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Type: Posts; User: daveb

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  1. Replies
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    I recently put VHM pistons in my 1989 reverse...

    I recently put VHM pistons in my 1989 reverse cylinder TZ250. The pistons were put in good used cylinders at .003 inch which is a tiny bit more than .07mm.

    I ran the bike in my shop for three...
  2. Thread: TZ350 for sale

    by daveb
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    There is a discussion of this bike on two stroke...

    There is a discussion of this bike on two stroke world (forum). It may be an accumulation of various parts.
  3. Thread: TZ350 for sale

    by daveb
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    TZ350 for sale

    I thought this community would want to know. There is a 1973 TZ350 on eBay. It looks like the real thing. Bidding ends tomorrow (5/21) evening. I have no knowledge of the bike.
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    Mike thanks for posting that video! I have seen...

    Mike thanks for posting that video! I have seen Marks videos on youtube but seeing #73 TZ in the video is even better. Is Marks' hybrid an Aprilia with a modified RZ350 engine?

    Edit: I get it now,...
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    Several so far! :) What else runs "open two...

    Several so far! :)

    What else runs "open two stroke".
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    How many TZ250s are in use?

    Since there are some long time 250 real GP bike riders on this forum, I was wondering if anyone had a feeling for this.

    How many TZ250s are there that are actually being raced in the US?
    How many...
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    Thank you for the information and caution on the...

    Thank you for the information and caution on the RZ. I have put newer brakes and wheels on it along with a steering damper. It still has the original forks. I have not ridden it on a track yet.

    I...
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    Yes, I have been racing the TZ in WERA vintage...

    Yes, I have been racing the TZ in WERA vintage and having a blast!! I have had it to Road Atlanta, Mid Ohio, Barber and others.

    I also picked up an FZR600 to run in vintage classes so I don't put...
  9. Thread: Piston Clearance

    by daveb
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    Piston Clearance

    What kind of piston to cylinder clearance should I consider maximum on my TZ250 reverse cylinder bike. OK,OK the manual calls for a range of .0018 to .0022 inch. An experienced tz tuner recently told...
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    Long downhill with throttle off.

    I recently ran my reverse cylinder bike at Road Atlanta. What a blast!

    On the long back straight we get going pretty fast and then the track goes down hill. I'm not ready yet to hold it wide open...
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    Rotax kart for sale.

    I saw on ebay a Rotax inline twin powered superkart for sale for $3100. If I had the spare money I would buy it just for the GP engine!

    Its in the other vehicle race car section.
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    A short update. I took this reverse cylinder bike...

    A short update. I took this reverse cylinder bike to another track day then to a WERA race that included vintage. What a blast.

    This was my first road race. To anyone contemplating it, GO FOR IT!
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    Thank you!

    Thank you!
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    Float level and jetting

    I have a 1989 reverse cylinder TZ250. In general my question is: does changing the float level require a jetting change?

    There is some excellent discussions that touch on this subject but I am...
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    The detonation ring information explains why the...

    The detonation ring information explains why the cylinders on my bike have a discolored area at the top. I have also noticed that pictures of used cylinders have this discolored area.
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    Excellent!

    Excellent!
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    So what is a det ring? Is it ok to have one with...

    So what is a det ring? Is it ok to have one with and one cylinder without on the same bike? Are the pistons the same for all three years of the reverse cylinder bike?

    I'm the question man....
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    Twc, I sent you a PM.

    Twc, I sent you a PM.
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    I was in your situation not long ago. I bought a...

    I was in your situation not long ago. I bought a reverse cylinder TZ250 and received excellent help here to get it set back up after a few years of non use. I have now taken it to two track days and...
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    Yes, I am interested. Are they 1989 W cylinders?...

    Yes, I am interested. Are they 1989 W cylinders? I think there were even differences in the three years of reverse cylinder bikes. Who plated them?

    defiant900, thank you for the help you have been...
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    TZ250 cylinder plating

    Its time to freshen my TZ250 reverse cylinder bike.

    I don't see any recent comments here as to who to use to re-plate the cylinders. I am most interested in quality and getting the clearance...
  22. Thread: 90 TZ250A SPark

    by daveb
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    You've probably already done this but make sure...

    You've probably already done this but make sure your old power valve batteries are holding a good charge. Another possibility are spark plug cap resistors gone bad.
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    Thanks for the input guys! I have had many two...

    Thanks for the input guys! I have had many two strokes apart but never one of these so the specifics are appreciated. I'm having a blast riding it and even enjoy working on it.
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    TZ250 head sealing

    My bike is a 1989 TZ250 reverse cylinder bike. I have the top end apart for inspection. I see the cylinder to head interface has no gasket but only two O-rings. The outer O-ring is for sealing the...
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    1988 to 1990 TZ250 seat wanted

    Any condition seat/tail fiberglass (or plastic?) section wanted for 1988 to 1990 TZ250, reverse cylinder. I will be modifying it so rough condition is OK.

    If you have something under you bench or...
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