[Oliversb]

Hi,

I just bought a Trek 2008 and i have this strange issue sometimes when starting or shutting down engine i hear this hard hit... anyone have a clue what can it be? One more question, where can i get a obd cable for my trek any suggestions?

thanks

 

[StingerWolf]

Maybe you starter motor is damaged.

Obd cable dont work with trek.

If you have a walbro ecu you need a rs232 cable kit have a look at tuneecu.com there are infos how make a cable kit or buy one.

There are 2 versions out there

1. rs232 kabel with adapter (sometimes connections is a little unstable)

2. Usb/amp cable kit (better solution)

If you want a set let me know I sell them if wanted.

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[Oliversb]

Maybe you starter motor is damaged.

Obd cable dont work with trek.

If you have a walbro ecu you need a rs232 cable kit have a look at tuneecu.com there are infos how make a cable kit or buy one.

There are 2 versions out there

1. rs232 kabel with adapter (sometimes connections is a little unstable)

2. Usb/amp cable kit (better solution)

If you want a set let me know I sell them if wanted.

Gesendet von meinem SM-P905 mit Tapatalk

thx for info... yes im intrested i buying cable... you can send my message with price and details... all i need to do is check is my ecu i walbro... Also i see that you are in Munich i have a friend there who could pick it up and send it to me in croatia...

 

[StingerWolf]

Details sent

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[Laso]

Hi,

I just bought a Trek 2008 and i have this strange issue sometimes when starting or shutting down engine i hear this hard hit... anyone have a clue what can it be? One more question, where can i get a obd cable for my trek any suggestions?

thanks

Hi,have you fix the problem with kick? it looks i have the same problem... THX

 

[Engenia]

i have this strange issue sometimes when starting or shutting down engine i hear this hard hit..

Same thing sometimes happens with my Tornado, but only at shutdown. It depends where in the cycle the crank stops. There are three (I think) natural resting points dependant on the cam lobes. If it stops between them, the crank will then rapidly move to one. If it means going backwards, it will, and that's where the clunk comes from. The cam chain is running backwards and not held tight by the crank.

That's my theory. I may be wrong..

 

[Sprocket]

My Tre-K makes the same "Clack" noise occasionally. I figured it was the cam chain slapping against something, so nothing to be too concerned about.

 

[Rick67]

Yes same noise happens occasionally on my bike . I'd put the noise down to the engine reversing back slightly at shutdown and maybe moving the sprag clutch a little . Freaks me out lol. Pulling the clutch in on shutdown helps I found

 

[nickaprilia]

Yes same noise happens occasionally on my bike . I'd put the noise down to the engine reversing back slightly at shutdown and maybe moving the sprag clutch a little . Freaks me out lol. Pulling the clutch in on shutdown helps I found

I think it is this trait that causes z25 / clutch retaining nut to loosen and alternator rubbers to disintegrate.......any opinions?

 

[Sprocket]

Could be. My Z25 shaft had a twist in it that I reckon was caused by the engine kicking back against the starter clutch, either during a failed start or when shutting down.

 

[Salcito Marco]

#metoo

 

[Desmodude]

It's the sprag clutch.
Not that hard to swap but you need to remove the z25 gear, and to do that you need to remove the clutch.

On my sprag all of the bolts were loose so it's vital to do this before anything goes fubar.

I would recomend anyone doing the z25 check or swap the Sprag clutch and visa versa.

I'll see if i find the picks of my Sprag when i swapped it.

 

[Desmodude]

 

[Desmodude]

For me ut was the 6 bolts here that were loose (unscrewed by them self) so the assembly kicked against a sprocket and worned out the sprag.
It will only get worse over time.
Use proper licktite and correct nm.

 

[Desmodude]

It probably happend caused by the failed z25 and that the rod was twisted.

 

[Salcito Marco]

It probably happend caused by the failed z25 and that the rod was twisted.

How old is your trek, did they not upgrade the locking washer on later models

 

[Desmodude]

Mine is an 2008.
The washer doesn't aply to the issue with the sprag per se.
Not really sure if the washer at the z25 were swapped on mine before.
New one now though

 

[Salcito Marco]

I see alibaba etc are doing the sprag kits very cheap, i know it's a pattern part but there's a lot of benelli in asia, what do you think, would you fit one, by the sounds of it they can't be worse than the original parts.

 

[Desmodude]

I wouldn't buy vital parts on Alibaba or similar.
I'd buy them from renown shops like Bennet's and Maniac Motors.
If you pop Alex at Maniac a mail he will tell you what you need down to the last washer.

I buy a ton of stash from China, some parts are great like brake and clutch levers etc, but i don't buy brake parts, shocks, steering dampers and so on.
Could be ok, but i wouldn't risk it.

 

[Salcito Marco]

How can you know those parts were not originally sourced from china/Taiwan. Most bearings and accompanied parts are mostly made there nowadays. Benelli itself was bought by the Chinese, don't tell me that the Chinese paid 4x as much for the italians to make bearings and rollers to put in their engines when they have their own.