I need helpGasGas FSR 2008 450 here

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Panaxil

New member
Hello guys , I am going straight to the point , I have my beauty the GasGas Fsr 2008 and i have a serious problem finding two parts .
I live in greece I already did everything I could to find it in the official dealer also with zero results.
I am looking for MFS450626550 & MFS400126020 if anyone could help with some information where to look I would appreciate it
Sincrely thank you
Panagiotis

Keep it braap’
 
I have never seen this part, but here is my suggestion:
When I look at the parts book I see that part number 21 seems to consist of two parts; a sprag clutch (one-way bearing) and a ring that in some way holds this sprag clutch. My guess is that the sprag clutch is a industry standard part while the ring is made for GasGas.

Is the problem that the sprag clutch slips, and the starter does not rotate the crankshaft? In that case I would try to find the sprag clutch only. The ring can most likely be reused.
I don't have a part number for that sprag clutch, but if you extract it from the ring and do some measurements, I guess a well assorted local bearing supplier should be able to find someting in one of his SKF, FAG, INA or similar suppliers' catalog.

Or, if international on-line shpping is your thing, take a look here (after doing your measurements):
Simply bearings
 
For MFS450626550 the cheap fix could be this from a post i made a couple years ago:

I knew my starter clutch was slipping but even from ringspann it is quite expensive. I found a starter clutch with similar dimensions and teeth count on aliexpress. The part number for it is FWD331808BRB. Right now it is on ebay for ~8 EUR/USD. You will need to use your old starter clutch cage and put the teeth from this new starter clutch in there. The new spring is also a nice extra. The sprags are the same size and the amount is also correct. There are plenty of videos on youtube where you can see people rebuilding/replacing the spring on these and it was easy to make a working starter clutch. Just make sure the teeth go in the right way. In my case both the new and old starter clutch had arrows on them so it was easy.

FWD331808BRB bearing cage is different but the wear parts inside will work with your gas gas cage if it is not damaged. Just by replacing the metal "dogs" or "teeth" I was able to fix my starter clutch issues. This fix lasted me ~4 years and at that point the spring had become loose. With these 4 years some wear happened on the teeth too but replacing the spring made it work until winter. I already have a new FWD331808BRB waiting and I will do this exact process again before spring to make my starter clutch new again. This should be a really cheap alternative fix for MFS450626550.
in this video you can see the spring replacement but my fix takes it one step further and you replace the parts that are kept in place by the spring.
 
So guys here I am !!
Thank you for your answers and information you share with me !
I took it out and the sprag clutch immediately broke in pieces so it was impossible to measure it right..
After a lot of search for the part and no results because of the unavailability of stock , I found the sprag clutch (one way bearing) as after market product on ebay for 75€ (shipping included ) (if you want I could update the link)
I am going to replace for sure this (not the ring that hold the part together with flywheel)and also the other bearing ..
Thank you for your immediate responses and explanations I appreciate that
Best regards
Panagiotis
 
Last edited:
Panaxil said:
Hello there , I am curious to know how you knew the right measurements for MFS400126020!! Is there any catalogue/manual that share information like this?
Best regards
Panagiotis
Click to expand...
You can usually find the part dimensions for bearings etc in the parts diagrams for your bike. Sometimes they will have the bearing code that you can search in google to find the dimensions. I have also replaced the starter bearing you are probably asking about and I got my part from aliexpress using the dimensions. You can find the parts diagram probably on this forum, on google or from here: https://www.enduropuro.it/shop/en/78-enduro-4t
Panaxil said:
So guys here I am !!
Thank you for your answers and information you share with me !
I took it out and the sprag clutch immediately broke in pieces so it was impossible to measure it right..
After a lot of search for the part and no results because of the unavailability of stock , I found the sprag clutch (one way bearing) as after market product on ebay for 75€ (shipping included ) (if you want I could update the link)
I am going to replace for sure this (not the ring that hold the part together with flywheel)and also the other bearing ..
Thank you for your immediate responses and explanations I appreciate that
Best regards
Panagiotis
Click to expand...
The one way clutch will come apart and you want it to come apart. You do not have to measure your part. Using the "teeth" and spring from FWD331808BRB part is a valid fix and will work. Alternatively the spring can be obtained from a cheap ~45-48mm ID oil seal. I have done this on 2 different Gas Gas 450 engines with 100% success. I even have a spare FWD331808BRB on my shelf in case the starter clutch wears out. The repair process is shown on the video i posted before. You just have to be sure to put the new teeth in the same way they were when you took the one way clutch apart. I can post pictures if needed.
 
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