From:Jeff Roth
Subject:RE: RE: KJ tunning help Date:Mon May 14 09:01:19 2007
Response to:1550
Rob, has anyone found a source for Bosch FF4 points?

My K.J. got hard to start at the recent Texas road run. (Had to start push starting it -- great entertainment for the AMCA'ers). Got home and found the inside of the mag cap had lots of carbon/graphite dust coating the inside. Also found the points a little scored. Cleaned everything up and it starts well and runs smooth.

But the points have long since lost their tungsten coating or whatever that was. They'll foul again in time. Would like to put in a fresh set but don't know of a source.

Have already asked Gene H. and a guy on the web, Bill Lopoulos, to no avail. Any suggestions? See points pic.



Hi Pat,

One point I've had to correct in the past were cams which have lobes that are not in the right positions. After so many years some lobes are under slight tension and can twist. Its very difficult to correctly time and engine this way. Worn lobes and tappets make things more challenging.

Secondly, check your mag points and make sure that BOTH opening ramps on the mag will open the points the same gap amount on each revolution. The ring around the points have 2 ramps and can be worn. Those 2 ramps can be very different. If you set your ponts on one side of the opening ramp, spin the engine and check the other side. You can see that when the points spin if the ramps are different heights you will have 2 different gap settings. You will then need to correct the ramps.

Third, A intake manifold leak will give the impression of poor timing, hard to start, not run well. This is a very common problem and will frustrate you. Once you tighten your manifold down take a .002 feeler gauge and try to slip in in between the manifold and cylinder. Check all the way around the manifold snouts. Backsides 2 & 3 are hard to get at. If it can slip in anywhere, you have a leak.
You can't check this with the cylinders off as you can also have warpage at the crankcase. The proper fix of course was to machine the case then machine the tops of the cyinders. However, some manifolds have deeper cut seating surface.
Also check the bolt holes in the manifold. The casting is very thin there and occasionally there is a break in the inside wall due to poor castings or enlarged bolt holes, and you will suck air in that spot. Best solution is to actually plug up the manifold and leak test it.

Watch for gas dripping from the carb as well,
Sorry if I was long winded,

All the best,


hmmmmmmmm I have one that is interesting. I have a 1930 model KJ very nice bike went to start it the day before and she started on the fourth kick ran a few revolutions then saw a very nice orange blue color on the mag side of the motor as I looked at the very fine flame coming from around the mag the generator and the bottom of the motor stop to think well ?? should I take a picture of this fine site? I calmly walked to the other side of my shop where I yanked the fire extinguisher from the bench and dowsed the whole motor! after pondering what damage might be under the Yellow powder that turned to paste with the flow of gas from the busted fuel line I rolled the bike outside to air blow it off to my surprise no damage! although the tanks had a nice black film on them no damage to paint or anything... wow!
I replaced the old line and have never had a problem ever in my life like this. Keep in mind I like many others laugh at those weird guys you see with the fire extinguisher on the side of there bike! I even know of a friend that sat by the side of the road to watch his 38 inline Indian parish to flame. I even remember old Todd Bertrange coming back from Oregon with the two 31 Hendersons on the back of his worn out truck that caught fire as he watched it burn all to the ground a friend still has the aluminum puddle from the road where they had burned. I am wondering how all feel about the FIRE EXTINGUISHER? dose Howard Heilman make a leather cover that dose not detract from the bike?

Ok now my tech question.
I would like to talk with others on tuning the bike It seems I can never get it just right? my other machines run fine is there something I don't know? Is there anyone that will be at Hanford meet or Dixon that has a late one that can give me a lecture on what I just can not figure out?
I always welcome help ..
thanks pat