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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tank mounting misalignment
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<blockquote data-quote="davidd" data-source="post: 54513" data-attributes="member: 1177"><p>Bill,</p><p></p><p>Well, you are correct. What I was finding was the portion in the head lug and the portion that contained the side car lug mount were not in line with the portion that contained the steering stem. If you put the steering head in a vice and clamped on the gas tank mounts you could see that the tail was twisted. </p><p>[ATTACH=full]2839[/ATTACH]</p><p></p><p>You can see that the last two oil tank mount holes are directly over the side car mount.</p><p></p><p>The fit of the FT4 in the oil tank is pretty close. The oil tank, being sheet metal, may vary somewhat, but it it is a little wide it just closes down when bolted. The oil tank mount holes appear to be reamed to size and I suspect the factory did not want you fooling around with the fit. Smaller bolts could be quite exciting.</p><p></p><p>The one in the photo is an inny. If I remember correctly there are two types of outies. There is one with a boxy cross section, which I think Ron has and one with a recessed cross section like the one above, but with the motor mount cast in as an outy. I think Tim has one ons his GFR. The inny is much easier to machine the one in the photo as it is compact and the other side of the motor mount is in the same plane as oil tank mounting holes.</p><p></p><p>What I did was put a 7/8 X 3' ground rod through the steering stem. I then laid the ground rods on two V-blocks, on on each side of the steering head. As the axis of the steering head was parallel to the milling table I put a spacer under the the rear most oil mount hole and took a skim cut off the top. I then flipped the steering head over in the V-blocks and did the same to the other side. I did this a few times until I could use the same spacer under either side and the mounting surface was parallel on both sides. I could then mill it to dimension. Ron has the problem that he is already at dimension and he has the giant claw on the back to grab the head lug, but there are solutions.</p><p>[ATTACH=full]2840[/ATTACH]</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 54513, member: 1177"] Bill, Well, you are correct. What I was finding was the portion in the head lug and the portion that contained the side car lug mount were not in line with the portion that contained the steering stem. If you put the steering head in a vice and clamped on the gas tank mounts you could see that the tail was twisted. [ATTACH=full]2839[/ATTACH] You can see that the last two oil tank mount holes are directly over the side car mount. The fit of the FT4 in the oil tank is pretty close. The oil tank, being sheet metal, may vary somewhat, but it it is a little wide it just closes down when bolted. The oil tank mount holes appear to be reamed to size and I suspect the factory did not want you fooling around with the fit. Smaller bolts could be quite exciting. The one in the photo is an inny. If I remember correctly there are two types of outies. There is one with a boxy cross section, which I think Ron has and one with a recessed cross section like the one above, but with the motor mount cast in as an outy. I think Tim has one ons his GFR. The inny is much easier to machine the one in the photo as it is compact and the other side of the motor mount is in the same plane as oil tank mounting holes. What I did was put a 7/8 X 3' ground rod through the steering stem. I then laid the ground rods on two V-blocks, on on each side of the steering head. As the axis of the steering head was parallel to the milling table I put a spacer under the the rear most oil mount hole and took a skim cut off the top. I then flipped the steering head over in the V-blocks and did the same to the other side. I did this a few times until I could use the same spacer under either side and the mounting surface was parallel on both sides. I could then mill it to dimension. Ron has the problem that he is already at dimension and he has the giant claw on the back to grab the head lug, but there are solutions. [ATTACH=full]2840[/ATTACH] David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tank mounting misalignment
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