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Post subject: Engine after rebuild
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paul350lc Suburban Commuter |
Just had engine rebuilt. New crank/pistons/bore.
Got some premix in tank just to get make sure it does not seize as oil pump was a little slow to get started.
Now, it just lacks power, it struggles to rev, it gets to about 4-5,000 then nothing really - just total lack of umph.
It feels like it's either clogged up inside with all the oil it's getting(?) spark plugs are wet as hell.
Any ideas? my worst fears are the pistons/bore are knackered (but how?) or more to do with way too much oil carb' mix and needs a good set up.
I have put neat petrol in but maybe still getting a little too much premix left in the tank.
Guy who helped me rebuild it (races LC's) is away on holiday so i cannot get hold of him to ask so hence i am asking the forum. My knowledge of engines/carbs is limited....'I am a stonemason Jim, not a mechanic'.
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Posted: Sat May 31, 2008 10:22 pm
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ief  Powerband Master Joined: 27 Jan 2004 Total posts: 774 Location: netherlands |
can't imagine it's the oil, how's the aitfilter? carbs clean?
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Posted: Sat May 31, 2008 10:49 pm
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gary-rd-robbo![[RD/RZ Blood Donor]](../img/pipsvip.jpg "RD/RZ Blood Donor")
RD/RZ Blood Donor One-handed Stoppie! |
run it in first b4 jumping to bad conclutions..have you fitted stator corect and timing spot on???
leave the premix and alter the pump to add a tad extra oil during run in etc...give the engine chance to settle though...i supect timing is out /stator position.
gaz
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Posted: Sat May 31, 2008 11:19 pm
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hybrid Rear-wheel Steering! Joined: 07 Aug 2003 Total posts: 2547 |
Dont forget that adding oil to your fuel will give you a lean condition if you don't jet up.
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Posted: Sun Jun 01, 2008 12:36 am
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dino1790 Find me a Road! Joined: 04 May 2008 Total posts: 17 Location: gloucestershire, england |
you should'a bought that rd-ypvs ebgine rebuild cd off ebay and done it yerself...... that's what i'm gonna do.
sorry, got ginned up tonight. probably don't know what the f""k i'm talkin about.
been sensible up till now
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Posted: Sun Jun 01, 2008 12:43 am
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| paddyontour Joined: 29 Oct 2007 Total posts: 239 |
I don't know if this will be any help bud, but have you checked the carbs? (What, Again  )
My F2 was running grand up to about the same and then just bogging right down once you opened the throttle - turned out, one of the main jets 'had come lose' and was sitting in the float bowl 
When you say that it struggles to rev, is this the case no matter what the revs? - or just when it gets to 4/5k 
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Posted: Sun Jun 01, 2008 5:10 pm
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paul350lcSuburban Commuter |
| paddyontour wrote: |
I don't know if this will be any help bud, but have you checked the carbs? (What, Again )
My F2 was running grand up to about the same and then just bogging right down once you opened the throttle - turned out, one of the main jets 'had come lose' and was sitting in the float bowl
When you say that it struggles to rev, is this the case no matter what the revs? - or just when it gets to 4/5k |
It struggles when getting to 4000, it just doesn'r rev clean, it's like revving with the choke full on (now there's a thought!)
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Posted: Sun Jun 01, 2008 8:33 pm
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TrigOne-handed Stoppie! Joined: 04 Aug 2003 Total posts: 2390 Location: On Cloud 9 |
So, lets get this right.............
You have built the engine with plenty of oil, you are running auto lube-pumping oil into the engine AND you are running pre-mix as well.
Hmmmmmmmmmmmmmmm and its not running cleanly.
Wonder what that is 
Check the rear sprocket, must be that
Put neat fuel in it, and new plugs.
Then rev it till it clears.
Bloody thing needs a de coke already!
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Posted: Sun Jun 01, 2008 9:24 pm
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paul350lcSuburban Commuter |
| Trig wrote: |
So, lets get this right.............
You have built the engine with plenty of oil, you are running auto lube-pumping oil into the engine AND you are running pre-mix as well.
Hmmmmmmmmmmmmmmm and its not running cleanly.
Wonder what that is
Check the rear sprocket, must be that
Put neat fuel in it, and new plugs.
Then rev it till it clears.
Bloody thing needs a de coke already! |
Less of sarcasm Trig! I have put neat in if you read above (okay, maybe a pint left in) but will do as you say.
Oh, thanks for rear sprocket tip.
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Posted: Mon Jun 02, 2008 6:21 am
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TrigOne-handed Stoppie! Joined: 04 Aug 2003 Total posts: 2390 Location: On Cloud 9 |
| paul350lc wrote: |
| Trig wrote: |
So, lets get this right.............
You have built the engine with plenty of oil, you are running auto lube-pumping oil into the engine AND you are running pre-mix as well.
Hmmmmmmmmmmmmmmm and its not running cleanly.
Wonder what that is
Check the rear sprocket, must be that
Put neat fuel in it, and new plugs.
Then rev it till it clears.
Bloody thing needs a de coke already! |
Less of sarcasm Trig! I have put neat in if you read above (okay, maybe a pint left in) but will do as you say.
Oh, thanks for rear sprocket tip. |
Where you based?
Or shall I look for the big cloud of blue smoke?
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Posted: Mon Jun 02, 2008 7:20 am
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jante350 RD/RZ Jedi Master Joined: 05 Aug 2003 Total posts: 5161 Location: Bergen, Norway |
This sounds like you have swapped over the carb slides. Check if the cutaway on the slides is facing the airbox.
Also recheck carbs, to make sure your not on choke all the time, or anything else is blocking up the airways... is there a rats nest in your airbox?
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Posted: Mon Jun 02, 2008 8:46 am
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abbeyFind me a Road! Joined: 11 Jan 2008 Total posts: 16 |
Hi Paul if you are stuck give me a call on 07802 896103 as I am only up the road from you I may be able to help you out
Mick
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Posted: Mon Jun 02, 2008 9:03 am
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