Document:

AMENDED
LOCK-UP AGREEMENT

    

    This AMENDED LOCK-UP AGREEMENT, dated
and effective as of January ___, 2010 (the "Amended Agreement"),
is entered into by and among China Electric Motor, Inc. (formerly known as SRKP
21, Inc., hereinafter referred to as the “Company”), WestPark
Capital, Inc.  (“WestPark”), Roth
Capital Partners, LLC (“Roth” and together
with WestPark, the “Underwriters”), and
the undersigned security holder of the Company (the “Securityholder”).  The
Company, the Underwriters and the Securityholder are collectively referred to
herein as the “Parties.”  Terms
not defined in this Amended Agreement shall have the meanings as set forth in
the Agreement (as defined below).

    

    WITNESSETH:

    

    WHEREAS, the Company and the
Securityholder entered into that certain Lock-Up Agreement attached as Exhibit A ( the
“Agreement”);

    

    WHEREAS, the Parties desire to amend
the Agreement by entering into this Amended Agreement due to the increase in
size of the Company’s public offering of its common stock contemplated pursuant
to that certain registration statement on Form S-1 (File No. 333-162459)
(the “Registration Statement”) filed with the Securities and Exchange Commission
(the “Commission”) in which the Securityholder is named as a selling
stockholder.

    

    NOW, THEREFORE, for good and valuable
consideration and in consideration of the respective representations,
warranties, covenants and agreements set forth in the Agreement, the Parties
hereby agree to amend the Agreement as follows:

    

    AGREEMENT:

    

    1.           The
fourth (4th) full
paragraph of the Agreement is hereby amended and restated in its entirety as
follows:

    

      
All shares of the Company’s Common Stock held by the undersigned shall be
released from the Lock-Up Restrictions on the date that is six (6) months
subsequent to the date on which the Company’s Common Stock begins to be listed
or quoted on either the New York Stock Exchange, NYSE Amex, NASDAQ Global
Market, NASDAQ Capital Market or the OTC Bulletin Board.  The
Underwriters, in their discretion, may release from the Lock-up Restrictions
some or all the undersigned’s shares of the Company’s Common Stock earlier than
the schedule set forth in this Lock-up Agreement.

    

    3.           Except
as amended herein, the Agreement shall remain in full force and
effect.

    

    4.           This
Amended Agreement may be executed in any number of counterparts, each of which
shall be an original, but which together constitute one and the same
instrument.  This Amended Agreement may be executed and delivered by
facsimile.

    

    
      
        
        

      

      
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    IN
WITNESS WHEREOF, the undersigned has executed this Amended Lock-Up Agreement as
of the date first written above.

     

    
      
        	
                 
      

              
	
                Printed
      Name of Securityholder

              
	 
      
	Signature
      	 	
                 

              
	 
      
	By:
      	 	 	
                 

              
	 
      
	

                Title
      (if applicable): 

              	  

      

    

    
      
        
          
            
              
                
                  
                    
                      
                        
                          
                            
                              
                                
                                  
                                    
                                      
                                        
                                          
                                            
                                              
                                                
                                                  
                                                    
                                                      
                                                        
                                                          
                                                             

                                                          

                                                        

                                                      

                                                    

                                                  

                                                

                                              

                                            

                                          

                                        

                                      

                                    

                                  

                                

                              

                            

                          

                        

                      

                    

                  

                

              

            

          

        

      

    

    [SIGNATURE
PAGE FOR COMPANY AND UNDERWRITERS TO FOLLOW]

    
      
         

      

      
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    IN WITNESS WHEREOF, the undersigned has
executed this Amended Lock-Up Agreement as of the date first written
above.

     

    
      
        
          
            
              
                	
                        CHINA
      ELECTRIC MOTOR, INC.

                      
	 
      
	
                         

                      
	
                        By:  Yue
      Wang

                      
	
                        Its:  Chief
      Executive Officer

                      
	 
      
	
                        WESTPARK
      CAPITAL, INC.

                      
	 
      
	
                         

                      
	
                        By:  Richard
      Rappaport

                      
	
                        Its:  President

                      
	 
      
	
                        ROTH
      CAPITAL PARTNERS, LLC

                      
	 
      
	
                         

                      
	
                        By:

                      
	
                        Its:

                      

              

            

          

        

      

    

     

    
      
        
        

      

      
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    EXHIBIT
A

     

    LOCK-UP
AGREEMENT

     

    
      
        
        

      

      
        - 4
-LOCK-UP
AGREEMENT

    

    January
[__], 2010

    

    China
Electric Motor, Inc.

    Sunna
Motor Industry Park,

    Jian’an
Fuyong Hi-Tech Park, Baoan District

    Shenzhen,
Guangdong, China

    Attention:
Yue Wang

    

    Roth
Capital Partners, LLC

    24
Corporate Plaza

    Newport
Beach, CA 92660

    

    WestPark
Capital, Inc.

    1900
Avenue of the Stars, Suite 310

    Los
Angeles, CA 90067

    

    The undersigned is a security holder of
China Electric Motor, Inc. (the “Company”).  The
undersigned hereby delivers this Lock-up Agreement to the Company.

    

    The Company’s private offering of
shares of its common stock, $0.0001 par value per shares (“Common Stock”) closed
in a series of tranches, with the final tranche closing on October 6, 2009 (the
“Private
Offering”).  The undersigned recognizes that it is in the best
financial interests of the Company and of the undersigned, as a stockholder of
the Company, that the securities of the Company held by the undersigned be
subject to certain restrictions. In recognition of the benefit that will be
conferred upon the undersigned as a security holder of the Company and for other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the undersigned irrevocably agrees as follows:

    

    Other than as set forth below, the
undersigned shall not: (a) sell, assign, exchange, transfer, pledge, distribute
or otherwise dispose of (i) any securities of the Company held by the
undersigned or (ii) any interest (including, without limitation, an option to
buy or sell) in any such securities, in whole or in part, and no such attempted
transfer shall be treated as effective for any purpose; or (b) engage in any
transaction in respect to any such securities held by the undersigned or any
interest therein, the intent or effect of which is the effective economic
disposition of such shares (including, but not limited to, engaging in put,
call, short-sale, straddle or similar market transactions) (the foregoing
restrictions are referred to herein as “Lock-Up
Restrictions”).

    

    All securities of the Company held by
the undersigned shall be released from the Lock-Up Restrictions on the date that
is eight (8) months subsequent to the date on which the Company’s Common Stock
begins to be listed or quoted on either the New York Stock Exchange, NYSE Amex,
NASDAQ Global Market, NASDAQ Capital Market or the OTC Bulletin
Board.  Roth Capital Partner, LLC and WestPark Capital, Inc.(the
“Underwriters”), in their discretion, may release from the Lock-up Restrictions
some or all the undersigned’s shares of the Company’s Common Stock earlier than
the schedule set forth in this Lock-up Agreement.

    

    The certificates evidencing the Company
Common Stock held by the undersigned shall bear a legend as set forth below (the
“Lock-Up Legend”) and such Legend shall remain during the term of this Lock-Up
Agreement as set forth above:

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    

    THE
SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO TRANSFER RESTRICTIONS SET
FORTH IN THAT CERTAIN LOCK-UP AGREEMENT BY AND BETWEEN THE COMPANY, A DELAWARE
CORPORATION, AND THE HOLDER HEREOF (THE “LOCK-UP AGREEMENT”), AND MAY NOT BE
SOLD, ASSIGNED, EXCHANGED, TRANSFERRED, ENCUMBERED, PLEDGED, DISTRIBUTED OR
OTHERWISE DISPOSED OF PRIOR TO THAT CERTAIN TIME PERIOD DETAILED IN THE LOCK-UP
AGREEMENT. UPON SATISFACTION OF THE REQUIREMENTS SET FORTH HEREIN, THE ISSUER
AGREES TO REMOVE THIS RESTRICTIVE LEGEND (AND ANY STOP ORDER PLACED WITH THE
TRANSFER AGENT) UPON THE EXPIRATION OF THE TIME PERIOD SPECIFIED IN THE LOCK-UP
AGREEMENT.  A COPY OF THE LOCK-UP AGREEMENT IS AVAILABLE FOR REVIEW AT
THE PRINCIPAL EXECUTIVE OFFICE OF THE ISSUER.

    

    IN WITNESS WHEREOF, the undersigned has
executed this Lock-Up Agreement as of the date first written above.

    

    
      
        
          
            
              
                
                  
                    
                      
                        
                          
                            
                              
                                
                                  
                                    	 
      
	
                                            Printed
      Name of Holder

                                          
	 
      
	      
                                            Signature

                                          	
                                             

                                          
	 
      
	
                                            By:

                                          	 
      
	 
      
	      
                                            Title (if applicable):

                                          	
                                             

                                          

                                  

                                

                              

                            

                          

                        

                      

                    

                  

                

              

            

          

        

      

    

    

    
      
         

      

      
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