the most air out of the system and you can fill up the rest.

Get your kick with 2 stroke mix
Chrisi is offline  
post #45 of 122 (permalink) Old 4 Weeks Ago Thread Starter
PBP SENIOR MEMBER
 
Kimjon's Avatar
 
Join Date: Jan 2018
Posts: 282
Quote:
Originally Posted by Chrisi View Post
Should be about 750-1000ml,depending on the radiator and the hous diameter, fill in about 500ml,then start the engine and pull the bike in the front up, like a wheely, so the should be the most air out of the system and you can fill up the rest.
Thanks. Okay...I have a long way to go, as I think I've only put about 100ml in there right now. I'll leave it overnight and perhaps turn the water pump over with a drill or something similar to work the water through. I'll also try the lifting front up like you've suggested. Thanks.

Last edited by Kimjon; 4 Weeks Ago at 02:55 PM.
Kimjon is offline  
post #46 of 122 (permalink) Old 4 Weeks Ago
Re: Motor identification help please

Mine only holds about 8 to 12oz.

Empty Pockets Racing: The difficult we do, the impossible takes longer.....
EPR is offline  
post #47 of 122 (permalink) Old 4 Weeks Ago Thread Starter
PBP SENIOR MEMBER
 
Kimjon's Avatar
 
Join Date: Jan 2018
Posts: 282
Quote:
Originally Posted by EPR View Post
Mine only holds about 8 to 12oz.
Thanks for feedback. Yeah only holds a few hundred millilitres. About a cup at the most???

https://youtu.be/X2zwPhxAQ4I

First start up!!! Needs a different carburetor to make it run better, but I'll sort that out.
Kimjon is offline  
post #48 of 122 (permalink) Old 4 Weeks Ago Thread Starter
PBP SENIOR MEMBER
 
Kimjon's Avatar
 
Join Date: Jan 2018
Posts: 282
Got it sorted!!! So loud, seriously think I've damaged my hearing. Ear plugs a must!

https://youtu.be/iW9KgtDn1E8
Kimjon is offline  
post #49 of 122 (permalink) Old 4 Weeks Ago Thread Starter
PBP SENIOR MEMBER
 
Kimjon's Avatar
 
Join Date: Jan 2018
Posts: 282
You can see in the second YouTube clip theres a slight coolant leak coming from the bottom of the pull start area. I'm hoping the seals hydrate and seal, otherwise I'll take it apart.

I assume it's from the shaft seal on the drive pulley? Although I took the pull start cover off and it looks dry? So a bit of a mystery. I'll probably just run it and top up if it's not glaringly obvious where its coming from.

Last edited by Kimjon; 4 Weeks Ago at 04:07 AM.
Kimjon is offline  
post #50 of 122 (permalink) Old 4 Weeks Ago
PBP RACER
 
Chrisi's Avatar
 
Join Date: Aug 2018
Age: 36
Posts: 155
Quote:
Originally Posted by Kimjon View Post
You can see in the second YouTube clip theres a slight coolant leak coming from the bottom of the pull start area. I'm hoping the seals hydrate and seal, otherwise I'll take it apart.

I assume it's from the shaft seal on the drive pulley?
That's the problem with the Blata rep engine, there is a shaftseal ring and you could only change this sealing when you demount the crankhous&#x1f622;&#x1f622;.
Attached Images
File Type: jpg 15658590314043749004904162849569_1565859053190.jpg (392.7 KB, 3 views)
File Type: jpg Screenshot_20190815_105838_com_1565859544946.android.chrome.jpg (103.4 KB, 3 views)

Get your kick with 2 stroke mix
Chrisi is offline  
post #51 of 122 (permalink) Old 4 Weeks Ago Thread Starter
PBP SENIOR MEMBER
 
Kimjon's Avatar
 
Join Date: Jan 2018
Posts: 282
Quote:
Originally Posted by Chrisi View Post

That's the problem with the Blata rep engine, there is a shaftseal ring and you could only change this sealing when you demount the crankhous&#x1f622;&#x1f622;.
Oh...hmmmm, not great. I really don't want to do this right now, as we're all racing next week (12 school friends each with a drift trike, which happens once a year).

If I leave it, is it likely to damage the motor?
Kimjon is offline  
post #52 of 122 (permalink) Old 4 Weeks Ago
PBP RACER
 
Chrisi's Avatar
 
Join Date: Aug 2018
Age: 36
Posts: 155
The water destroys the bearing and the water pump won't turn any more, you get an overheating engine maybe an damaged cylinder and so on.

Get your kick with 2 stroke mix
Chrisi is offline  
post #53 of 122 (permalink) Old 4 Weeks Ago Thread Starter
PBP SENIOR MEMBER
 
Kimjon's Avatar
 
Join Date: Jan 2018
Posts: 282
Quote:
Originally Posted by Chrisi View Post
The water destroys the bearing and the water pump won't turn any more, you get an overheating engine maybe an damaged cylinder and so on.
Okay, thanks. I'll repair it then.
Kimjon is offline  
post #54 of 122 (permalink) Old 4 Weeks Ago Thread Starter
PBP SENIOR MEMBER
 
Kimjon's Avatar
 
Join Date: Jan 2018
Posts: 282
Found the leak, it was the overflow bottle cap. It wasn't 100% sealing and the drip followed down a hose, onto another hose...then dripped to ground near motor. So mystery solved.

In other news:

Well, it goes. But it sucks down low! To be honest its possibly a little less power than I was expecting???

Theres not enough room on my drive to get into power band, and that's when it should liven up a lot. But it has zero low down torque. I'll change the rear sprocket for a 78 tooth, from the 68 tooth that's on it now. That will help.

But I think it's just going to need more room to show its potential, which will be the case on race day. The yard we use is about 100m long so it will be awesome on the straights, just not so great on the corners.

Still...I've enjoyed making it and learnt heaps. Thanks for all the help everyone on here provided.

https://youtu.be/zFSAzUNUc-g
Kimjon is offline  
post #55 of 122 (permalink) Old 4 Weeks Ago
PBP RACER
 
Chrisi's Avatar
 
Join Date: Aug 2018
Age: 36
Posts: 155
At what rpm is your clutch currently engaged? It should begin to grip at about 8000rpm, set in warm condition. You also have to make sure that all three arms of the clutch open at the same time. It is also the exhaust is not ideal for this engine, it would have a shorter and thicker exhaust to be mounted.

And with the 14mm carb you will never get the full power of these engine. You can run a 17-19mm carb.

Get your kick with 2 stroke mix
Chrisi is offline  
post #56 of 122 (permalink) Old 4 Weeks Ago
PBP RACER
 
Chrisi's Avatar
 
Join Date: Aug 2018
Age: 36
Posts: 155
Exhaust should look like this ons
Attached Images
File Type: jpg IMG_20171130_163543_1565943169547.jpg (391.9 KB, 3 views)

Get your kick with 2 stroke mix
Chrisi is offline  
post #57 of 122 (permalink) Old 4 Weeks Ago Thread Starter
PBP SENIOR MEMBER
 
Kimjon's Avatar
 
Join Date: Jan 2018
Posts: 282
Quote:
Originally Posted by Chrisi View Post
At what rpm is your clutch currently engaged? It should begin to grip at about 8000rpm, set in warm condition. You also have to make sure that all three arms of the clutch open at the same time. It is also the exhaust is not ideal for this engine, it would have a shorter and thicker exhaust to be mounted.

And with the 14mm carb you will never get the full power of these engine. You can run a 17-19mm carb.
I'll look into it and find out.
Kimjon is offline  
post #58 of 122 (permalink) Old 4 Weeks Ago
Re: Motor identification help please

Yes, you have to take the engine out and split the cases. The china bearings and seals are junk, get the numbers of them and seal size. I bought SKF bearings and Dupont red Viton shaft seal, after mine failed and destroyed the whole engine.

Empty Pockets Racing: The difficult we do, the impossible takes longer.....
EPR is offline  
post #59 of 122 (permalink) Old 4 Weeks Ago
PBP RACER
 
Chrisi's Avatar
 
Join Date: Aug 2018
Age: 36
Posts: 155
You will need 2 pc 6203tn9/c3 bearing for crankshaft
2 pc sealring 17/25/4
2 pc bearing 627 2Z for waterpump
1 pc sealring 10/18/4

And you should check your squish clearance maybe to high.

&#x1f37b;&#x1f37b;

Get your kick with 2 stroke mix

Last edited by Chrisi; 4 Weeks Ago at 02:44 PM.
Chrisi is offline  
post #60 of 122 (permalink) Old 4 Weeks Ago Thread Starter
PBP SENIOR MEMBER
 
Kimjon's Avatar
 
Join Date: Jan 2018
Posts: 282
Thanks guys, perfect information. I have an SKF dealer nearby my work.

For now the leak has gone, so I'm going to run it this weekend.

I went through all the boxes of parts I got when I brought the pocket bikes. There's about 4 complete carburetors in there. Ill measure them up and look for a 19mm one.

I also ordered a 78tooth sprocket and a chain last night and should have it by Tuesday. It takes me about 45 minutes to machine the centre out of the sprocket to fit my rear axle and to redrill the holes to a larger PCD. I think it will make a big difference going from 68 to 78 teeth. I also found a few different clutch sprockets of 6, 7, 8 teeth. I can't recall what is on the front...but if it's more than 6 teeth, I change that out to a 6 tooth to get more lower end torque.

Last edited by Kimjon; 4 Weeks Ago at 06:36 PM.
Kimjon is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pocket Bike Forum - Mini Bikes forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome