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Message started by Ashree on 11/03/18 at 18:57:41

Title: Engine Swap Troubles
Post by Ashree on 11/03/18 at 18:57:41

Hi there, I've recently dropped a 2007 engine into my 2008 s40 as the one that was in it blew a hole in the crank case. I have everything wired up but cant get it to run. The starter cranks, I have a good and consistent spark and and its igniting fuel / ether. the timing marks all seem to line up when at TDC. I'm waiting on a compression tester adapter to arrive to be 100% sure of compression.

I have just read about people having to change the CDI from the same bike to get it to run better. Or possibly changing the rotor from the old engine. I have just pulled the LHS case of both engines and the 2008 one has 4 extra holes drilled into it where as the 2007 one does not.

Anyone have any knowledge or experience on these parts???

Title: Re: Engine Swap Troubles
Post by verslagen1 on 11/03/18 at 19:33:37

You have to swap the cdi between a 96 or later with a 88 or earlier.
not an 07 with an 08, they should have the same timing.
and if it were a timing issue, it would idle with the wrong cdi.
but I don't have any direct experience with those years.
just check the part numbers on an oem fishe to be sure.

If you got them both open, check the distance from the timing mark to the trip plate welded to the outside of the rotor.
If they're the same then there's no difference.
Not to say, someone else didn't swap them cause they had an older bike.

Title: Re: Engine Swap Troubles
Post by Ashree on 11/03/18 at 22:40:39

Just checked the distance from the timing mark, they seem the same. so would i possibly be correct in thinking that it shouldn't be a timing problem?

I assume the only other thing must be compression. I had the exhaust off the other day and tried cranking it. Saw some flames out the exhaust valves intermittently. it definitely makes a different sound when its just the starter motor vs when either the choke is out or starter fluid is sprayed. but never goes far enough as to stay running or even raise the revs to give me hope.

Title: Re: Engine Swap Troubles
Post by verslagen1 on 11/03/18 at 22:59:07

I think a compression test will tell you.
did you adjust the valves?

Title: Re: Engine Swap Troubles
Post by Ashree on 11/03/18 at 23:06:22

I have only taken the top and side cases off to check how things look. haven't touched or measured the valves yet. Had hopes of just putting it in and riding it but obviously isn't happening.
The dismantlers who sold it to me said it arrived without a carb so never fired it up to check it. So im going in kinda blind, I'm hoping they haven't sold me a dud.

Title: Re: Engine Swap Troubles
Post by Ashree on 11/06/18 at 21:44:03

Well my compression tester adapter arrive today. Max it got up to was 60 psi, I guess I found the problem. Now to find my feeler gauges and look at the valve clearances. Not too sure what else to do. I think the dismantlers that sold it to me will be getting a angry email soon

Title: Re: Engine Swap Troublesy
Post by justin_o_guy2 on 11/06/18 at 23:35:36

A dry cylinder isn't good.

Title: Re: Engine Swap Troubles
Post by Dave on 11/07/18 at 08:31:19

64766D69607C6D050 wrote:

Well my compression tester adapter arrive today. Max it got up to was 60 psi, I guess I found the problem.

Disconnect the compression release cable, and make sure you have the throttle wide open when you make the test. Either one of these issues will result in a poor compression reading.

Title: Re: Engine Swap Troubles
Post by batman on 11/07/18 at 12:16:38

I'd also reconnect the exhaust, I don't really think it will alter the compression test , but if later you start the bike ,and it runs, you could damage the valves , (hooking up the air filter couldn't hurt either) The motor tends to run better with both. I'd also pour oil( Flood the top end) , using the valve inspection door ,to fill the "bathtub"for the cam lobes, and a bit through the sparkplug hole to seal/lube the rings for the test or starting. The starter motor can be ruined by cranking to long (more than 10-15 sec.) without letting it cool( about 15-20 min.) in between each try.

Title: Re: Engine Swap Troubles
Post by justin_o_guy2 on 11/07/18 at 12:27:46

The risk of it starting with the plug wire off is greatly diminished.

Title: Re: Engine Swap Troubles
Post by batman on 11/07/18 at 12:37:25

Jog I said testing OR starting. sealing the rings for compression and to prevent damaging the rings and cylinder in both cases.