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73 DT3 rear shocks and spark plug questions.

  • Josgnal87
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Hey fellas I'm new here. I have a 73 DT3. It runs okay as long as I keep spark plugs on me. But my question is can I achieve a taller bike if I put longer shocks on the back? What are my options and limits. What should I look out for? Like chain rubbing and the like. My other question is plug fouling. I go through plugs like a freaking mad man. I was running the injection pump which I tested and set by the book. I disabled that and run 32:1 premix with hopes it would fix the fouling. No change. I'm waiting on a carb kit in the mail. 
12 Aug 2022 19:13 #1

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Replied by 1971DT250 on topic 73 DT3 rear shocks and spark plug questions.

The longer shocks from Redwing and Assault will likely interfere with the chain. I have KM-S340 which are 3/4 inch longer on my RT3 but the rear sprocket on the RT3 is 39 tooth. The DT3 has a 44 tooth. Pirelli MT43 tires have a taller profile, I have them on my RT3. The seat height increased by about an inch and a half. I lengthened the kickstand by 1 inch.

I've had bad ignition coils cause excessive spark plug use.

The oil pump on these is a very good reliable design. Forum member DEET rebuilds them.

Most of the carb kits have inferior brass parts. The gaskets and o-rings might be OK. Use genuine Mikuni in unopened packages from a reputable source like jetsrus or sudco.
The hours spent riding my Enduros is not deducted from my life span.
Last edit: 13 Aug 2022 05:03 by 1971DT250.
13 Aug 2022 04:59 #2

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  • Josgnal87
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Replied by Josgnal87 on topic 73 DT3 rear shocks and spark plug questions.

Okay. I was reading about those shocks in another post here. So it is as I expected. I know what to look for then. 

My carb kit came from niche cycle. I'll look into those kits you suggested.

My ignition coil is good. I am within tolerance on the primary and secondary side. I don't remember my exact reading but it was .6 and 6000 range.

As far as the injection pump goes, I tested it and it works to spec. I only disabled it because I have lucas semi synthetic in the tank and I wanted to try mixing a standard non synthetic oil to see if my fouling was due to running synthetic oil.
 
13 Aug 2022 05:25 #3

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Niche should be genuine I use there kits also on my Ct1c I used RD350 shocks which cleared the chain guard my son is 6’ 5” tall for a little extra height. To me it   Doesn’t look out of place nobody else noticed either 
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13 Aug 2022 06:12 #4

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Replied by 1971DT250 on topic 73 DT3 rear shocks and spark plug questions.

Can you post a picture of the shocks installed on the bike?
The hours spent riding my Enduros is not deducted from my life span.
Last edit: 13 Aug 2022 07:37 by 1971DT250.
13 Aug 2022 07:37 #5

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Yes it will probably be tomorrow 
13 Aug 2022 14:54 #6

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  Here are a couple of pictures the Ct1c with 1” longer shocks the kickstand is stock everything clears the chain and guard. I know the color is not correct but I painted it Schwinn stingray Coppertone to match my bicycle. 
14 Aug 2022 13:25 #7

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14 Aug 2022 13:27 #8

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