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Chased an intermittent spark issue on my '75 HS.

Bryan keep it. One becomes two, then three and then four. I sold my first Penton to Donny Smith years ago and still regret it.

Thanks Mike.

I have a '74.5 enduro pipe I just removed when I put an Ace on mine. I don't know what it's worth so you could make an offer. My e-mail is [email protected].

PM sent

Davenport, FL

Just a thought... has anyone tried a Keihin PWK?

I have a complete, unassembled '76 engine. I will cc the head and compare it to my spare '75 engine when I get back to FL.

Brian I will have this bike at Perry.

Has there been '74 models with the 32mm forks and a black engine?

Ensure that your bead is in the recessed area of the rim, where the spokes are. That makes the last 1/3rd easier to go on.

I seized my '73 Jackpiner in practice on Saturday. I haven't had a chance to tear it down to check the damage and will do so shortly.

Can someone steer me towards a good engine builder who is familiar with these engines. If I have to bore it I will go ahead and have it ported. Not that I need more power.

I have a '75 400 that is frame #54 503 83007 and engine #5 5502242. From what I have read on here, the engines starting at 2808 had weights to tame down power delivery. I have a spare engine that is #6 5503136.

My question, is the weights heavier counterweights or added weight to the end of the crank? Would I be better off just exchanging the complete bottom end or changing the crankshaft?

Either way, I will be sending the head off to have the Carl Cranke mod performed on it.

I am looking for a mx tank for a '74 Jackpiner.

Ok I must be dense or something. I have read thru the production year guide and still confused.

I have a Jackpiner with a black engine, engine #52 36004010 and frame #54 40372572. It has the small mx tank with leather strap, the forks are 32mm. The frame has two upper shock mounts and the swingarm has five. The rear hub is a conical and the clutch cover is the rounded style that contours to the clutch.