Long block wont fire (swap to my other motor and it fires right up so its not elec)

[yamasaki760]

I'll take a pic tonight of the pickup coil and pulse generator removed so we can see that at TDC, the cam sprocket is at 12 o'clock and the "0" lined up with the index mark on the valve cover

[83ATC185]

Are the cam chain and guides new and properly tensioned?

[yamasaki760]

Are the cam chain and guides new and properly tensioned?

The cam chain and guides are not new. I reused both. They have the tensioner in the case. I do believe theyre tensioned properly? How do i check for proper tension?

[83ATC185]

you really cant set it until its running but those adjusters are bad for sticking in my experience, i'd just take the bolt out of the top and loosen the adjuster bolt and make sure the tensioner springs back as tight as it will go. The chain should be fairly tight.

I'd never rebuild a motor and reuse the timing chain or guides. There was a time we rebuilt a motor and didn't replace the oil pump, because it was still good at the time. You can guess what happened 6 months down the road.

[yamasaki760]

gotcha... agreed on all points.

however, besides philosophical objections :-) .. you think that could be the culprit? loose cam chain?

[83ATC185]

Maybe not too loose but stretched. It could be the reason you have to retard your timing so much to get it lined up. In my experience the chain will start slapping before it causes serious ignition timing problems. Nevertheless something to check.

Another thought i had and i know it sounds stupid, but is the dowel pin on the camshaft to locate the rotor? And has the CDI rotor itself ever been apart? The rotor will fit on the base both ways and can easily be reinstalled 180 out, athough now i see that isn't the case, because the dots line up on the rotor base and center.

[yamasaki760]

Another thought i had and i know it sounds stupid, but is the dowel pin on the camshaft to locate the rotor?

Oh my god. That is not a stupid question. Trust me.

This $1.00 part cost me like a month and a half on this build lol. I bought one, usps lost it, had to get another one ordered, lost about a month and a half between this and that in the whole ordeal lol.

The dowel pin is most definitely on there. I have nightmares about this dowel pin sometimes.

[yamasaki760]

So.. I put in a stock cam and now its lining up centered (vs full retard) at TDC.. I advanced the timing a touch..

I think this looks better .. still not sure why that other cam is lining up with the pickup coil at full retard..

maybe i'll swap the motor out next week after some trike fun this weekend.. i'm committed for the weekend at this point with the motor that's bolted in and tuned up to the 30mm carb in there now.

[yamasaki760]

I cleaned up the 200x after a nice weekend of riding.. pulled my spare motor out and put in this motor with the only change being i put the stock cam back in... she fired up on the first kick..

Can a cam get messed up? this is above my pay grade lol

[yamasaki760]

Alright maybe I'm not totally crazy after all.

I spoke to Mickey Dunlap yesterday and he confirmed my FST cam is bad. Apparently he got a bad batch of cams in from whoever he farms the work out to.

[83ATC185]

what exactly is wrong with them? can they be modified to work?

[yamasaki760]

what exactly is wrong with them? can they be modified to work?

That's a question for Mr Dunlap to answer.

All I know is he said he measured a bunch he had in stock and all but 1 were bad. He asked me to send mine back so it can be sent out, fixed, then sent back to me.

Thats the extent of the information I have at the moment.

[yamasaki760]

Dropped in a web 389a : http://www.webcamshafts.com/mobile/a...10_000085.html

She's running really good for a 200x.. I'm running a hi-comp piston and 100LL fuel

i can get the front wheel to come up easily while rolling in 2nd gear

cant get the wheel up on demand in 3rd though.. the 350s still got me beat in that dept.. :-)))