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Thread: Z25 Gear and Shaft Replacement

  1. #81
    Senior Member Engenia's Avatar
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    Errol Kowald
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    Quote Originally Posted by SianeK View Post
    my battery is definitely good, it has 240amps inrush current
    240 is marginal for an 1130 when hot. 200 Amps won't turn over my 900 when hot.
    I thought about the aribox temperature sensor, if it could cause such a problem..
    Not likely
    My Z25 sprocket has no markings or engravers.
    Can you measure the outside diameter?
    You'll be on top of one tooth and between two on the other side, so not a true diameter. I could measure my old one to compare. The new one is definitely smaller diameter.
    hooroo, Errol www.engenia.com.au [136,351 km - and counting .....]

  2. #82
    Junior Member SianeK's Avatar
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    I will measure the diameter Z25 on the weekend
    so that the 1130 engine efficiently starts o hot engine what power should the battery be? 280A? maybe try to add an extra cable from the battery to the starter

    benelli 1130 is so beautiful that I can look at it when the engine cools down and drink coffee, but sometimes I do not have time
    Z25 Gear and Shaft Replacement-f430cdi.jpg

    my fanpage Benelli TNT 1130 https://www.facebook.com/sianeksgarage/

    To sum up, in order to remove the fault I need:
    z25 mod R300000081000
    Belville washer R310032007000

    Last edited by SianeK; 03-28-2019 at 08:40 AM.

  3. #83
    Junior Member SianeK's Avatar
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    Z25 Gear and Shaft Replacement-rdoldal.jpg
    Z25 Gear and Shaft Replacement-xnccqd2.jpg
    Z25 Gear and Shaft Replacement-g1aiscv.jpg

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  5. #84
    Senior Member Engenia's Avatar
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    Errol Kowald
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    Original Z25 Gear 'Diameter'

    A ruler is not going to cut it I'm thinking. You'll need a set of calipers :-

    It's a bit hard to hold the calipers in the right hand and take a picture on a right handed camera, but here it is ....
    Z25 Gear and Shaft Replacement-benelliz25original.jpg
    This is TaxTre's original Z25 gear, measured with the caliper touching two teeth on the left and one tooth on the right. As near as you can get to the outside diameter, it measures 76.35 mm.
    The new one is definitely less, but I don't know by how much. I'm guessing that it is in the 75's
    hooroo, Errol www.engenia.com.au [136,351 km - and counting .....]

  6. #85
    Junior Member SianeK's Avatar
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    Quote Originally Posted by Engenia View Post
    A ruler is not going to cut it I'm thinking. You'll need a set of calipers :-

    It's a bit hard to hold the calipers in the right hand and take a picture on a right handed camera, but here it is ....
    Click image for larger version. 

Name:	BenelliZ25original.JPG 
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    This is TaxTre's original Z25 gear, measured with the caliper touching two teeth on the left and one tooth on the right. As near as you can get to the outside diameter, it measures 76.35 mm.
    The new one is definitely less, but I don't know by how much. I'm guessing that it is in the 75's

    Thank you for making the old Z25 dimension
    if z25 is mounted it is very difficult to measure such a diameter, I have to disassemble it


    I also read that you can get to know the old and new type after finishing z25
    the new type is glossy smooth
    old type matte and rough, is it true?

    half the diameter of my z25 is 37.5 mm, so the total diameter is about 75mm

  7. #86
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    Quote Originally Posted by SianeK View Post
    Thank you for making the old Z25 dimension
    if z25 is mounted it is very difficult to measure such a diameter, I have to disassemble it


    I also read that you can get to know the old and new type after finishing z25
    the new type is glossy smooth
    old type matte and rough, is it true?

    half the diameter of my z25 is 37.5 mm, so the total diameter is about 75mm

    Generally the upgraded z25s have a smoother finish than the "cast" finish.

    I say generally as I had a newer smooth finish in my last trek which still suffered from the twisted spline shaft (hot start problem) . I just replaced it in time and the replacement z25 gear was identical to the failed one..

    In saying that though , it could have been the previous owner (dealer ) only replacing the gear and forgetting (conveniently) to omit fitting the new splined shaft which comes as part of the kit. With hindsight it was probably the latter which is why you should fit it yourself or ask for the old parts back if a dealer does the job.

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