Need help on a clone GX200 Please! - Snowblower Forum : Snow Blower Forums
Reply
 
LinkBack Thread Tools
post #1 of 21 Old 08-13-2015, 03:47 PM Thread Starter
Senior Member
 
Join Date: Feb 2014
Location: Montreal, QC.
Posts: 110
Post Thanks / Like
Thanks (Given): 4
Thanks (Received): 10
Likes (Given): 0
Likes (Received): 20
Need help on a clone GX200 Please!

So, 2 years ago I got a chinese 3000 watt generator that had fallen off the back of a pickup (price was right $0). Some motor mounts were broken and the crankcase was cracked so oil leaked out quickly. So I bought a replacement clone 168F motor from fleabay (he is still selling them)



Now I'm finally getting things together. Found out the shaft on the new engine was longer than the old one, so I swapped the old crankshaft into the new motor & put things back together. Everything was going well until I tried to start it, no go!

Tested spark, ok. Plenty of fuel, yes. Tried starting fluid, no go. So I checked the compression & it's showing only 30 lbs. on what should be a new engine. I even went so far as to loosen the valve rockers so the valves would remain closed & shot in some oil(Providing a completely sealed combustion chamber I thought), still only 30 lbs. compression!!!

What am I missing??? I really need some of your collective wisdom here.

Cheers
Paul
GtWtNorth is offline  
Sponsored Links
Advertisement
 
post #2 of 21 Old 08-13-2015, 04:02 PM
Moderator
 
Shryp's Avatar
 
Join Date: Jan 2011
Location: Cleveland, OH
Posts: 4,159
Post Thanks / Like
Thanks (Given): 1
Thanks (Received): 196
Likes (Given): 6
Likes (Received): 250
Did you open the throttle when you tested the compression. Also, I am not sure, but if you make the intake valve not open, that aren't you actually blocking the air from getting in there? Wouldn't that result in lower compression?

Please direct all snow blower questions to the forums and not to me with PMs.
Shryp is offline  
Post Thanks / Like - 0 Thanks, 1 Likes, 0 Dislikes
Likes Kiss4aFrog liked this post
post #3 of 21 Old 08-13-2015, 04:15 PM
Senior Member
 
scrappy's Avatar
 
Join Date: Dec 2014
Location: New Jersey
Posts: 537
Post Thanks / Like
Thanks (Given): 6
Thanks (Received): 39
Likes (Given): 36
Likes (Received): 91
To check compression both valves need to be 'working' and throttle wide open. If you were doing a leakdown test then yes both valves closed.

My guess is the cam timing is off, even with the marks lined up. Those clones change all kinds of stuff every year, even if its the same displacement and year.

Easy enough to get an idea if the cam timing is off. The valve overlap (time when intake is opening and exhaust closeing) should be very close to TDC.

Last edited by scrappy; 08-13-2015 at 04:37 PM.
scrappy is offline  
Post Thanks / Like - 0 Thanks, 1 Likes, 0 Dislikes
Likes Kiss4aFrog liked this post
post #4 of 21 Old 08-13-2015, 05:27 PM Thread Starter
Senior Member
 
Join Date: Feb 2014
Location: Montreal, QC.
Posts: 110
Post Thanks / Like
Thanks (Given): 4
Thanks (Received): 10
Likes (Given): 0
Likes (Received): 20
Yeah, I just realized that with the intake closed it can't take in air to compress! I guess I'll take off the head to check the internal condition & change the head gasket.
Maybe those engines he's selling are "new" seconds?
GtWtNorth is offline  
post #5 of 21 Old 08-13-2015, 05:34 PM
Senior Member
 
scrappy's Avatar
 
Join Date: Dec 2014
Location: New Jersey
Posts: 537
Post Thanks / Like
Thanks (Given): 6
Thanks (Received): 39
Likes (Given): 36
Likes (Received): 91
Quote:
Originally Posted by GtWtNorth View Post
Yeah, I just realized that with the intake closed it can't take in air to compress! I guess I'll take off the head to check the internal condition & change the head gasket.
Maybe those engines he's selling are "new" seconds?
Before you waste a head gasket try what I suggested.
scrappy is offline  
post #6 of 21 Old 08-13-2015, 08:05 PM
Senior Member
 
Join Date: Nov 2013
Location: SW Ohio
Posts: 3,175
Post Thanks / Like
Thanks (Given): 0
Thanks (Received): 142
Likes (Given): 0
Likes (Received): 291
Timing?

Garage:
MTD....2 stage(modern 8.5 HP) not my favorite
Honda HS622 TA-B - acquired at an auction- nice machine for it's size.
Toro S-140- Picked it up on trash day... it runs, sort of.
Yamaha YS 240 TB "Ricky" latest Craigslist find- on the bench now.
db9938 is offline  
post #7 of 21 Old 08-14-2015, 07:07 AM
Senior Member
 
CarlB's Avatar
 
Join Date: Jan 2011
Location: Southern New Jersey
Posts: 697
Post Thanks / Like
Thanks (Given): 1
Thanks (Received): 29
Likes (Given): 1
Likes (Received): 66
I'm on Scrappy on this one. Make sure the overlap between intake and exhaust is very near tdc on the piston. The timing marks on the new camshaft gear may be wrong.

Maybe put your old camshaft in the new engine.
CarlB is offline  
Post Thanks / Like - 0 Thanks, 1 Likes, 0 Dislikes
Likes Kiss4aFrog liked this post
post #8 of 21 Old 08-14-2015, 07:37 AM Thread Starter
Senior Member
 
Join Date: Feb 2014
Location: Montreal, QC.
Posts: 110
Post Thanks / Like
Thanks (Given): 4
Thanks (Received): 10
Likes (Given): 0
Likes (Received): 20
Thanks guys, I'll try your suggestions Scrappy. Maybe I can film the action and post that.
Cheers
Paul
GtWtNorth is offline  
post #9 of 21 Old 08-14-2015, 12:43 PM
Senior Member
 
Join Date: Jun 2014
Location: Shoreline, CT
Posts: 3,445
Post Thanks / Like
Thanks (Given): 103
Thanks (Received): 375
Likes (Given): 466
Likes (Received): 477
+1 with a timing issue.
YSHSfan is offline  
post #10 of 21 Old 08-14-2015, 01:58 PM
Super Moderator
 
Kiss4aFrog's Avatar
 
Join Date: Nov 2013
Location: Hudson, WI
Posts: 9,137
Post Thanks / Like
Thanks (Given): 510
Thanks (Received): 681
Likes (Given): 3844
Likes (Received): 1478
Garage
Another thing to check is the compression release. It's handy for pull starting but can be misleading when doing a compression test.

I'm not even saying yours has one just something to check into that might explain the low reading.

.
Make sure the windows are up before the snow plow goes by !!

Please help keep the lights on by subscribing:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Kiss4aFrog is offline  
Post Thanks / Like - 0 Thanks, 1 Likes, 0 Dislikes
Likes 43128 liked this post
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Snowblower Forum : Snow Blower Forums 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 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