YPVS Loses Position(?)

[2steve]

Toomey pipes and Toomey jetting. Really ran fine until about May.

[automan]

I am not familiar with Toomey, but do they have internal baffle(s)?

Wirges for Kaw H1's were notorious for breaking baffles and flopping around at different positions at certain RPM's.

This is why I ask.

cliff

[m in sc]

oh, no nothing like the wirges 'washer'. im very familiar w those.  these,are straight thru. like dencos.

[SoCal250]

Really ran fine until about May.

What changes, mods, or maintenance was done in the time immediately preceding this?

[automan]

oh, no nothing like the wirges 'washer'. im very familiar w those.  these,are straight thru. like dencos.

Ok, scratch that.

Thanx!

[teazer]

Going back to the first post in May, one needle was replaced and the tank was sealed.  Did either of you check the needle dimensions and compare those to stock or the the needle that wasn't changed (or the one that was)?

[2steve]

I did measure them to compare with higher quality calipers.
They were really close to each other at the tip, midway and near the top, plus overall length.

That still doesn't explain why I'm running the highway or interstate in the good rpm range and it slowly winds down to a crawl or completely stops

If it does come to a stop, it will kick back to life like nothing happened. This behavior started the bowls-running-dry theory that has been disproven and appears electrical in nature.

[1976RD400C]

How about trying to gap the plugs smaller and then see if that changes or stops the highway slow down problem?

[2steve]

Since the initial problem, plugs have been changed twice. Mark popped in some B9's and then I've tried B9EIX. These have been pre-gapped according to the middle of the RD400 range. Haven't tried to narrow the gap.
Every time the highway failure has happened, it has been very sketchy. No shoulder/busy road at night or interstate with orange barrels narrowing the the shoulder. It's hard to be excited about trying that out again.

[m in sc]

I gapped the ones i put in at like .025" or so.

[1976RD400C]

If you are at your wits end    and still think it could be carbs I can let you try my stock carbs as long as you treat them like a newborn baby, don't alter them in any way, and promise me I get them back right away with insurance on the package. They work good, real good. 

[2steve]

I might take you up on that. But still trying to find an electrical smoking gun because of the shut down situation.

Correctly repositioned the new coil, in process of running another ground, etc.

Thanks!

[m in sc]

my 0.02. id definitely try it to rule it out as a possibility. if none of that works it reconsider a new harness (and use correct Japanese style connectors )

[automan]

Just like dr. house

[2steve]

Just like dr. house

Yessir! Exactly. Been thinking just that for quite awhile now.

I'm still waiting for someone to make that offhand comment that turns the light bulb on and I grab the cane and limp to the garage to fix it.

Usually happens within 45 minutes on a House episode. So far, nobody is calling me an ass yet.