SRX600 Air Cleaner Cover

[northernmaplered]

Hi there! I am in the process of a second resurrection of an 86 SRX600 (1JK). It has been about 6 years since it last ran, and it has been in varying stages of disassembly since then - time/finance issues as well as being 1000+km from the bike have made the project a little difficult!

I removed the right-hand side cover recently to find out I was missing the rubber flap that goes in behind, as well as the cover that goes on the air cleaner case. Loads of cobwebs/debris/insect carcasses along with a completely toast air filter were found inside... I genuinely cannot recall if I ever even had the cover for the air cleaner case, and have had no luck asking my dad to look around his shop where I was last working on it several years ago.

I am located in Canada and can't find the part anywhere used (or 'new' as it's discontinued of course). Can anyone suggest a solution for closing up the air box if I can't find the original cover that may or may not have been on my bike? Is there any cover that comes to mind from other bikes that I could modify to make fit?

Part number: 14   1JK-14422-00-00   CAP, CLEANER CASE 2
Diagram: https://lh5.googleusercontent.com/-HNL3mg6BTZs/TmkbM5asQRI/AAAAAAAACFY/F0iSORHJ0IE/s800/plst_d7.jpg   (#14 in the top left corner)

Thank you in advance for any and all suggestions.

[mini-thumper]

If you're not intending to keep everything original maybe a set of after-market conical filters might be the answer - with appropriate jetting/dicking about. There may also be one of our many SRX owners who can supply a used part and/or give technical advice for fitting filters etc.

Never despair everything is possible via this little site.

Good Luck in your search/hunt

Boyd
PS were in Canada are you based?

[northernmaplered]

Thanks for your response Boyd!

I had been hoping to keep it as original as possible.. at least until I can get it running again - modifications may come later I also happen to have already purchased a new original style air filter, as I had thought I/my dad would find the cover piece around somewhere. Finding the part used would be ideal, but of course I am doing my best to stay realistic in regards to that happening If it were to come down to it, I'm not opposed to MacGyvering some other part to work, or even using my Dremel to make one (if I could get my hands on some measurements).

I am surprised it took me so long to sign-up on this forum! srx600.net has been an amazing resource and jump-off point in getting going on this project once again, but somehow it's taken me awhile to end up here.. I spent lots of time this morning just perusing and bookmarking threads.

I am based in Northeastern British Columbia.

-AJ

[themoudie]

Aye AJ,

Welcome to the '......... house'! 

I have been running a SRX600 1JK 'Sally' since ~2005, with no rubber sheets or the side cover into the air filter and so far no problems with standard carbs, a BSM 'Futura' aftermarket exhaust, iridium spark plug and a K&N air filter rather than the Yamaha OEM air filter. Image attached.

This is the filter on the K&N UK site as of today 10th August 2018, don't know what the exchange rate for the C$ to the GBP is like but maybe worth a look?

Link:Yamaha SRX600/400 1JK K&N air filter

DON'T excessively oil the filter!

If you want to make up a replica of the rubber sheets that fit behind the alloy side cover, then I suggest that you might use 1-ply Insertion rubber sheet, either 1.5mm or 2.0mm in thickness. Draw and cut out a card template, then trace around on the rubber sheet with a soft (2B) pencil and cut out with a good sharp pair of scissors. I don't have a template for the 1JK ones! 

I suspect that there is no need to emphasise the need for clean oil and oil filter and to be aware that 30 year old oil seals, especially in the oil pump, may not be as pliable as they once were.

SteveH, who's site 'SRX600.net' is, also looks after this site and occasionally comes in on site, as does SteveL, who has a rake of these beasties; Ian also has plenty of experience rebuilding them as well. If you keep the 'Bike Problems/Questions' board selected and then enter SRX into the 'Search' window in the top right of the board page, you will select a whole raft of problem solving, crying into workshop rags angst and pats on the back!    We may not have seen it yet, but there is a good chance we have.

If eBay cannot come up with the goods, then you may have to speak nicely to the Japanese community in Vancouver or go directly to 'Jauce', the Japanese equivilent to eBay, where all this stuff is obtainable, but may cost you!

You should also know that a lot of the Yamaha Raptor 600 snowmobile engine parts fit the SRX motor, I am running a Wiseco barrel 'Standard' (598cc) bore sleeve and piston in my 1JK motor for a Raptor.

Good health, Bill





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[northernmaplered]

Hello Bill! Thanks for the welcome!

May I ask why you chose to go with the K&N air filter rather than OEM? Did you take of the cover and flap intentionally? The fact that you have had no issues with no airbox cover/flap, combined with mine missing them both as well, gives me a sneaking suspicion that this may have been done intentionally by my past self....... If you are looking for a laugh, I've attached a GIF of what the air filter looked like exactly when I removed it from the bike - foam in sideways and all. I remembered that my dad and I had made a 'new' filter when we first rebuilt it 7 years ago Yikes...
LINK: https://media.giphy.com/media/1oCZ3W5EHUBSHTwAQk/giphy.gif

As you may have guessed, it wasn't exactly a well-financed nor rich in new parts build the last time, so I am crossing my fingers that we at least replaced as many crucial seals as possible. The gaps in my memory are proving to be a great example of why pot smoking and motorcycle assembly do not mix

I've quite enjoyed reading through all of the SRX6 threads in the Problems/Questions board! Makes me feel slightly less insane I must admit 

Thank you for the snowmobile tip, I had no idea! And of course thank you for your reply in it's entirety.

Unrelated to airboxes, while I was looking for the clip of the air filter on my computer I ran across this picture and figured I would ask before I forget again (see image). It's of the auto-decompression mechanism at the cylinder head - if I am not mistaken, I am missing a torsion spring here am I not?!? Getting back into this project has been a treasure hunt/mystery/puzzle that creates more questions the deeper I go hahahah
LINK: https://imgur.com/a/E6Xvr5V

All the best, AJ

[themoudie]

Aye AJ,

K&N air filter is known to work (Baja etc), doesn't need loads of maintenance and can be used in exposed conditions, whilst the OEM foam filter is designed to be replaced/maintained more regularly and to work in a controlled environment (air box), no water, less dust etc and disintergrates when fuel blow-back happens through the carbs; it gets worse with ethanol in the 'fuel' as the glues holding it together all dissolve!   Also allows air to flow more easily, rather than being constricted by the 'snorkel' on the side cover (see parts list).

Waccy baccy and .......... everyone to their own. 

As for your valve lifter spring conundrum, I attach an image of Sally's, make sure the cable is adjusted with only 2mm - 3mm free play once you have the bits.

Whilst I realise that you are in NE BC the following link to our main Yamaha spares dealer's (Fowlers) web site might prove helpful. Just be aware that increasingly parts are "No longer available", but many parts from later XT600 and XT600E can be substituted in the engine and running gear from the 1980's to 1990's FJ, FZ, FZR can be used as substitutes. By left clicking on the part number in the lists, the same part used on other Yamaha bike models is shown, which can be very handy. 

Fowler's_SRX600_1XL_parts_list_Canadian_prices

N.B. If you wish to change the CN$ prices shown, left click on the flag in the top menu bar and then select the country you require from the displayed list.

Note the spring required will no break the bank, but all the other 'fees' might!

Do you have a workshop manual? A PDF scan can be forwarded to your email address, if you care to leave it in my PM folder on this forum.

Hope this helps, Bill

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[northernmaplered]

Many thanks Bill!

It's sounding like the K&N may be my best option here, especially given the likelihood of finding a cover and the possibility I was having air flow issues before.. not bad price either to save myself the hassle ($99 CAD with shipping, almost the same as cost over your way).

Very helpful picture of Sally there and the link and tip on adjustment - I may have just solved a 6 year mystery! Fingers crossed anyhow. I'm sure I will be back soon with either good news or more questions 

I do have a workshop manual, it is in paper format though - a PDF copy would be very handy and much quicker to find what I need! I will send you my info asap.

Heaps of gratitude,
AJ

[Steve H]

The air box needs to be either cut to fit K+N filters, alternatively you could remove it but will need to fabricate part of the inner mudguard and a battery box.
I would just leave the cover off and fit a DynoJet to get it to run correctly. http://www.dynojet.com/pdf/4318.pdf

[themoudie]

Aye Steve,

I'm just using the flat direct replacement K&N filter, not pods, on Sally (SRX twin shock) and I have also fitted one into the SRX monoshocks airbox without any cutting. With the monoshock, I super glued velcro around the opening over which the air filter lies within the airbox and then super glued the velcro 'hooks' to the air filter base and it all fits in place with no cutting of the airbox.

I can take images for the website if you wish.

My regards, Bill

[Steve H]

Hi Bill, northernmaplered is missing the air filter cover. My comments were about separate pods which would need the box cutting.
Fitting a K+N panel filter still leaves the issue of the missing air filter cover and the resulting affect on fuel mixture, this can be corrected by a DynoJet kit. I ran mine like this for a number of years with just the Stage 1 DynoJet kit and it worked well.

[themoudie]

Aye Steve,

Agree with you Steve about the pods and my previous posted image (10/08/2018) is of the filter in Sally. Whether I fitted a Stage1 DynoJet kit in Sally, I cannot remember!    I think either Jim or I must of, as the wee box of tricks, minus jets and needle is sitting in a drawer!    Whether Jim had already fitted the kit, after removing the side cover, or I fitted it, I cannot remember! Like you say the set up works well as I have had the bike now for the best part of 15 years and the motor still seems to be running fine (famous last words). 

Good health, Bill

[northernmaplered]

Thank you Steve and Bill for your additional input. I will be looking into the aforementioned Dynojet kit today. Would you still recommend this kit with a stock-style air filter and the current lack of airbox cover? I understand it would be best to have the K&N filter but all I have at the moment is a new stock filter.

Thanks,
AJ

[themoudie]

Aye AJ,

If you do not fit the Stage 1 Dynojet kit, whilst having no airbox side cover on and running the OEM 'standard' foam filter, you will be running with a weaker mixture than intended. So, there is a potential to burn out valves or put a hole in the piston.

Also, whilst it doesn't really apply to us here in the UK, if you are at altitude in the Rockies or down in Fort St.John and do most of your riding at these elevations then some advice from the Yamaha 'Raptor' 600cc single dealers/owners would be a good way to get local relevant advice. If on the other hand you are up near Fort Nelson, then being about 1,500 feet above sea level means you could be similar to ourselves over here.

So afore splashing the cash on a Stage 1 Dyno jet kit, my advice would be to speak to some locals/skidoo racers. I hope this helps.

My regards, Bill

[northernmaplered]

That is very helpful, as always Bill. I will ask around locally.

Many thanks,
AJ

[Steve H]

Thank you Steve and Bill for your additional input. I will be looking into the aforementioned Dynojet kit today. Would you still recommend this kit with a stock-style air filter and the current lack of airbox cover? I understand it would be best to have the K&N filter but all I have at the moment is a new stock filter.

Thanks,
AJ

I suspect there is little difference between a K+N and a good quality standard paper filament. As Bill says either way if your side cover is missing it will run weak regardless of which filter to decide upon.